Abstract: A first image including a projection of a portion is generated based on data representing attenuation of higher-energy radiation having a peak energy of at least 1 MeV that passes through a portion of an inspection volume. A second image including a projection of the portion is generated based on data representing attenuation of lower-energy radiation passing through the portion of the inspection volume. A dual-pixel image is created from the first image and the second image. A region of interest is selected from the dual-pixel image. A first basis function that is derived from an attenuation characteristic associated with the region of interest is selected. The region of interest is represented in terms of an amplitude associated with the first basis function and an amplitude associated with the second basis function.

Abstract: A scintillator element (114) comprising uncured scintillator material (112) is formed and optically cured to generate a cured scintillator element (122, 122?). The uncured scintillator material suitably combines at least a scintillator material powder and an uncured polymeric host. In a reel to reel process, a flexible array of optical detectors is transferred from a source reel (100) to a take-up reel (106) and the uncured scintillator material (112) is disposed on the flexible array and optically cured during said transfer. Such detector layers (31, 32, 33, 34, 35) are stackable to define a multi-layer computed tomography (CT) detector array (20). Detector element channels (50, 50?, 50?) include a preamplifier (52) and switching circuitry (54, 54?, 54?) having a first mode connecting the preamplifier with at least first detector array layers (31, 32) and a second mode connecting the preamplifier with at least second detector array layers (33, 34, 35).

Abstract: A CT system includes a rotatable gantry having an opening to receive an object to be scanned, an x-ray source configured to project an x-ray beam toward the object having a primary intensity, a detector configured to detect high frequency electromagnetic energy passing through the object and output imaging data, and a data acquisition system (DAS) connected to the detector and configured to receive the imaging data. The system also includes a computer programmed to obtain image projection data of the object from the DAS, correct the projection data using a scatter function that is based at least on a known characteristic of the x-ray beam, and generate images using the corrected projection data.

Abstract: A radiation detector (24) includes a two-dimensional array of upper scintillators (30?) which is disposed facing an x-ray source (14) to convert lower energy radiation events into visible light and transmit higher energy radiation. A two-dimensional array of lower scintillators (30B) is disposed adjacent the upper scintillators (30?) distally from the x-ray source (14) to convert the transmitted higher energy radiation into visible light. Upper and lower photodetectors (38?, 30B) are optically coupled to the respective upper and lower scintillators (30?,30B) at an inner side (60) of the scintillators (30?,30B). An optical element (100) is optically coupled with the upper scintillators (30?) to collect and channel the light from the upper scintillators (30?) into corresponding upper photodetectors (38?).

Abstract: Embodiments of methods and/or apparatus for 3-D volume image reconstruction of a subject, executed at least in part on a computer for use with a digital radiographic apparatus can obtain image data for 2-D projection images over a range of scan angles. For each of the plurality of projection images, an enhanced projection image can be generated. In one embodiment, through the application of a resolution increasing interpolator, a prescribed CBCT routine scanning mode with preset binning can increase a spatial resolution, Nyquist frequency or MTF.

Abstract: A two dimensional collimator assembly and method of manufacturing thereof is disclosed. The collimator assembly includes a wall structure constructed to form a two dimensional array of channels to collimate x-rays. The wall structure further includes a first portion positioned proximate the object to be scanned and configured to absorb scattered x-rays and a second portion formed integrally with the first portion and extending out from the first portion away from the object to be scanned. The first portion of the wall structure has a height greater than a height of the second portion of the wall structure. The second portion of the wall structure includes a reflective material coated thereon in each of the channels forming the two dimensional array of channels.

Abstract: An imaging system includes a radiation source that emits radiation that traverses an examination region. A controller activates the radiation source to emit radiation and deactivates the radiation source to stop radiation emission. The controller selectively activates the radiation source to emit radiation at one or more pre-determined angles. In another embodiment, the imaging system includes a data processing component that generates a virtual three dimensional image of an object of interest of the scanned subject based on the image data. In another embodiment, the imaging system is in a communication with a data manipulation and packaging component that generates at least a two dimensional or a three dimensional data set based on the volumetric image data and packages the data set in an object provided to a remote system that manipulates and navigates through the data set.

