Patents Issued in May 31, 2007
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Publication number: 20070121743Abstract: Methods and systems for Ubiquitous coverage OFDM hybrid point to multipoint communication system, including the steps of: determining transmission synchronization and bandwidth allocation between a first wireless client and a second wireless client communicating via a common wireless communication channel, by using a wireless point to multi point centralized synchronizing communication controller; transmitting to the air a download multi carrier transmission, via the common wireless communication channel using a first wireless frequency, wherein the download multi carrier transmission comprises the determined transmission synchronization and bandwidth allocation; receiving the download multi carrier transmission by a first hybrid converter and by a second hybrid converter; shifting the frequency of the download multi carrier transmission from the first wireless frequency to a second wireless frequency in the first hybrid converter and in the second hybrid converter; and transmitting the frequency-shifted downType: ApplicationFiled: November 22, 2006Publication date: May 31, 2007Applicant: Go Networks, Inc.Inventors: Gal Zuckerman, Oz Leave, Roy Kinamon
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Publication number: 20070121744Abstract: Methods and systems for hybrid point to multipoint communication systems, including the steps of: determining transmission synchronization and bandwidth allocation between a first wireless client and a second wireless client communicating via a common communication channel; transmitting a download multi carrier transmission, via a shared signal wired distribution line, wherein the download multi carrier transmission comprises the determined transmission synchronization and bandwidth allocation; receiving the download multi carrier transmission by a first hybrid converter and by a second hybrid converter connected to the shared signal wired distribution line; shifting the frequency of the download multi carrier transmission from a wired distribution line frequency to a wireless frequency in the first hybrid converter and in the second hybrid converter; and transmitting the frequency-shifted download multi carrier transmission to the air from the first hybrid converter and from the second hybrid converter.Type: ApplicationFiled: November 22, 2006Publication date: May 31, 2007Applicant: Go Networks, Inc.Inventors: Gal Zuckerman, Oz Leave, Roy Kinamon
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Publication number: 20070121745Abstract: Methods and systems for filtering and enhancing the uplink reception sensitivity of OFDMA hybrid point to multipoint communication systems, including the steps of: determining transmission synchronization and bandwidth allocation for a plurality of wireless clients; communicating with the wireless clients via a plurality of hybrid converters connected to a shared signal distribution line, by using a wireless point to multi point centralized synchronizing communication controller and an OFDMA modulation; receiving wireless upload transmission by using the hybrid converters; and blocking non-information carrying sub-carriers, received by at least one of the hybrid converters, before superpositioning the received wireless upload transmissions on the shared signal distribution line.Type: ApplicationFiled: November 22, 2006Publication date: May 31, 2007Applicant: Go Networks, Inc.Inventors: Gal Zuckerman, Oz Leave, Roy Kinamon
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Publication number: 20070121746Abstract: A low-complexity dynamic channel allocation apparatus and method in a multi-carrier communication system are provided. In the low-complexity dynamic channel allocation method, subcarriers are initially allocated to total users and two users are selected from among all possible cases of two users out of the total users. The power gain of each of the subcarriers initially allocated to the selected two users is calculated, which can be generated by reallocating each subcarrier to the other user through subcarrier swapping. The power gains of the initially allocated subcarriers are ordered for each of the selected users and a pair of subcarriers with the greatest power gains for the two users are selected. Subcarriers are reallocated to the two users by swapping the selected subcarriers between the two users.Type: ApplicationFiled: November 28, 2006Publication date: May 31, 2007Applicants: SAMSUNG ELECTRONICS CO., LTD., Industry-Academic Cooperation Foundation, Yonsei UniversityInventors: Myeon-Kyun Cho, Jong-Hyeuk Lee, Jong-Hyung Kwun, Woo-Hyun Seo, Daesik Hong
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Publication number: 20070121747Abstract: Data is transferred in a wireless communication system, such as a wireless spread spectrum communication system. A plurality of transmitting antennas are provided. Data is encoded to produce a plurality of data streams for each of the plurality of codes. The plurality of data streams are spread with the plurality of spreading codes, and for each transmitting antenna, one of the spread data streams of each code together is combined to produce a spread data vector. Each transmitting antenna transmits its spread data vector. The transmitted spread data vectors are received by each of a plurality of receiving antennas as a received version, and the data is recovered using the received versions.Type: ApplicationFiled: January 26, 2007Publication date: May 31, 2007Applicant: InterDigital Technology CorporationInventor: Ariela Zeira
