Abstract: A recording unit is rotatable about an axis of rotation, and includes an X-ray emitter and detector to detect X-rays from a fan-shaped region. The fan-shaped region is asymmetrical in relation to a vertical to the axis of rotation, running through the X-ray detector wherein the two edges of the fan-shaped region, on rotation, in each case tangentially delimit a first projection region and a second projection region. The second projection region abuts the first projection region. A method includes recording projections of the two projection regions during a full rotation of the recording unit for the reconstruction of a first image of the first projection region in such a way that the projection angle intervals in each case exhibit the same start angle. It further includes reconstructing a second image of the second projection region to merge the two reconstructed projection regions to form one unitary image.

Abstract: The present specification discloses an X-ray system for processing X-ray data to determine an identity of an object under inspection. The X-ray system includes an X-ray source for transmitting X-rays, where the X-rays have a range of energies, through the object, a detector array for detecting the transmitted X-rays, where each detector outputs a signal proportional to an amount of energy deposited at the detector by a detected X-ray, and at least one processor that reconstructs an image from the signal, where each pixel within the image represents an associated mass attenuation coefficient of the object under inspection at a specific point in space and for a specific energy level, fits each of pixel to a function to determine the mass attenuation coefficient of the object under inspection at the point in space; and uses the function to determine the identity of the object under inspection.

Abstract: On the front side of an n-type semiconductor substrate, p-type regions are two-dimensionally arranged in an array. A high-concentration n-type region and a p-type region are disposed between the p-type regions adjacent each other. The high-concentration n-type region is formed by diffusing an n-type impurity from the front side of the substrate so as to surround the p-type region as seen from the front side. The p-type region is formed by diffusing a p-type impurity from the front side of the substrate so as to surround the p-type region and high-concentration n-type region as seen from the front side. Formed on the front side of the n-type semiconductor substrate are an electrode electrically connected to the p-type region and an electrode electrically connected to the high-concentration n-type region and the p-type region.

Abstract: The present invention relates to systems and methods for reducing motion artifacts in x-ray sampling circuits. The detector system output is sampled at a rate than the x-ray exposure rate to reduce blurring associated with motion of the detector and/or object being scanned.

Abstract: A touch-sensitive apparatus comprises a panel for conducting signals from incoupling points to outcoupling points. Detection lines are defined between pairs of incoupling and outcoupling points. A signal generator is coupled to the incoupling points to generate the signals. A data processor processes the output signal to generate a set of data samples, which are non-uniformly arranged in a two-dimensional sample space. Each data sample is indicative of detected energy on a detection line and is defined by a signal value and first and second dimension values defining the location of the detection line on the surface portion. Adjustment factors are obtained for the data samples, each adjustment factor being representative of the local density of data samples in the sample space. The data samples are processed by tomographic reconstruction, while applying the adjustment factors, to generate a reconstructed distribution of an energy-related parameter within the surface portion.

Abstract: To generate a reconstructed image suitable to characteristics of a bilaterally symmetric site and possible to an appropriate image diagnosis, a computation device: computes a back projection phase width at a rotational center and distance between the rotational center location which is a reference location and a pixel to be reconstructed; according to the distance between the rotational center location and the pixel to be reconstructed, sets a function (f1) changing the back projection phase width; computes a back projection phase width in the pixel to be reconstructed, substituting a value of the distance between the rotational center location and a pixel to be reconstructed in the function (f1); computes a view weighting, on the basis of the back projection phase width in the post-correction pixel to be reconstructed and a slope width of a view weighting function; and reconstructs a CT image, using the view weighting.

