Abstract: A center phase (image reconstruction phase) of reconstruction can be appropriately set even in a case in which motion correction is applied to reconstruct an image, to ensure a good image quality, and to support optimum phase search work by a doctor, an examination technician, or the like (hereinafter, referred to as an operator). An arithmetic operation unit that performs image reconstruction in an X-ray CT apparatus includes a motion correction reconstruction unit that detects motion information of a subject and performs motion correction reconstruction, and an image quality score calculation unit that calculates an image quality score for evaluating an image quality in one or a plurality of motion phases with respect to an image reconstructed by the motion correction reconstruction unit. An interface that can perform a phase search while comparing motion correction using the displayed image quality score is provided.

Abstract: To reduce an unnatural distortion of an image that occurs in a case in which a high absorption body of X-rays is included in movement correction image reconstruction processing of a CT image. High absorption body presence or absence determination processing of determining whether or not a high absorption body of X-rays is included is added to movement correction image reconstruction processing, and processing of limiting pixel values of an image pair used for movement correction or processing of selecting an image pair used for calculating a movement vector is performed based on a result of the determination. An X-ray CT apparatus includes a high absorption body determination unit or a pixel value adjustment unit to perform these pieces of processing.

Abstract: When motion information of a subject during scanning is acquired from an image pair and motion-corrected image reconstruction is performed to generate a CT image, erroneous recognition and excessive smoothing of a motion component are prevented, and the accuracy of motion correction is improved. A filtering unit for reducing noise of the image pair is provided. The filtering unit acquires a relation between indicators for noise amounts acquired based on information that affects noise amounts of a first image and a second image constituting the image pair, and adjusts smoothness of each image using the relation between the indicators. The presence or absence of a motion is determined for the image pair subjected to noise reduction by filtering, normalization degrees of the two images are made different according to the presence or absence of the motion and the two images are normalized, and the magnitude and a direction of the motion are detected.

Abstract: Arrangement to reduce a time until a first image is displayed, to reduce a standby time until the next imaging is started, and to uniformize a time interval in a case where a plurality of images are displayed. An X-ray CT device detects a dose of an X-ray, a storage unit that preserves image data, a calculation unit that generates, as the image data, projection data on the basis of the X-ray data in parallel to an imaging process in the scanner, preserves the projection data, notifies a display control unit of preservation information, performs a reconstruction process, a display unit that displays an image generated per the X-ray data, and the display control unit that controls a display timing of a reconstructed image to be displayed on the display unit on the basis of the preservation information and the reconstruction information.

Abstract: Arrangement to reduce a time until a first image is displayed, to reduce a standby time until the next imaging is started, and to uniformize a time interval in a case where a plurality of images are displayed. An X-ray CT device detects a dose of an X-ray, a storage unit that preserves image data, a calculation unit that generates, as the image data, projection data on the basis of the X-ray data in parallel to an imaging process in the scanner, preserves the projection data, notifies a display control unit of preservation information, performs a reconstruction process, a display unit that displays an image generated per the X-ray data, and the display control unit that controls a display timing of a reconstructed image to be displayed on the display unit on the basis of the preservation information and the reconstruction information.

Abstract: In order to provide an arithmetic device, an X-ray CT apparatus, and an image reconstruction method, capable of reducing processing time while maintaining a noise reduction effect, in a successive approximation image reconstruction method (separable paraboloidal surrogate (SPS) method) of the related art, updated images are forward-projected, whenever images are repeatedly updated, a difference between forward projection data and original object projection data is back-projected so that a difference image is obtained, and a forward projection process and a back projection process are repeatedly performed, but, in the present invention, a forward projection process and a back projection process requiring calculation time are replaced with a process requiring a relatively small calculation amount, such as a difference between an updated image and a reference image, and, as a result, it is possible to considerably reduce a calculation amount in a successive approximation image reconstruction process and to reduc