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Publication number: 20070121748Abstract: A digital broadcast transmitting/receiving system, and a signal processing method thereof, includes a randomizer for randomizing a transport stream into a specified position of which stuff bytes are inserted, a stuff-byte exchanger for replacing the stuff bytes included in data output from the randomizer with specified known data, an RS encoder for performing an RS-encoding of data output from the stuff-byte exchanger, an interleaver for interleaving data output from the RS encoder, a trellis encoder for performing a trellis encoding of data output from the interleaver, an RS parity generator for generating a parity by performing an RS encoding of data output from the RS encoder, and outputting the generated parity to the trellis encoder, and a modulator/RF converter for modulating data output from the trellis encoder and performing an RF up-converting of the modulated data.Type: ApplicationFiled: June 27, 2006Publication date: May 31, 2007Applicant: Samsung Electronics Co., Ltd.Inventors: Eui-jun Park, Yong-sik Kwon, Joon-soo Kim, Jung-pil Yu, Jin-hee Jeong, Kum-ran Ji, Jong-hun Kim
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Publication number: 20070121749Abstract: A training sequence is pre-filtered in a radiocommunication system having an emitter in the form of an antenna device with several antenna systems, thereby making it possible to transmit the training sequences through a pre-filter to said antenna systems side for reradiation by the emitter. Estimation enabling to form the properties of radio transmission channels described by spatial correlations is formed. Said prefilter is dimensioned according to said correlations, thereby minimizing the error value of an algorithm used for estimation the channel on a reception side.Type: ApplicationFiled: July 8, 2004Publication date: May 31, 2007Inventors: Thomas Frey, Mario Kiessling, Markus Reinhardt, Ingo Viering
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Publication number: 20070121750Abstract: In a transfer apparatus to which MIMO-OFDM is applied, a data transmission method and a data reception method are provided in which, even when there are frequency errors varying among transfer paths, the precision of estimation of an inverse propagation coefficient function can be improved, thereby making it possible to suppress a degradation in characteristics. Among symbols composed of a plurality of subcarriers orthognal to each other, the transfer apparatus uses, as a synchronization symbol, a symbol in which predetermined amplitudes and phases are assigned to a plurality of subcarriers spaced at predetermined frequency intervals. The synchronization symbol is divided into transmission antennas to generate a plurality of synchronization subsymbols, which are in turn simultaneously transmitted from a plurality of transmission antennas.Type: ApplicationFiled: March 9, 2005Publication date: May 31, 2007Inventors: Naganori Shirakata, Yasuo Harada, Koichiro Tanaka, Tomohiro Kimura, Shuya Hosokawa, Yoshio Urabe
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Publication number: 20070121751Abstract: Embodiments of methods and apparatus for beamforming training symbols in wireless multiple-input-multiple-output systems are generally described herein. Other embodiments may be described and claimed.Type: ApplicationFiled: June 9, 2005Publication date: May 31, 2007Inventors: Qinghua Li, Xintian Lin
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Publication number: 20070121752Abstract: In a wireless receiving apparatus, comprising a plurality of antennas and a plurality of receivers each of which is provided for each antenna, each receiver uses a received signal that was received by the receiving antenna that is connected to it, and received signals that were received by the other receiving antennas, to calculate probability of a signal that was transmitted from a specified transmitter, and judges the signal that was transmitted from the transmitter based on that probability. The receivers calculate the probability using an equation that calculates the probability based on the posteriori probability that the signal transmitted from the transmitter is +1, and the posteriori probability that the signal transmitted from the transmitter is ?1.Type: ApplicationFiled: February 27, 2006Publication date: May 31, 2007Inventor: Alexander Lozhkin
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Publication number: 20070121753Abstract: In a lattice-reduction-aided receiver based wireless communications system, soft estimates of transmitted bit values are determined from a received signal by applying lattice reduction to the channel estimate and equalising the received signal in accordance with the reduced basis channel, and determining probabilities of transmitted bits having particular values by selecting a set of candidate vectors in the reduced basis, determining a corresponding transmitted symbol vector for each candidate vector and, on the basis of the received signal determining the probability of each transmitted bit value having been transmitted.Type: ApplicationFiled: September 5, 2006Publication date: May 31, 2007Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Darren MCNAMARA, Andrew LILLIE
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Publication number: 20070121754Abstract: The disclosed embodiments relate to a digital radio frequency (RF) circuit that creates a signal in a desired range in a frequency spectrum. The RF circuit comprises circuitry that produces a first sample data modulated signal having a first frequency and a first sample data clock rate. An up-sampler modulator receives the first sample data modulated signal and produces a second sample data modulated signal having a second frequency and a second sample data clock rate. The RF circuit may also comprise circuitry that receives the first sample data modulated signal and the second sample data modulated signal and delivers one of the first sample data modulated signal and the second sample data modulated signal for further processing depending on which sample data modulated signal exhibits desirable characteristics for a given operating environment.Type: ApplicationFiled: September 25, 2003Publication date: May 31, 2007Inventor: David Mcneely