Abstract: A detection apparatus for detecting photons, such as used in radiographic imaging systems includes a detection unit that generates detection signal pulses having a detection signal pulse height being indicative of the energy of the detected photons, a detection values generation unit that generates energy-resolved detection values depending on the detection signal pulses and a signal pulse generation unit that generates artificial signal pulses having a predefined artificial signal pulse height and a predefined generated rate. The detection values generation unit determines an observed rate of the artificial signal pulses having an artificial signal pulse height being larger than a predefined threshold as observed by the detection values generation unit and determines an offset of the detection signal pulses depending on the determined observed rate. This allows reliably determining the offset of the detection signal pulses, which can be used for correcting the finally generated detection values.

Abstract: An x-ray detector of a grid-based phase-contrast x-ray device and a method for operating a grid-based phase-contrast x-ray device. Signal values of detector elements are combined to form group signal values. An image computing unit calculates an x-ray beam phase value from the group signal values.

Abstract: This radiation therapy device controller selects, for a plurality of body motion phases, computed tomography image data obtained which shows a diseased portion, and generates, for each rotation angles of a ray source and a sensor array, a reconstructed image. The control device generates a radiation projection image which shows the diseased portion when the radiation is radiated if the rotation angle is a predetermined rotation angle, compares the reconstructed image of each of the plurality of body motion phases with the radiation projection image, and determines a body motion phase indicated by a reconstructed image in which a difference is small, to be a current respiratory phase. As a result, a position of the diseased portion calculated for the computed tomography image data in the computed tomography image data group of the respiratory phase in advance is identified to be a current position of the diseased portion.

Abstract: An X-ray CT apparatus includes an X-ray tube, X-ray detector detecting the X-rays transmitted through an object, data acquisition unit acquiring projection data of the object based on an output from the X-ray detector, bed driving control unit moving a top to place the object along a long-axis direction of the top, image processing unit generating a reconstructed image based on the projection data, positional shift amount detection unit detecting a shift amount of a relative position between the top and the object, and positional shift processing unit performing processing based on a detection result obtained by the positional shift amount detection unit, in accordance with movement of the top by the bed driving control unit.

Abstract: An imaging device comprises a sensor of surface area of at least 10 cm2 and comprising: an image zone produced on a single substrate and comprising a group of pixels disposed in rows and columns, the number of pixels per column not being uniform for all the columns of pixels, each pixel collecting electric charges generated by a photosensitive element, row conductors linking the pixels row by row, column conductors linking the pixels column by column, row addressing blocks linked to the row conductors to address each row of pixels individually, and column reading blocks linked to the column conductors to read the electric charges collected by the pixels of the row selected by the row addressing blocks, the column reading blocks being situated at the periphery of the image zone; the row addressing blocks and the column reading blocks being produced on the same substrate as the image zone.

Abstract: A method for generating a 3-dimensional reconstruction model of an object of interest that lies within a volume, the method executed at least in part by a computer, acquires a first set of projection images of the volume at a first exposure and a first field of view and a second set of projection images of the object of interest within the volume at a second exposure that is higher than the first exposure and a second field of view that is narrower than the first field of view. An object of interest is reconstructed from the second set of projection images according to information related to portions of the volume that lie outside the object of interest. The reconstructed object of interest is displayed.

Abstract: An imaging system includes a computer programmed to reconstruct original CT projection data, estimate noise in image space, forward project the image noise estimate to generate an initial projection noise estimate, modify the initial projection noise estimate using a statistical property of noise in projection space, remove noise in the original CT projection data by subtracting the modified noise estimate therefrom to generate noise-removed projection data, and reconstruct a final image based on the noise-removed projection data.

Abstract: The X-ray diffraction apparatus irradiates a sample with an X-ray and performs frame photographing in each X-ray diffraction angle, and includes a control section (141) controlling the frame photographing by scanning without closing a shutter, a data acquisition section (142) acquiring detection data of each frame which has been detected by a semiconductor pixel detector in the frame photographing, a frame integration section (146) integrating the detection data which has been acquired in each scanning for each frame, and a determination section (147) determining whether the integrated detection data has a sufficient intensity or not, and the control section (141) controls so as to finish measurement when the integrated detection data has a sufficient intensity and so as to perform the scanning again when the integrated detection data does not have a sufficient intensity.