Abstract: A liquid cooled thermal control system and method for cooling an imaging system are provided. One imaging system is a computed tomography (CT) system having a detector that is positioned on a detector rail. The detector includes a plurality of detector components. At least some of the detector components are configured to detect x-rays. A liquid cooled thermal control system is provided having cooling channels in thermal communication with the detector rail. The cooling channels have a cooling fluid flowing therethrough to control a temperature of the detector components in response to one or more disturbances that changes a temperature of the x-ray detector. A control module is also provided in the liquid cooled thermal control system to adjust parameters of the liquid cooled thermal control system in response to the disturbances.

Abstract: A CT system includes a rotatable gantry having an opening to receive an object to be scanned, an x-ray source configured to project an x-ray beam toward the object, and a detector array configured to detect x-rays passing through the object. The detector array includes a first array of pixels positioned to receive x-rays that pass to the detector array outside a first field-of-view (FOV) to a second FOV, the first array of pixels providing a first resolution, and a second array of pixels positioned to receive x-rays passing through the first FOV, the second array of pixels providing a second resolution that is different from the first resolution. The system includes a data acquisition system (DAS) configured to receive outputs from the detector array, and a computer programmed to acquire projections of imaging data of the object, and generate an image of the object using the imaging data.

Abstract: An arrangement and a method are disclosed for projective and/or tomographic phase-contrast imaging using X-ray radiation. In at least one embodiment, one or more phase grids is/are arranged in the beam path such that during a rotation of the at least one X-ray source, the examination object is scanned with different spatial orientations of the grid lines relative to the examination object such that the complete refraction angle, and hence the complete phase shift gradient, can be determined for each X-ray beam from the two scans with differently oriented phase grids in order to be able to show the phase shift of an examination object in terms of projections or in a tomographic image.

Abstract: An X-ray imaging apparatus has at least one X-ray image system rotatable about an examination volume. The X-ray image system is controlled such that during a continuous rotation of the system, at least one 2D projection image is recorded. An image generation facility generates the 2D projection image from the measured data. The X-ray source includes an X-ray focus which can be changed in terms of position, which, during the recording of the 2D projection image, moves counter to the direction of rotation of the X-ray image system such that its spatial position in a fixed coordinate system does not change. The X-ray detector records several 2D partial images, from which the 2D projection image is calculated with the rotational movement of the X-ray detector being at least approximately compensated. The 2D projection images have significantly reduced image blur.

Abstract: A wavefront measuring apparatus includes an optical element forming a periodic pattern by light, a detector having pixels to detect the light, and a computer computing, based on detection results of the detector, wavefront information at positions in a wavefront of the light transmitted through or reflected by a specimen. The detector detects a first periodic pattern formed by the light, and a second periodic pattern formed by the light and shifted in phase from the first periodic pattern. The computer computes the wavefront information at one of the positions by using a result detected in a first pixel of the pixels when detecting the first periodic pattern, a result detected in a second pixel of the pixels when detecting the first periodic pattern, the second pixel being positioned within three pixels from the first pixel, and a result detected in the first pixel when detecting the second periodic pattern.

Abstract: In a method and device for generating a tomosynthetic 3D x-ray image, a number of digital x-ray images of an examination subject are acquired at respectively different projection angles, within a limited angle range, using an x-ray source and a digital x-ray detector. At an initial position for a selected projection angle, a spatially-fixed reference point is projected onto a partial region of the acquisition surface of the x-ray detector. For each further projection angle, a corresponding partial region on the acquisition surface is automatically determined. The tomosynthetic 3D image is reconstruction exclusively using image data from the respective partial regions.