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Publication number: 20070121755Abstract: In a data communication system, a transmitter of a modem, for example, uses a single scrambler to operate in a data communication mode and in a non-data mode. During the data communication mode the scrambler is used to scramble data for communication by the transmitter. During the non-data mode, the scrambler is used to generate a non-data mode signal for communication by the scrambler. The modem may be an ADSL modem, for example, in which case the data communication mode is SHOWTIME while the non-data mode may be Q-mode.Type: ApplicationFiled: May 3, 2006Publication date: May 31, 2007Inventors: Arthur Carlson, Haixiang Liang
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Publication number: 20070121756Abstract: A method for data transmission includes forming a notched radio-frequency (RF) burst according to one or more data values, where a bandwidth of the notched RF burst is at least two percent of the center frequency of the notched RF burst. Forming a notched RF pulse includes altering, according to the data, at least one of the amplitude and phase of one or more selected components, where each of the selected components has a bandwidth within the bandwidth of the notched RF burst.Type: ApplicationFiled: January 30, 2007Publication date: May 31, 2007Applicant: General AtomicsInventors: David Humphreys, Gerald Rogerson
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Publication number: 20070121757Abstract: A calibration apparatus for a quadrature modulation system with a quadrature modulation compensator and a logarithmic envelop detector, wherein a parameter update of the quadrature modulation compensator is derived by utilizing a transformed offset value and a transformed gain value of the logarithmic envelop detector as intermediate parameters, and the transformed offset and the transformed gain parameters are used in a training sequence of the quadrature modulation compensator.Type: ApplicationFiled: November 29, 2005Publication date: May 31, 2007Inventors: Lichung Chu, Kiyoyuki Ihara, Kenji Kamitani
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Publication number: 20070121758Abstract: Methods and apparatus for estimating a transmission power required for data transmission in a communication system are disclosed. A terminal determines a quality metric of a communication link, over which data are to be transmitted, and modifies the determined quality metric by a quality metric margin. The terminal then estimates the maximum rate of data in accordance with the modified quality metric. Alternatively, the terminal estimates transmission power required for data transmission with a data rate in accordance with the modified quality metric. The quality metric margin may be a pre-determined or dynamically adjusted. The terminal dynamically adjusts the quality metric margin in accordance with a result of comparison of a transmit power corresponding to the estimated maximum rate of data with an actual transmit power used to transmit the data.Type: ApplicationFiled: January 25, 2007Publication date: May 31, 2007Applicant: QUALCOMM INCORPORATEDInventors: Nagabhushana Sindhushayana, Peter Black, Rashid Attar
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Publication number: 20070121759Abstract: Probability distribution functions (PDFs), of a periodic input data signal, can be used to provide eye-diagram information. An advantage of PDFs, over conventional approaches to eye-diagram collection, is that analog-to-digital conversion can be accomplished by the slicer of a receiver, provided the slicer can programmably change its threshold. A cumulative distribution function (CDF), at a particular phase of a desired eye-diagram, can be collected by having a receiver's slicer scan its threshold level. For each threshold level, a fixed number of symbols can be analyzed as follows to produce a CDF value: count the number of times a particular symbol value occurs. The derivative of a CDF can produce its PDF, where each PDF can represent a “slice” of a desired eye-diagram. For a non-periodic input signal, an eye diagram can still be formed so long as the percentage occurrence, of each symbol value, remains at least approximately the same.Type: ApplicationFiled: November 30, 2005Publication date: May 31, 2007Inventors: Jeffrey Sonntag, John Stonick, Daniel Weinlader
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Publication number: 20070121760Abstract: A method for suppressing impulse noises is provided. The method is employed to receive a sample stream x[n], and to detect and suppress the interruption of impulse noise to the samples, wherein the sample stream x[n] includes a plurality of samples and n represents a discrete-time independent variable. The method includes comparing the energy sum of a (k?1)th sample and a kth sample multiplied by a first constant with a first threshold, comparing energy sum of the kth sample and a (k+1)th sample multiplied by a second constant with a second threshold while the energy sum of the (k?1)th sample and the kth sample multiplied by the first constant is greater than the first threshold, and replacing the kth sample with a first replacement sample to output while the energy sum of the kth sample and the (k+1)th sample multiplied by the second constant is greater than the second threshold.Type: ApplicationFiled: March 6, 2006Publication date: May 31, 2007Inventors: Yu-Ching Yang, Jia-Shian Jiang