Abstract: Disclosed are a method and apparatus for improving image reconstruction speed, to improve the image reconstruction speed by acquiring optimal thread configurations of execution units under different scanning conditions.

Abstract: An X-ray CT apparatus according to an embodiment includes an X-ray detector and a collimator unit. The X-ray detector detects X-rays that have passed through a subject. The collimator unit eliminates scattered radiation from X-rays that are incident on the X-ray detector. The collimator unit includes a plurality of collimator modules, a supporter, and a fixing unit. The plurality of collimator modules each includes a plurality of first collimator plates arranged in a grid along a channel direction and a slice direction that are orthogonal to each other. The supporter supports the collimator modules such that the collimator modules are aligned in a plurality of straight lines along the channel direction and in a plurality of straight lines along the slice direction. The fixing unit is provided to the supporter and fixes positions of the collimator modules in the channel direction and the slice direction.

Abstract: According to one embodiment, an X-ray CT apparatus includes an energy classifying unit, a setting unit, and an image generating unit. The energy classifying unit is configured to classify photons passing through an object into a number of energy bins in accordance with energy of the photons. The setting unit is configured to set an energy level and set an energy width of a plurality of energy bins of the number of energy bins. The image generating unit is configured to generate an extended energy bin image based on information on the photons classified into the plurality of energy bins, the image having the energy level and the energy width of the plurality of energy bins.

Abstract: The present invention relates to mixed oxide materials, methods for their preparation, detectors for ionizing radiation and CT scanners. In particular, a mixed oxide material is proposed having the formula (YwTbx)3Al5-yGayO12:Cez, wherein 0.01?w?0.99, 0.01?x?0.99, 0?y?3.5 and 0.001?z?0.10 and wherein w+x+3*z=1, whereby the mixed oxide material is doped with at least 10 ppm V.

Abstract: An attenuation correction method and device for an image in a PET system. The method includes: acquiring transmission scanning sinogram data from a PET apparatus; reconstructing the transmission scanning sinogram data with Bayesian model-based Ordered Subset Expectation Maximization (OSEM-B) algorithm and Filtered Back Projection (FBP) algorithm, to obtain an OSEM-B attenuation image and a first FBP attenuation image respectively; performing a weighted calculation on the OSEM-B attenuation image and the first FBP attenuation image to obtain an effective attenuation image; and performing attenuation correction on emission scanning sinogram data from the PET apparatus by using an attenuation sinogram generated based on the effective attenuation image.

Abstract: A method includes performing a three dimensional volume scan of a region of interest located in a portion of an object or subject in an examination region, including dynamically collimating a radiation beam used to perform the scan so that a geometry and/or location of the radiation beam tracks, during the scan, to a geometry and/or location of the region of interest, wherein the region of interest is a sub-region of the portion of the object or subject in the examination region.

Abstract: A thin film transistor array substrate for a digital photo-detector is provided. The photo-detector includes a plurality of gate lines to supply a scan signal; a plurality of data lines to output data, the data lines arranged in a direction crossing the gate lines, wherein cell regions are defined by the gate lines and the data lines; a photodiode in each of the cell regions to perform photoelectric conversion; a thin film transistor at each intersection between the gate lines and the data lines to output a photoelectric conversion signal from the photodiode to the data lines in response to a scan signal supplied by the gate lines; and a light-shielding layer over each channel region of the respective thin film transistors. Each light-shielding layer is electrically connected to the respective gate line.

Abstract: An X-ray CT apparatus includes an X-ray tube, an X-ray detector, and a control unit. The X-ray detector includes at least two divided ranges. One range includes a small detection range in which X-ray detection elements of a small size for detecting the X-rays radiated from the X-ray tube are arrayed. The other range includes a large detection range in which the X-ray detection elements of a large size for detecting the X-rays radiated from the X-ray tube are arrayed. The control unit is configured to select the small detection range or the large detection range. The X-ray CT apparatus can efficiently achieve high resolution upon imaging and, further, is capable of fully utilizing X-ray detection elements of a small detector size.