Abstract: An X-ray imaging apparatus and method is provided. An X-ray imaging apparatus includes an X-ray radiation unit configured to radiate a first X-ray and a second X-ray onto a target along a predetermined path, an X-ray detection unit configured to detect the radiated first X-ray and the second X-ray that have passed through the target, and an image data generation unit configured to generate cross-section data that respectively corresponds to the detected first X-ray and the detected second X-ray and represents a predetermined cross-sectional layer of the target. The first X-ray is radiated at a location on the predetermined path that is different from a location on the predetermined path at which the second X-ray is radiated, the first X-ray including X-ray spectra that are different from X-ray spectra of the second X-ray.

Abstract: A dental and orthopedic densitometry modeling system includes a controller with a microprocessor and a memory device connected to the microprocessor. An input device is also connected to the microprocessor for inputting diagnostic procedure parameters and patient information. X-ray equipment including an X-ray source and an X-ray detector array are connected to a positioning motor for movement relative to a patient's dental or orthopedic structure in response to signals from the microprocessor. The output consists of a tomographical densitometry model. A dental/orthopedic densitometry modeling method involves moving the X-ray equipment across a predetermined scan path, emitting dual-energy X-ray beams, and outputting an image color-coded to correspond to a patient's dental or orthopedic density.

Abstract: A method for reconstruction of a 3D volume from a set of projection images recorded by a tomography apparatus using penetrating radiation in the field of dental medical applications takes into account a given value of at least one parameter. Simulated projection images are generated which correspond to at least a subset of the recorded projection images by simulating a projection of the penetrating radiation through the reconstructed 3D volume taking into account said given value of the at least one parameter. A re-projection error is determined by comparing the simulated projection images (with the corresponding recorded projection images. The re-projection error is then minimized by changing the value of the at least one parameter and by iterating over the above steps.

Abstract: A water-soluble salt of a metal with a high atomic weight is selected as an X-ray contrast substance providing a selective ion-exchange reaction with a component. The salt has a general formula R+M?, where R+ is selected from a group consisting of Ba2+; Sr2+; Tl+; Rb+ . . . , and M? is selected from a group consisting of Cln; NOn; OHn; CH3COO, SO4; . . . in accordance with a standard table of inorganic substances' water solubility. The X-ray contrast substance is injected into a sample of a porous material. Upon completion of the selective ion exchange reaction a non-contrast displacing agent is injected into the sample. The sample is scanned by computer X-ray microtomography and spatial distribution and concentration of the component in question is estimated by analysis of the obtained computer tomographic image of the sample.

Abstract: According to one embodiment, an X-ray computed tomography apparatus includes an X-ray tube, a detector, a first DAS, and a second DAS. The radiation detector includes a plurality of detection elements. Each detection element repeatedly detects X-rays generated by the X-ray tube and transmitted through a subject and repeatedly generates an electrical signal corresponding to the energy of the repeatedly detected X-rays. The first DAS acquires the electrical signal detected by part of the imaging region of each detection element in the integral mode. The second DAS acquires the electrical signal detected by the other part of the imaging region of each detection element in the photon count type mode.

Abstract: An X-ray CT apparatus has a scanner, a pre-scan control unit, an image generating unit, a region setting unit and a timing sensing unit. The pre-scan control unit controls an operation of the scanner to perform a pre-scan. The image generating unit generates image data of the object based upon the pre-scan. The region setting unit sets, on the basis of the image data, a region of interest, and a larger region encompassing the region of interest and a region around the region of interest and being used to determine whether or not a high pixel value region exists. The timing sensing unit senses, if the larger region does not include a pixel value higher than a first threshold, a timing to start a main scan, at which a pixel value of the region of interest exceeds a second threshold after injection of the contrast medium agent is started.

Abstract: A water-soluble salt of a metal with a high atomic weight is selected as an X-ray contrast substance providing a selective ion-exchange reaction with a clay. The salt has a general formula R+M?, where R? is selected from a group consisting of Ba2+; Sr2+; Tl+; Rb+ . . . , and M? is selected from a group consisting of Cln; NOn; OHn; CH3COO, SO4; . . . in accordance with a standard table of inorganic substances' water solubility. The X-ray contrast substance is injected into a core sample. Upon completion of the selective ion exchange reaction a non-contrast displacing agent is injected into the sample. The sample is scanned by computer X-ray microtomography and an image of the sample is obtained. An area of interest and a reference cross-section are selected at the obtained computer tomography image. Grayscale histograms in cross-sections of the sample are obtained.