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Publication number: 20070121761Abstract: A phase adjustment circuit includes first to nth two-phase adjustment circuits. Each two-phase adjustment circuit includes a first logic circuit for performing logical sum of two input signals, a second logic circuit for performing logical product of the two input signals, a first delay circuit having a signal delay equal to that of the second logic circuit and configured to delay a signal output from the first logic circuit, and a second delay circuit having a signal delay equal to that of the first logic circuit and configured to delay a signal output from the second logic circuit. Two signals output from two of the two-phase adjustment circuits in a certain stage are input into one of the two-phase adjustment circuits in the next stage.Type: ApplicationFiled: September 1, 2006Publication date: May 31, 2007Inventors: Shiro Dosho, Shiro Sakiyama, Yusuke Tokunaga, Seiji Watanabe, Hiroshi Koshida
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Publication number: 20070121762Abstract: A phase-shift keying (PSK) receiver includes a carrier wave generator generating a carrier wave, an extracting unit extracting an in-phase component I and a quadrature component Q from a received signal on the basis of the carrier wave and the received signal, a comparator comparing the in-phase component I and the quadrature component Q extracted from the received signal to a predetermined threshold values respectively and acquiring 1-bit digital signals corresponding to the in-phase component I and the quadrature component Q respectively; and a BPSK demodulator demodulating the received signal using a binary phase-shift keying (BPSK) scheme on the basis of positional relationship on I-Q constellation between the 1-bit digital signals corresponding to the in-phase component I and the quadrature component Q acquired by the comparator.Type: ApplicationFiled: November 21, 2006Publication date: May 31, 2007Applicant: SEIKO EPSON CORPORATIONInventor: Hiromitsu MIZUKAMI
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Publication number: 20070121763Abstract: A device (20) for computing a threshold Sthi used in demodulating a quadrature amplitude modulated (QAM) signal to generate a plurality of soft bits per received symbol for input to a turbo decoder, the device including: means (30) for computing the mean amplitude A of the received symbols and multiplying the mean amplitude A by of the received symbols and multiplying the mean amplitude A by a constant Ci for a square QAM constellation with 4m points, such that Sthi=A×Ci where m is a positive integer and i is a positive integer from 1 to (?4m?1)?1.Type: ApplicationFiled: September 22, 2004Publication date: May 31, 2007Inventor: Thanh Bui
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Publication number: 20070121764Abstract: Different from conventional equalizers, the output of an SAIC (Single Antenna Interference Cancellation) linear equalizer in GSM/EDGE wireless communication systems is a real signal combined from two real FIR (Finite Impulse Response) filter outputs. Each of the FIRs separately uses the real and imaginary components of the ½ ? de-rotated received signal as input. The real-valued output of the SAIC equalizer creates difficulty to estimate and correct the frequency errors due to receiver LO and Doppler shift. Disclosed is an efficient and effective solution to the estimation and correction of the frequency error through an assistant signal generated by two additional FIR filters. The assistant signal and the SAIC equalizer output are used to estimate the frequency error, which is combined with the SAIC equalizer output and the assistant signal to give the frequency error corrected SAIC equalizer output.Type: ApplicationFiled: November 30, 2005Publication date: May 31, 2007Inventors: Weizhong Chen, Clark Jarvis
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Publication number: 20070121765Abstract: A timing estimator of an OQPSK demodulator is provided. In the timing estimator, an A/D converter converts an analog reception signal into a digital reception signal. A differential circuit section delays the digital reception signal from the A/D converter by a preset time and obtains a phase difference between a conjugate complex number signal of the delayed digital reception signal and the digital reception signal to offset a frequency error contained in the digital reception signal. A correlation operation section performs a correlation operation between a reference symbol differentiated in the same way as a differentiation of the differential circuit section and the reception signal to obtain each correlation value. A coherent detector detects a coherent point on the basis of the correlation value from the correlation operation section.Type: ApplicationFiled: October 12, 2006Publication date: May 31, 2007Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Sang Hyun Min, Hyung Jin Choi, Joo Hyun Do, Shin Woo Kang, Tah Joon PARK, Koon Shik Cho
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Publication number: 20070121766Abstract: Interference rejection in a wireless communication system involves determining a complement spatial-temporal signal subspace that is complement to a spatial-temporal signal subspace of an interference signal included in a received signal. The received signal is projected onto the complement spatial-temporal signal subspace, whereby the interference signal included in the received signal is reduced. Determining the complement spatial-temporal signal subspace can include estimating the interference signal; determining a Block Yule-Walker matrix for the estimated interference signal; and determining the complement spatial-temporal signal subspace from the Block Yule-Walker matrix.Type: ApplicationFiled: November 28, 2005Publication date: May 31, 2007Inventor: Shousheng He