Abstract: Provided are a tomography image generating method and an apparatus for generating a tomography image. The method of generating a tomography image includes, in response to a depth scan operation performed on an object, generating a candidate tomography image by using an interference signal acquired by the performed depth scan operation, determining a pixel pattern by using the generated candidate tomography image; and when the depth scan operation performed on the object is completed, generating a final tomography image of the object by using a finally determined pixel pattern. The generating the candidate tomography image and the determining are parallel processed by at least one processor during the depth scan operation being repeatedly performed.

Abstract: An Adjustable Photon Detection System (APDS) for multi-slice X-ray CT systems and a multi-slice X-ray CT system using the APDS are disclosed; wherein the APDS can be adjusted to be aligned to different X-ray source positions; wherein the multi-slice X-ray CT system comprises one or more X-ray sources, and one or more APDS; wherein the multi-slice X-ray CT system may also include a detector position calculator for calculating effective detector positions and a detector position corrector for correcting projection data using calculated effective detector positions.

Abstract: An x-ray imaging device may include a detector array and an x-ray converting layer coupled to the detector array. The detector array and the x-ray converting layer may be configured such that x-rays traverse the detector array before propagating in the x-ray converting layer. The x-ray imaging device may also include a buildup layer behind the x-ray converting layer. The x-ray imaging device may be used as a “universal” imager for both MV and kV imaging.

Abstract: A method and a device produce X-ray images of objects, according to which artifacts caused by scattered radiation are corrected. To this end, a modulator field is used, that can be moved from a first position to a second position, thereby enabling modulator field areas with small and relatively large X-ray attenuation coefficients to be interchanged. An initial amplitude-modulated projection of the object is respectively produced in each of the two positions, and a scattered image associated with the projection is respectively calculated. This is especially suitable for rapid CT scans.

Abstract: A first angle acquiring unit acquires a rotational angle of a characteristic portion in a predetermined region on an inlet side of an insertion member of a linear body extending through the insertion member. From an image of the linear body inserted into a body of a subject, a second angle acquiring unit acquires a direction of a curved portion of the linear body inserted into the body of the subject and then acquires a rotational angle of a distal end of the linear body. A torque calculation unit calculates a torque based on a difference between the rotational angle in the predetermined region acquired by the first angle acquiring unit and the rotational angle of the distal end of the linear body acquired by the second angle acquiring unit.

Abstract: The invention relates to a method for providing quantitative measures of the flow property of a blood vessel. The method is based on analyzing cross-sectional images of a vessel by estimating the area of the lumen of the vessel. The method comprises steps of determining a point contained within the walls of the vessel, determining a closed path which approximates the inner circumference of the wall of the vessel, and determining the area of the closed path when the vessel is most expanding in order to get a measurement of the maximum lumen. This method may enable the clinical personnel to quickly evaluate the flow property e.g. of an inserted bypass vessel and, thereby, conclude if the surgical intervention is successful or if adjustments are required.

Abstract: An apparatus for distinguishing an energy band of a photon in a readout circuit that counts photons in multi-energy radiation incident onto a sensor for each energy band includes an integrator configured to accumulate an electric signal received from the sensor that has undergone photoelectric conversion from the photon; a comparator configured to compare an accumulated electric signal received from the integrator with one of a plurality of threshold values; and a signal processor configured to instruct sequential switching from one of the plurality of threshold values to another one of the plurality of threshold values according to a result of a comparison received from the comparator; and output a digital signal that distinguishes an energy band of the photon based on results received from the comparator of sequential comparisons of the accumulated electric signal with the plurality of threshold values.