Abstract: A gantry has a cylindrical shape and rotates around a subject on a top panel about the body axis. An X-ray irradiating part is arranged inside the gantry and emits an X-ray. An X-ray detector is arranged at a position facing the X-ray irradiating part and detects the X-ray transmitted through the subject. PET detectors are arranged in two separate regions facing the rotation center and detect ?-rays emitted from the positron-emitting nuclides. A moving mechanism moves the top panel and the gantry relatively to each other. An X-ray CT image generator generates an X-ray CT image of the subject based on the result of detection by the X-ray detector. A PET image generator generates a PET image of the subject based on the ?-rays detected by the PET detectors on the circumference in accordance with rotation of the gantry.

Abstract: An alternative analytical method for tomographic reconstruction in the 2D parallel-beam geometry is presented. This method may follow a filtering and backprojection scheme and may involve a global filtering in the projection domain and a local filtering in the image domain. For example, the method may include applying Hilbert filtering to the received projection data, computing an antiderivative of the filtered data, backprojecting the antiderivative into the image domain, and computing the 2D Laplacian of the backprojection image.

Abstract: A technique for 3D tomographic image reconstruction in the circular geometry (e.g., cone-based circular geometry) is disclosed. The technique may include data filtering using an initial 2D Laplace operation and a subsequent, non-local 2D filtering operation. The first filtering step thus only acts locally on the data so that it can be carried out accurately even in presence of (transaxial) data truncation. This feature may provide increased flexibility with respect to truncated projections as compared with certain standard FBP methods. Simulation studies show that the technique yields, for heavily transaxially-truncated data, an image quality that is similar to that obtained with the Feldkamp method applied with an explicit extrapolation scheme.

Abstract: Disclosed are a method for evaluating a local density profile in a carbon/carbon material and a method for producing a standard density test block capable of quantitatively evaluating the density profile in the carbon/carbon material, wherein the method for evaluating the density profile includes a first step of preparing a standard density test block to be inserted in the carbon/carbon material, wherein the standard density test block is produced by using the same type of material as the carbon/carbon material and thereafter inserted in the carbon/carbon material, a second step of radiating X-rays onto the carbon/carbon material having the standard density test block inserted so as to obtain and correct computed tomographic image, and a third step of measuring a physical density by use of a linear attenuation coefficient of the computed tomographic image, whereby the local density profile can accurately be evaluated by use of a nondestructive testing and additionally such method can be utilized as an excelle

Abstract: A radiation diagnostic apparatus includes a CT gantry apparatus, a PET gantry apparatus and a controller. The CT gantry apparatus includes an X-ray tube and an X-ray detector for reconstructing an X-ray CT image. The PET gantry apparatus includes a plurality of photodetectors for reconstructing nuclear medicine images and an FE circuit that is connected to the back of the photodetectors. The controller exerts control such that, when X-rays are radiated from the X-ray tube, the output from the photodetectors to the FE circuit is stopped or reduced.

Abstract: A method for representing an exposure to radiation of an examination area of an object caused by radiological imaging is proposed. A 3D image of the examination area of the object being examined is acquired. Absorption coefficients of the examination area are determined. The radiation exposure of the examination area caused by radiological imaging is determined and is represented in the 3D image. A termination criterion is queried. The radiation exposure of the examination area is iteratively determined till the termination criterion is fulfilled.

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 system and a method for acquiring image data of a subject with an imaging system are provided. The system can include a gantry that completely annularly encompasses at least a portion of the subject, and a source positioned within the gantry. The source can be responsive to a signal to output at least one pulse. The system can include a multi-row detector positioned within the gantry. The multi-row detector can be in alignment with the source and sets multi-row detector data based on the detected at least one signal. The system can include a flat panel detector positioned within the gantry. The flat panel detector can in alignment with the source and sets flat panel detector data based on the detected at least one signal. The system can include an image acquisition control module that determines which of the multi-row detector and the flat panel detector to use.