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Publication number: 20070121767Abstract: To provide a serial transfer interface for realizing a transmission of a stable and high-quality signal although there are characteristic variances due to an environment change and an LSI process, a serial transfer interface is provided at least with a signal waveform correction unit for correcting the distortion of a signal waveform, a latch unit for latching the signal waveform with a synchronous clock and outputting it to a subsequent circuit, a filter characteristic adjustment unit for changing the filter characteristic of the signal waveform correction unit in a predetermined range, a clock generation unit for generating the synchronous clock having a desired phase, and a pattern discrimination unit for detection of a test pattern and control of the filter characteristic adjustment unit and the clock generation unit.Type: ApplicationFiled: February 17, 2006Publication date: May 31, 2007Inventor: Manabu Yamazaki
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Publication number: 20070121768Abstract: A method and associated system for processing a plurality of replicas of a signal in a signal processing chain, the method includes receiving each of the plurality of replicas of the signal at one of a corresponding plurality of respective antenna elements and orthogonally multiplexing the replicas of the signal on to a single processing chain. The multiplexed replicas are down converted from RF to baseband and converted from an analog to a digital multiplexed signal. The digital multiplexed replicas are then demultiplexed into a plurality of separate signals that correspond to replicas of the signal received at respective ones of the plurality of antennas. In variations, the orthogonal multiplexing includes frequency spreading the replicas of the signal on the single processing chain in accordance with complex Walsh codes. In other variations, the signal replicas are offset in phase by 90 degrees and time multiplexed on the single processing chain.Type: ApplicationFiled: January 31, 2007Publication date: May 31, 2007Inventor: Pieter Rooyen
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Publication number: 20070121769Abstract: Systems and methods providing clocking between various components or sub-components are shown. Embodiments implement an implied clock technique which reduces the number of signal lines, signaling overhead required for an encoded clock signal, and/or and power consumption for a high speed communication link. In accordance with embodiments efficient communication is provided between a core device and a remote device by the core device providing both clock and data signals to the remote device and the remote device providing a data signal at a predetermined clock rate without communicating its clock signal. The core device of this embodiment determines an “implied clock” suitable for accurately receiving data from the remote device.Type: ApplicationFiled: November 29, 2005Publication date: May 31, 2007Applicant: SonoSite, Inc.Inventors: Donn Gabrielson, Brent Chauvin, Blake Little
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Publication number: 20070121770Abstract: A frequency detecting and converting apparatus comprises a plurality of frequency-dividers, a multiplexer, a pulse width detector, a comparing unit and an encoder. The invention automatically detects the operating frequency of an input clock signal, divides the frequency of the input clock signal by a pre-defined integer according to the detected operating frequency and finally generates an output clock signal with an operating frequency required for an integrated circuit.Type: ApplicationFiled: November 6, 2006Publication date: May 31, 2007Inventor: Chiao-Tung Chuang
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Publication number: 20070121771Abstract: A clock supplying apparatus capable of suppressing a current fluctuation as much as possible when supply of a clock signal to a circuit block is started or stopped. At start or termination of the clock signal supply to the circuit block, the clock signal frequency is temporarily changed to a low frequency lower than a standard frequency.Type: ApplicationFiled: November 13, 2006Publication date: May 31, 2007Applicant: CANON KABUSHIKI KAISHAInventor: Naoto Yamada
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Publication number: 20070121772Abstract: Disclosed is a clock and data recovery circuit for improving the tracking speed against fluctuations or variations in a received data signal, and the clock quality, and for allowing automatic adjustment to an optimum phase of discrimination.Type: ApplicationFiled: November 26, 2004Publication date: May 31, 2007Inventor: Shigeki Wada
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Publication number: 20070121773Abstract: A phase locked loop circuit includes a phase locked loop for generating a plurality of first output signals each having a different phase but a same frequency according to a first reference signal; a control loop for generating a phase selection signal according to a second reference signal and a second output signal outputted by the phase locked loop, wherein a frequency of the second output signal is substantially equal to the frequency of the first output signals; and a phase selector for receiving the first output signals and the phase selector signal, and according to the phase selector signal selecting one of the first output signals to be a first feedback signal; wherein the first feedback signal is inputted to the phase locked loop.Type: ApplicationFiled: November 21, 2006Publication date: May 31, 2007Inventors: Chi-Kung Kuan, Yu-Pin Chou