Abstract: A radiation image pickup apparatus capable of setting an optimum threshold value used for instantaneously and highly accurately detecting the presence/absence of irradiation includes a pixel array having a plurality of pixels arranged in a matrix, where each of the pixels includes a conversion element and a switch element, a drive circuit for supplying a drive signal for controlling the switch element between a conducting state and a non-conducting state, a detection unit for outputting a detection signal varying with the intensity of irradiation of the pixel array, and an arithmetic unit for calculating an end threshold value used to detect end of irradiation on the basis of the signal output from the detection unit during a period of time during which irradiation is applied to the pixel array in which the switch elements of the pixels are set in a non-conducting state by the drive circuit.

Abstract: The invention relates to a medical device operating with X-rays, comprising: an X-ray source, from which an X-ray beam that has an intensity maximum along a central ray can be emitted, a rotation unit, with which the X-ray source can be rotated about an isocenter, wherein the central axis of the X-ray beam is oriented eccentrically to the isocenter such that, in particular upon rotation about the isocenter, the central rays emitted from different spatial directions are tangential to an imaginary circle around the isocenter. Furthermore, the invention relates to a method for operating a medical device, comprising the following steps: providing an X-ray source, from which an X-ray beam that has an intensity maximum along a central ray is emitted, rotating the X-ray source about an isocenter.

Abstract: A medical imaging apparatus, processing device or specialized circuit can include an input interface to input scan data of a medical image scan of a target object, a processor to generate an output image from the input scan data, and an output interface to output the output image to, e.g., a display. The processor can execute a first reconstruction of the scan data to obtain an intermediate image of the target object, a high-density forward projection of the intermediate object to obtain generated data, a sinogram updating using both of the generated data and the scan data to obtain a high-resolution sinogram, and a second reconstruction based on the high-resolution sinogram to obtain an output image.

Abstract: Various embodiments of a 3D high resolution X-ray sensor are described. In one aspect, an indirect X-ray sensor includes a silicon wafer that includes an array of photodiodes thereon with each of the photodiodes having a contact on a front side of the silicon wafer and self-aligned with a respective grid hole of an array of grid holes that are on a back side of the silicon wafer. Each of the grid holes is filled with a scintillator configured to convert beams of X-ray into light. The indirect X-ray sensor also includes one or more silicon dies with an array of photo-sensing circuits each of which including a contact at a top surface of the one or more silicon dies. Contact on each of the photodiodes is aligned and bonded to contact of a respective photo-sensing circuit of the array of photo-sensing circuits of the one or more silicon dies.

Abstract: A light receiving section and a substrate-side electrode pad of a photoelectric conversion substrate, a base-side electrode pad and an interconnect arranged on a surface side of a base are integrally coated with a protective layer. A scintillation layer is formed on a surface side of the protective layer. Corrosion of a photoelectric conversion element of the light receiving section, the electrode pads and the interconnect is prevented by the protective layer. When they are integrally coated with the protective layer, the light receiving section and the substrate-side electrode pad of the photoelectric conversion substrate can be arranged with a distance therebetween shortened, thereby realizing miniaturization of a detector and enlargement of the light receiving section.

Abstract: A photon counting type image detector has: a semiconductor cell that detects an X-ray photon; a charge amplifier that generates a plurality of electric pulses each being based on an electric charge collected in response to the detected X-ray photon; a comparator that discriminates a peak value of each of the electric pulses; a threshold logic circuit that performs control so as to count none of the peak-discriminated electric pulses corresponding to energy of characteristic X-rays produced in the semiconductor cell; and a counter that counts the discriminated electric pulses as controlled by the threshold logic circuit.

Abstract: A thin film transistor array substrate for a digital photo-detector is provided. The photo-detector includes a plurality of gate lines to supply a scan signal; a plurality of data lines to output data, the data lines arranged in a direction crossing the gate lines, wherein cell regions are defined by the gate lines and the data lines; a photodiode in each of the cell regions to perform photoelectric conversion; a thin film transistor at each intersection between the gate lines and the data lines to output a photoelectric conversion signal from the photodiode to the data lines in response to a scan signal supplied by the gate lines; and a light-shielding layer over each channel region of the respective thin film transistors. Each light-shielding layer is electrically connected to the respective gate line.