Abstract: A method for measuring a SPECT collimator's hole orientation angles includes (a) providing a plurality of parallel spaced apart line radiation sources at a distance from a detector; (b) positioning a first collimator between the plurality of spaced apart line radiation sources and the detector; (c) obtaining a set of line images of the plurality of line radiation sources by scanning/stepping the plurality of line radiation sources across the first collimator in a first direction; (d) obtaining a second set of line images of the plurality of line radiation sources by scanning/stepping the plurality of line radiation sources across the first collimator in a second direction thai is perpendicular to the first direction; (c) repeating the steps (c) and (d) for a second collimator, wherein one of the two collimators is a reference collimator and the other of the two collimators is a collimator being measured.

Abstract: A CT scanner which can reconstruct high-quality tomographic images using only the projected images obtained by scanning an object without requiring any special three-dimensional phantom is provided. A two-dimensional radiation sensor placed to face a radiation source via the object acquires projected images while relatively rotating the object in the radiation emitted from the radiation source. Tomographic images are obtained at one predetermined slice position of the object by performing, for each of geometrical calibration parameter values, reconstruction of a tomographic image of the object using one of the calibration parameter values based on acquired projected images. One of the calibration parameter values is selected based on the obtained tomographic images. A tomographic image is reconstructed at each slice position by using a selected calibration parameter value based on a projected image at each acquired slice position of the object.

Abstract: According to one embodiment, an X-ray CT scanner includes a gantry unit, a reconstruction unit, an extraction unit, and an output unit. The gantry unit includes an X-ray source and an X-ray detector and is configured to rotate the source and the detector. The reconstruction unit generates reconstruction image data by using data acquired by the detector. The extraction unit extracts, when using a predetermined phantom as the object, pixel values of pixels existing on a locus surrounding a tomographic image of the phantom contained in reconstruction image data generated by the reconstruction unit based on data acquired by the detector. The output unit outputs an extraction result obtained by the extraction unit or information obtained based on the extraction result.

Abstract: An in-line 4D cone beam CT reconstruction algorithm queues a limited number of projection images such that the phase determination algorithm can look-ahead. At regular intervals, the queue is scanned and those images which have enough look-ahead to obtain phase information are filtered and back-projected. The algorithm thus keeps up with the image acquisition speed and produces a 4D reconstruction within a few seconds of the end of scanning.

Abstract: A method for functional visualization and localization of an arteriovenous malformation is proposed. A patient is scanned over a predetermined projection angle range during a contrast agent uptake time. The examination region is reconstructed using the projections over the entire projection angle range. The arteriovenous malformation is localized. The multiplicity of the projections is subdivided into at least three partial projection datasets each belonging to different consecutive time windows of the total duration of the scan. A time series having tomosynthesis image datasets is generated by the partial projection datasets. An arterial and/or venous assignment of the vessels flooded with contrast agent takes place based on the time series of tomosynthesis image datasets.

Abstract: An image processing device includes a tomographic image generating section that acquires generates tomographic images, a display processing section that displays a second radiographic image, and detection section. If a region of interest is specified on the second radiographic image, the detection section performs image analysis by comparing the region of interest with corresponding regions that are regions in the tomographic images corresponding to the region of interest, and detects a tomographic image including a corresponding region that is similar to the region of interest. If a position of interest is specified on the second radiographic image, the detection section performs image analysis by comparing the position of interest with corresponding positions that are positions in the tomographic images corresponding to the position of interest, and detects a tomographic image including a corresponding position that is similar to the position of interest.

Abstract: The invention relates to a dental computed tomography apparatus which includes an x-ray imaging means and at least one colour camera for photographing the face of a patient positioned at the imaging station of the apparatus from different directions and at least one laser or a corresponding lighting arrangement, which is fitted to direct a light pattern at different locations on the face of a patient positioned at the imaging station, and a means arranged into functional connection with said at least one colour camera for creating a virtual three-dimensional surface model from the light-pattern information directed at different locations on the face of the patient positioned at the imaging station, and a means for combining said face image information detected by said at least colour camera to said surface model of the patient's face to create a virtual three-dimensional texture model of the patient's face.