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Publication number: 20070121774Abstract: A phase-locked loop (PLL) for stably adjusting a frequency band of a voltage-controlled oscillator and a phase locking method. In the PLL, a frequency band controller alters the frequency band selection digital value in response to an input clock signal and an oscillation control signal generated from an LPF of a basic PLL circuit, and thus a voltage-controlled oscillator of the basic PLL circuit alters the frequency of an output clock signal in response to the oscillation control signal and the frequency band selection digital value. The output clock signal is rapidly and stably phase-locked at a target frequency depending on the frequency band selection digital value.Type: ApplicationFiled: November 13, 2006Publication date: May 31, 2007Inventors: Jung Lee, Chung Suh, Hoon Kim
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Publication number: 20070121775Abstract: A memory controller and method thereof are provided. The memory controller includes a control logic circuit, a phase locked loop (PLL) and a multiplexer. The PLL generates a plurality of phase clock signals according to a system clock signal. The phase clock signals have the same frequency with the system clock. The phase clock signals have different phase difference to each other. The multiplexer receives the phase clock signals under the control of the control logic circuit, then selects and outputs one of the phase clock signals to generate a selected phase clock signal.Type: ApplicationFiled: November 30, 2006Publication date: May 31, 2007Applicant: Prolific Technology Inc.Inventors: Yu-Kuo Chen, Hsin-Chuan Chen
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Publication number: 20070121776Abstract: A system and method for inspecting, repairing and mitigating stress corrosion cracking on a pressure water reactor vessel. The reactor vessel includes inlet nozzles, outlet nozzles, and bottom mounted instrumentations. The method may include removing core barrels in the reactor vessel, installing a radiation shield in the reactor vessel, installing a coffer dam, draining the reactor vessel, lowering a tooling delivery robot into the reactor vessel, attaching the tooling delivery robot at a surface of the reactor vessel, lowering a tool cradle into the reactor vessel, and attaching the tool cradle at the surface of the reactor vessel.Type: ApplicationFiled: November 30, 2005Publication date: May 31, 2007Inventor: Hsueh-Wen Pao
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Publication number: 20070121777Abstract: A plurality of methods, computer program product, and apparatus that use a lower 32 bit field of a 64-bit 802.11 TSF timer, so as to encode the reference time instant without the ambiguity as to whether there the reference time is referring to a future time or a past time. According to an aspect of the present invention, the fact that the low order 32 bits of the TSF timer wraps over in about 71 minutes is exploited to remove any ambiguity in the reference times contained in the Schedule Element frame. One method employs an algorithm base on distance between two reference points to determine whether the timer has wrapped around a time period, and another method uses a delay interval or a timeout to determine whether or not the TSF timer is wrapped or unwrapped. Another method includes determining whether an absolute value of X?O is less than, or greater than or equal to maximum value M/2.Type: ApplicationFiled: September 20, 2004Publication date: May 31, 2007Applicant: Koninklijke Philips Electronics N.V.Inventors: Javier Del Prado Pavon, Amjad Soomro, Sai Nandagopalan, Stefan Mangold, Zhun Zhong
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Publication number: 20070121778Abstract: A system and method for detecting the spinal cord in thoracic and abdominal computed tomography (CT) volume data is disclosed. In this method, an initial spinal cord point is detected for an initial axial slice of the CT volume data. The spinal cord is then tracked from the initial spinal cord point across each remaining axial slices in opposite directions from the initial axial slice by sequentially detecting a spinal cord point for each of the remaining axial slices The initial spinal cord point is detected using a ring model based on intensity differences in the initial axial slice. For each remaining axial slice, a spinal cord center position based on at least one previously detected spinal cord point. The spinal cord points on each of the remaining axial slices are detected based on intensity differences in the axial slice as well as proximity to the predicted spinal cord center position for the axial slice.Type: ApplicationFiled: October 6, 2006Publication date: May 31, 2007Applicant: SIEMENS CORPORATE RESEARCH INCInventors: Hong Shen, Andrew Litvin
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Publication number: 20070121779Abstract: The slice thickness of tomograms of an X-ray CT apparatus is to be kept as constant as practicable within an xy plane. In projected data before three-dimensional back-projection, after convolving row-directional filter of an X-ray detector whose filter coefficient is adjusted channel by channel, three-dimensional back-projection is performed to achieve image reconstruction thereby to control the slice thickness of tomograms according to the distance from the center of the xy plane. The slice thickness is controlled to keep it as constant as practicable independent of the distance from that center to regulate the picture quality of tomograms. Further, the relative density of distances on the reconstruction plane of X-ray detector data or projection data projected on the reconstruction plane is controlled by creating virtual projection data thereby to improve the picture quality of tomograms.Type: ApplicationFiled: October 6, 2006Publication date: May 31, 2007Inventors: Akihiko Nishide, Akira Hagiwara, Kotoko Morikawa