Abstract: According to one embodiment, an X-ray computed tomography apparatus includes a rotating frame rotatably supporting an X-ray tube and an X-ray detector detecting X-rays transmitted through an object on a top, a plan storage unit storing a plan for sequentially executing scans to acquire projection data sets with rotation of the rotating frame, a scan information storage unit storing scan information including projection data sets, and a scan control unit determining positions of the rotating frame and the top based on the plan and the scan information when the plan is interrupted and resuming at least one of the plurality of scans in the plan.

Abstract: The present application is a photodiode detector array for use in computerized tomography (CT) and non-CT applications. Specifically, the present application is a high-density photodiode arrays, with low dark current, low capacitance, high signal to noise ratio, high speed, and low crosstalk that can be fabricated on relatively large substrate wafers. More specifically the photodiode array of the present application is fabricated such that the PN-junctions are located on both the front side and back side surfaces of the array, and wherein the front side PN-junction is in electrical communication with the back side PN-junction. Still more specifically, the present application is a photodiode array having PN-junctions that are electrically connected from the front to back surfaces and which can be operated in a fully depleted mode at low reverse bias.

Abstract: An imaging system including a source (310) having a focal spot (406) that emits a radiation beam that traverses an examination region, a radiation sensitive detector array (316) having a plurality of pixels that detects radiation traversing the examination region and generates projection data indicative of the detected radiation, and a filter (314), disposed between the source and the examination region, that filters peripheral regions of the emitted radiation, wherein the filter includes two separate and moveable regions (402), each region having a substantially same thickness and constant homogeneity.

Abstract: An image pickup panel (1) includes: photodetection sections (10) each including a photodetector (11-1) and a receiver (11-2) which are integrally molded and having solder bumps (12) formed thereon, the photodetector converting received light into a current signal, the. receiver converting the current signal into a voltage signal; and a wiring layer (20) including a wiring pattern installed therein and allowing the photodetection sections to be mounted thereon for respective pixels by the solder bumps, the wiring pattern being connected to the photodetection sections.

Abstract: A system for emitting X-ray energy is disclosed. An X-ray emitter emits photons in a first X-ray band toward a first photon conversion layer. The first photon conversion layer receives the photons in the first X-ray band and converts the photons in the first X-ray band to photons in a plurality of different second predetermined X-ray bands. The first photon conversion layer emits the photons in the plurality of different second predetermined X-ray bands in a downstream direction toward a second photon conversion layer.

Abstract: A method is provided for determining, for a fourth-generation computed tomography (CT) scanner that includes a third-generation X-ray source and detector system and a plurality fixed, sparse photon-counting detectors (PCDs), a position of each PCD of the plurality of PCDs. The method includes determining, for a given PCD, a set of view angles at which the PCD will cast a shadow on the third-generation detector; determining, for each view, by analyzing projection data obtained from a reference scan, a corresponding shadow location on the third-generation detector caused by the given PCD; generating, for each view, a line connecting a position of the X-ray source at the view angle, and a corresponding shadow location of the set of shadow locations; determining locations of all intersection points of the set of lines; and determining a PCD centerline of the given PCD based on the locations of the intersection points.

Abstract: According to an embodiment, a signal processing device includes an integrator, a first analog-to-digital converter, and a histogram creator. The integrator is configured to integrate an electrical charge corresponding to electromagnetic waves. The first analog-to-digital converter is configured to perform an analog-to-digital conversion operation that generates digital data of the electrical charge using an integration output from the integrator, on a parallel with an integration operation performed by the integrator. The histogram creator is configured to create a histogram that represents an energy distribution of the electromagnetic waves, from the digital data generated by the first analog-to-digital converter.