Abstract: A method and a computed tomography system are disclosed for generating tomographic image datasets of a measurement object. The computed tomography system includes at least two simultaneously operable sets of detector elements which jointly scan a measurement object from a multiplicity of projection angles in an integrating manner on the one hand and an energy-resolving manner on the other hand. In at least one embodiment, the method includes determining a first projection dataset from measurement data recorded in an integrating manner. Further, at least one second projection dataset is determined from energy-resolved measurement data, and in addition a weighted tomographic result image dataset is calculated based on weighted use of the first and the second projection dataset, the weighting being applied to the projection data or the tomographic image data reconstructed therefrom.

Abstract: Portions of the radiation source are obscured so that the radiation only passes through the specific areas of the patient related to the regions-of-interest to the doctor. Scattered radiation received by detector pixels that are obscured by direct-line of sight radiation are used to estimate the scattered radiation in the un-obscured portion, which can be used to increase the accuracy of the image taken through the un-obscured portion.

Abstract: A method is provided for providing a 3D image data record relating to a biological object with suppressed aliasing artifacts overlapping the field of view caused by an incomplete geometric capture of the object by a computed tomography. A first 3D image data record is provided to describe a subarea of the object. A second 3D image data record is obtained by the computed tomography including data relating to the subarea of the object and is registered with the first 3D image data record. Data of the second 3D image data record is extended and/or amended according to data of the first 3D image data record. A part of such data of the second 3D image data record can be assigned to an aliasing artifact overlapping the field of view and thus generates a modified second 3D image data record with suppressed aliasing artifacts overlapping the field of view.

Abstract: A method of computed-tomography and a computed-tomography apparatus in which x-ray projection data is acquired at a number of views for a scan of an object. Partial images are created from data for a desired number of said views. Full scan images are created from plural ones of the partial images. Non-overlapping time images are created from the full-scan images. Gradient images are also created. An improved image is created by weighting respective ones of the full scan and non-overlapping time images using the gradient image. The improved image has increased sharpness with reduced noise.

Abstract: A method is disclosed. In at least one embodiment, the method includes obtaining an x-ray image data record with respect to the biological object by way of the x-ray image recording apparatus; obtaining a comparison image data record with respect to the biological object relating to a three-dimensional surface structure of the biological object; assigning data of the comparison image data record to data of the x-ray image data record by determining a predeterminable geometric assignment rule; and extending and/or amending data of the x-ray image data record as a function of data of the comparison image data record for at least one part of such data of the x-ray image data record, which can be assigned to an aliasing artifact overlapping the field of view.

Abstract: An imaging detector includes a scintillator having a scintillator pixel that is configured to emit light. The detector also includes a photosensor that defines a photosensor pixel that is configured to absorb light emitted by the scintillator pixel. A lens is positioned between the scintillator pixel and the photosensor pixel for directing light emitted from the scintillator to the photosensor pixel. The lens is configured to converge light emitted from the scintillator pixel toward the photosensor pixel.

Abstract: A method and system are provided for generating high resolution CT images. The NSR# method improves on the AMPR method, by increasing the in-plane image resolution of CT scanners, in the helical scanning mode. The provided method uses the quarter detector offset and interleaving of complementary data to achieve in plane image resolution that is similar to the high resolution axial scanning mode utilizing quarter detector offset and interleaving. The method includes several ways of choosing the data to be interleaved, like NSR# with two planes, NSR# with 3 planes, NSR# with multiple planes. The interleaved data are used to create high resolution tilted slices. The NSR# method optimizes the untilting filter to create a mix of high and low resolution tilted slices to achieve the desired in-plane image resolution-image artifact balance required for the imaging task. In one embodiment in the untilting process one may use only high resolution tilted slices, for maximum resolution benefit.