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Publication number: 20070121780Abstract: This invention provides an X-ray CT apparatus capable of addressing a change in heart beats during a scan and a method of controlling the same. The X-ray CT apparatus includes: a data acquisition device for acquiring projection data of a subject by a helical scan synchronized with a heart beat; an image reconstructing apparatus for reconstructing an image on the basis of the collected projection data; and a controller for controlling the data acquisition device and the image reconstructing apparatus. The controller includes: first control means for changing helical pitch in accordance with a change in the heart beat during the helical scan; and second control means for reconstructing images in a plurality of slice positions at equal intervals on the basis of projection data also including projection data collected during the change in the helical pitch.Type: ApplicationFiled: November 17, 2006Publication date: May 31, 2007Inventor: Motoki Watanabe
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Publication number: 20070121781Abstract: Disclosed herein is a computed tomography (CT) detector module, for coupling with a collimator rail. The CT detector module includes a CT detector pack, a printed circuit board, and electrical conductor, and a substrate. The electrical conductor is disposed between and in electrical communication with the CT detector pack and the printed circuit board. The substrate has a slot and is disposed between the CT detector pack and the circuit board such that the electrical conductor is routed through the slot.Type: ApplicationFiled: November 28, 2005Publication date: May 31, 2007Inventors: Oded Meirav, David Hoffman
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Publication number: 20070121782Abstract: A mammography apparatus capable of obtaining a clear breast image with reduced burden on the subject. The apparatus includes a radiation irradiation section and an object table connected to an arm such that they face each other, and the breast pressed on the object table using a compression paddle is imaged by rotating the arm according to the imaging direction. In the apparatus, the size of the breast is detected, and the relative position between the radiation irradiation section and object table is changed along the side of the object table facing the chest wall of the subject according to the detected size of the breast and the direction of rotation of the arm.Type: ApplicationFiled: October 6, 2006Publication date: May 31, 2007Inventor: Tomonari Sendai
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Publication number: 20070121783Abstract: The CT threat resolution system includes an primary EDS scanning process to identify threats and the nature of threats and a plurality of secondary CT scanning processes to resolve threats. The primary EDS scanning process and secondary CT scanning processes can be either separate machines or multiple processes within a single scanner. The secondary scanning process may utilizes dual energy scanning and/or high resolution scanning to resolve threats based upon the nature of the threat. An alarm indicates threats which cannot be resolved by the secondary CT scanning process for further operator investigation. Threats may be reviewed and resolved by an operator before the secondary CT scanning process.Type: ApplicationFiled: September 29, 2006Publication date: May 31, 2007Inventors: Michael Ellenbogen, Elan Scheinman
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Publication number: 20070121784Abstract: An x-ray system for narrow bandwidth imaging of in particular small objects is provided. X-radiation from an x-ray source (1) is focused by chromatic x-ray optics (2) on an x-ray energy dependent distance from the optics. Asymmetric focusing of the x-ray optics is compensated for by choosing an asymmetric focal spot of the source. The energy selective focusing makes possible blocking unwanted x-ray energies (3) from reaching an object (4). In that way optimization of the energy according to the size of the object can be done to minimize dose and maximize signal-to-noise ratio (7). Furthermore, a critical edge subtraction image can be obtained at the object dependent optimal energy if the object is injected with a contrast agent having an absorption edge close to the optimal energy (8). Radiation is registered (5) and processed (6) to combine structural and energy subtraction images.Type: ApplicationFiled: September 18, 2006Publication date: May 31, 2007Applicant: Sectra Mamea ABInventors: Bjorn Cederstrom, Mats Danielsson, Erik Fredenberg
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Publication number: 20070121785Abstract: An X-ray optical element for and influencing of X-ray beam characteristics in two dimensions includes two reflective, curved elements arranged side-by-side to receive X-ray radiation from an X-ray beam source so that the radiation is directed onto both reflective elements and then reflected from one element onto the other element, wherein the two reflective elements are curved at different angles and have different focal lengths.Type: ApplicationFiled: July 21, 2006Publication date: May 31, 2007Inventors: Reiner Dietsch, Thomas Holz