Abstract: A vertical radiation sensitive detector array (114) includes at least one detector leaf (118). The detector leaf includes a scintillator array (210, 502, 807, 907), including, at least, a top side (212) which receives radiation, a bottom side (218) and a rear side (214) and a photo-sensor circuit board (200, 803, 903), including a photo-sensitive region (202, 508, 803, 903), optically coupled to the rear side of the scintillator array. The detector leaf further includes processing electronics (406) disposed below the scintillator array, a flexible circuit board (220) electrically coupling the photo-sensitive region and the processing electronics, and a radiation shield (236) disposed below the bottom of the scintillator array, between the scintillator and the processing electronics, thereby shielding the processing electronics from residual radiation passing through the scintillator array. Some embodiments incorporate rare earth iodides such as SrI 2 (Eu).

Abstract: A detector system for an imaging system includes an airflow cooling system. The detector system includes a detector chassis, a duct extending along the length of the chassis, and a manifold that couples the duct to the interior of the chassis. A vacuum source, such as a suction fan, is coupled to the duct and generates a vacuum force within the duct. The chassis includes a plurality of inlet openings, with an airflow path being defined through the interior of the chassis between the inlet openings and the manifold. The suction fan pulls cooling air through the inlet openings, through the chassis and manifold to the duct, and then expels the air through an exhaust opening. The airflow is directed into thermal contact with detector elements and associated electronics in the detector chassis to provide cooling of these components.

Abstract: Radiation flux can be adjusted “on the fly” as an object (204) is being scanned in a security examination apparatus. Adjustments are made to the radiation flux based upon radiation incident on a first radiation detector (226) in an upstream portion (233) of an examination region. The object under examination is thus exposed to different radiation flux in coordination with a downstream motion (235) of the object relative to a second radiation detector (228). The radiation flux is adjusted so that a sufficient number of x-rays (that traverse the object) are incident on the second radiation detector. Images of the object can then be generated based upon data from the second radiation detector, where these images are thus of a desired/higher quality.

Abstract: Methods and systems for performing x-ray computerized tomographic (CT) reconstruction of imaging data on a rotatable portion of the system, such as a ring-shaped rotor. The rotor may include an x-ray source, and x-ray detector system and a processor, coupled to the detector system, for performing tomographic reconstruction of imaging data collected by the detector system.

Abstract: On the front side of an n-type semiconductor substrate, p-type regions are two-dimensionally arranged in an array. A high-concentration n-type region and a p-type region are disposed between the p-type regions adjacent each other. The high-concentration n-type region is formed by diffusing an n-type impurity from the front side of the substrate so as to surround the p-type region as seen from the front side. The p-type region is formed by diffusing a p-type impurity from the front side of the substrate so as to surround the p-type region and high-concentration n-type region as seen from the front side. Formed on the front side of the n-type semiconductor substrate are an electrode electrically connected to the p-type region and an electrode electrically connected to the high-concentration n-type region and the p-type region.

Abstract: A medical imaging system can include a frame that has a bore that has a central longitudinal axis that intersects a target area for imaging, and a radiation source to emit radiation in radial directions towards the target area to form a fan or cone of emitted radiation that irradiates a cross-section of the target area with respect to the longitudinal axis. The system can include one or more detector arrays including a plurality of detector segments that extend along a detector axis that extends in a direction that is effectively parallel to the longitudinal axis, such that radiation emitted from the radiation source passes through the target area and is incident on one or more of the detector segments. The detector segments can each include a detecting surface that is tilted such that the detecting surface has a tilt (e.g., a non-zero slope) with respect to the detector axis.

Abstract: A volumetric stationary CT system has at least one stationary array of x-ray detectors extending proximate at least a portion of an imaging volume, at least one stationary x-ray source proximate the stationary array or arrays of x-ray detectors, and a collimator having a slit with a non-uniform opening width. The collimator is intermediate the stationary x-ray source and the stationary array of x-ray detectors. The result is a uniform flux normal to the detector array across the entire length thereof.