Abstract: There is obtained a particle beam therapy system in which the beam size is reduced. There are provided an accelerator 14 that accelerates a charged particle beam; an irradiation apparatus that has a beam scanning apparatus 5a, 5b for performing scanning with the charged particle beam and irradiates the charged particle beam onto an irradiation subject; and a beam transport apparatus 15 that has a duct for ensuring a vacuum region or gas region that continues from the accelerator 14 to a beam outlet window 7 disposed at a more downstream position than the beam scanning apparatus 5a, 5b, and that transports the charged particle beam exiting from the accelerator 14 to the irradiation apparatus.

Abstract: A method for measuring a SPECT collimator's hole orientation angles includes obtaining a set of stepped radiation line images of a line radiation source by scanning/stepping the line radiation source across a first collimator in a first direction; obtaining a second set of stepped radiation line images of the line radiation source across the first collimator in a second direction that is perpendicular to the first direction; and obtaining two sets of stepped radiation line images for a second collimator, wherein one of the two collimators is a reference collimator and the other is a collimator being measured. Calculating the collimator hole orientation angles requires determining offset distances along the two directions for each pair of lines between the reference collimator's line images and the measured collimator's line images by identifying and pairing the lines from the reference collimator line images and the measured collimator line images.

Abstract: A computed tomography apparatus and method using line data estimated from circle data and scanogram data. An image of a subject is reconstructed using the circle data and the estimated line data. The circle data and scanogram data may be weighted in estimating the line data. The apparatus and method are useful in diminishing or eliminating streak artifacts in reconstructed images such as images including the spine.

Abstract: A medical imaging system and a method electromagnetically track a position of structures with the medical imaging system and a C-arm arrangement. The medical imaging system contains a C-arm, a gantry, and at least one electromagnetic field generator assembly with at least one electromagnetic field generator which interacts with an electromagnetic sensor from receiving the electromagnetic radiation. Preferably, the electromagnetic sensor is positioned within a region of surgical interest in a patient. The electromagnetic field generator is directly embedded into the C-arm.

Abstract: A radiotherapy system comprising a support for a patient undergoing radiotherapy treatment, a gantry rotatable about an axis, a source of radiation mounted on the gantry and producing a beam of radiation directed towards a target region of the patient, a collimator coupled to said radiation source, the collimator comprising a plurality of movable, beam-limiting elements, to collectively define a shaped aperture through which the radiation beam passes, a portal imager mounted on the gantry opposite the radiation source for detecting the radiation after it has passed through the patient and generating corresponding images, and associated circuitry for controlling at least the gantry, the source, the collimator, and the portal imager, collating detected data comprising a plurality of images acquired including images at a plurality of angles of rotation of said gantry and images at a plurality of collimator shapes; generating a three-dimensional image of the target region based thereon.

Abstract: A method and apparatus for performing computed tomography in medical imaging through reconstruction of a data set containing projections obtained during relative motions a container or body of interest with respect to an x-ray source and/or x-ray detector panel. Strobing of the data is implemented through one or more methods to include pulsing of the x-ray source, intermittent blanking of the x-ray detector panel, or intermittent processing of data collected from the detector panel to simulate blanking. The invention is utilized to significantly improve contrast by taking advantage of the pulsed nature of the source to implement three-dimensional reconstruction.

Abstract: A high-resolution X-ray apparatus and a high-resolution X-ray detecting apparatus includes a plurality of multi-slice X-ray detection packs held on the pair of guide rails by detachable tight fitting members. A detachable pressing board is provided on the pair of guide rails for fixing the plurality of detection packs so that edges of adjacent detection packs contact each other.

Abstract: A method for reconstructing an image of an object includes scanning an object using a computed tomographic (CT) imaging apparatus to acquire projections of the object. A set of thresholds are determined utilizing the projections, and selected smoothing kernels are associated with the thresholds. The method further includes utilizing the smoothing kernels and the projections to produce smoothed projections in accordance with the thresholds and filtering and backprojecting the smoothed projections to generate an image of the object.