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Publication number: 20070121786Abstract: A diagnostic/treatment instrument such as a handpiece equipped with a dental treatment tool, etc. is provided with a light radiating unit that can distinctively detect a dental lesion, to facilitate the treatment of the lesion. A light source for emitting light that can distinctively detect the lesion is mounted near the head of the handpiece to which a diagnostic/treatment tool can be attached. The light emitted from the light source illuminates an area forward of the diagnostic/treatment tool. Alternatively, the light source comprises a plurality of light-emitting devices which are arranged around the periphery of the forward end of the handpiece head in such a manner as to encircle the diagnostic/treatment tool, and radiates light to illuminate the area forward of the diagnostic/treatment tool.Type: ApplicationFiled: December 8, 2004Publication date: May 31, 2007Applicant: J. MORITA MANUFACTURING CORPORATIONInventors: Shinichi Okawa, Kenji Kino, Kazunari Matoba
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Publication number: 20070121787Abstract: A method and system for detecting airways in 3D lung image data is disclosed. The 3D lung image data is filtered using one or more filters based on first and second order derivatives of the CT image data. Each filter calculates a value for each voxel of the 3D lung image data, and the values from all of the filters are combined to determine a voxel score for each voxel. If the voxel score for a voxel is greater than or equal to a threshold value, the voxel is considered an airway candidate.Type: ApplicationFiled: November 27, 2006Publication date: May 31, 2007Applicant: SIEMENS CORPORATE RESEARCH, INC.Inventors: Atilla Kiraly, Benjamin Odry, Bjoern Coenen, Carol Novak
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Publication number: 20070121788Abstract: Modular X-ray tube (10) and method for the production of such an X-ray tube, in which an anode (20) and a cathode (30) are arranged in a vacuumized inner space (40) situated opposite each other, electrons (e?) being produced at the cathode (30) and X-rays (y) at the anode (20). The X-ray tube (10) according to the invention comprises a multiplicity of acceleration modules (41, . . . , 45), complementing one another, and each acceleration module (41, . . . , 45) comprises at least one potential-carrying acceleration electrode (20/30/423/433/443). A first acceleration module (41) thereby comprises the cathode (30), a second acceleration module (45) the anode (20). The X-ray tube (10) further comprises at least one other acceleration module (42, . . . , 44). In particular, the X-ray tube according to the invention can possess a re-closeable vacuum valve, enabling individual defective parts of the tube (10) to be replaced in a simple manner or enabling the tube (10) to be modified in a modular way.Type: ApplicationFiled: December 2, 2003Publication date: May 31, 2007Inventors: Mark Mildner, Kurt Holm
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Publication number: 20070121789Abstract: A sensor holder (10) includes a frame member (20) that bounds a void area (21) and which is configured to receive a sensor (11). A retaining means (50, 51) is provided to hold the sensor (11) to the frame (20) such that a connecting cable (12) affixed to the sensor (11) is secured and positioned by the void area (21) for a subsequent imaging procedure.Type: ApplicationFiled: August 16, 2006Publication date: May 31, 2007Applicant: Dentsply Research and Development Corp.Inventors: John Steck, Kimberly Brown, Nicole Sullivan
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Publication number: 20070121790Abstract: An “Angio Capable Portable X-Ray Fluoroscopy Unit with Sliding C-Arm and Variable Pivot Point” is disclosed. It is a new Portable C-Arm x-ray system for fluoroscopy (e.g., angio fluoroscopy) that permits head-to-foot, or cranio-caudal, angulation without appreciable degradation or rotation of the recorded image in the segment of possible views most desired to be used for cardiac angiography, generally between a vertical beam and 60 degrees to the patient's left side from vertical.Type: ApplicationFiled: November 27, 2006Publication date: May 31, 2007Inventor: John Grady
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Publication number: 20070121791Abstract: A system and method for X-ray diagnosis of an examination object is provided. The system includes a component that is movable relative to a stretcher for the examination object and at least one predeterminable set stop position for the component. A position ascertaining device is operative to ascertain a position of the component. A braking device is operative to brake the movable component. A control unit is connected to the position-ascertaining device and to the braking device. The braking device is activatable as a function of the position of the component relative to the stop position.Type: ApplicationFiled: November 16, 2006Publication date: May 31, 2007Inventors: Rainer Haupl, Claus-Gunter Schliermann
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Publication number: 20070121792Abstract: A remote test unit and method of operation are provided for utilizes the ability of an access matrix ability to route signals. The Remote Test Unit can emulate a central Digital Subscriber Line Modem (DSLM-C) for testing customer premises equipment containing a remote Digital Subscriber Line Modem (remote Digital Subscriber Line Modem). The Remote Test Unit can also emulate a remote Digital Subscriber Line Modem for testing central offices equipment including a digital subscriber line access multiplexer (DSLAM) containing a central Digital Subscriber Line Modem. The Remote Test Unit can also emulate a concentrator connected to the DSLAM, a router connected to the concentrator, an Internet service provider (ISP) connected to the router, and a web site connected to the Internet service provider over the Internet.Type: ApplicationFiled: November 22, 2006Publication date: May 31, 2007Applicant: Sunrise Telecom IncorporatedInventor: Raymond Chong