Abstract: In order to provide an arithmetic device, an X-ray CT apparatus, and an image reconstruction method, capable of reducing processing time while maintaining a noise reduction effect, in a successive approximation image reconstruction method (separable paraboloidal surrogate (SPS) method) of the related art, updated images are forward-projected, whenever images are repeatedly updated, a difference between forward projection data and original object projection data is back-projected so that a difference image is obtained, and a forward projection process and a back projection process are repeatedly performed, but, in the present invention, a forward projection process and a back projection process requiring calculation time are replaced with a process requiring a relatively small calculation amount, such as a difference between an updated image and a reference image, and, as a result, it is possible to considerably reduce a calculation amount in a successive approximation image reconstruction process and to reduc

Abstract: To provide an X-ray CT apparatus that can reduce calculation time required for an iterative approximation projection data correction process by restricting a range for the iterative approximation projection data correction process and generate low-noise images according to the examination purpose, the calculation device of the X-ray CT apparatus generates correction projection data by performing an iterative approximation projection data correction process for projection data acquired in scanning and reconstructs CT images using the correction projection data. The calculation device determines a range to which iterative approximation projection data correction process is applied based on scanning conditions and reconstruction conditions. For example, a slice direction application range is determined based on an X-ray beam width, and a channel direction application range is determined based on an FOV.

Abstract: In order to provide an X-ray CT apparatus or the like capable of improving the image quality even with low-exposure scanning by reducing artifacts generated around high absorbers on an image while reducing the amount of image noise, a reconstruction arithmetic device 221 sets the number of iterations of iterative processing for correcting projection data, and calculates, as calibration coefficients, a correction coefficient ? and an adjustment coefficient ? for adjusting the application ratio of noise reduction processing f1 and signal strength maintenance processing f2 included in the iterative processing. By performing the iterative processing including the noise reduction processing f1 and signal strength maintenance processing f2 on the projection data based on the number of iterations and the calibration coefficients ? and ?, corrected projection data is created, and a CT image is reconstructed.

Abstract: In order to provide an X-ray CT apparatus or the like capable of improving the image quality even with low-exposure scanning by reducing artifacts generated around high absorbers on an image while reducing the amount of image noise, a reconstruction arithmetic device 221 sets the number of iterations of iterative processing for correcting projection data, and calculates, as calibration coefficients, a correction coefficient ? and an adjustment coefficient a? for adjusting the application ratio of noise reduction processing f1 and signal strength maintenance processing f2 included in the iterative processing. By performing the iterative processing including the noise reduction processing f1 and signal strength maintenance processing f2 on the projection data based on the number of iterations and the calibration coefficients ? and ?, corrected projection data is created, and a CT image is reconstructed.

Abstract: In order to provide an X-ray CT apparatus and the like that can specify an optimal cardiac phase in a wide variety of cases, an X-ray CT apparatus collects X-ray information and electrocardiographic waveform data 5 by performing cardiac scanning using an scanning unit 1 (step S11). Then, reconstructed images of a plurality of cardiac phases are created (step S12), and a region-of-interest image is generated by extracting a region of interest for each of the reconstructed images of the plurality of cardiac phases (step S13). Then, a variation distribution image is generated by calculating a variation for each region-of-interest image (step S14). Then, the degree of harmony of each cardiac phase is calculated using the variation distribution image (step S15). Then, an optimal cardiac phase is determined on the basis of at least the degree of harmony (step S16).

Abstract: To provide an X-ray CT apparatus that can reduce calculation time required for an iterative approximation projection data correction process by restricting a range for the iterative approximation projection data correction process and generate low-noise images according to the examination purpose, the calculation device of the X-ray CT apparatus generates correction projection data by performing an iterative approximation projection data correction process for projection data acquired in scanning and reconstructs CT images using the correction projection data. The calculation device determines a range to which iterative approximation projection data correction process is applied based on scanning conditions and reconstruction conditions. For example, a slice direction application range is determined based on an X-ray beam width, and a channel direction application range is determined based on an FOV.

Abstract: An X-ray CT apparatus of the present invention includes an image reconstruction unit that, according to scanning conditions, acquires an irradiated X-ray image which is the distribution of the irradiation intensity of X-rays irradiated to an object by an X-ray irradiation unit, performs projection conversion of the irradiated X-ray image and a reconstructed image, and generates an exposure dose image, which is an image showing the distribution of an exposure dose of the object, and also calculates the exposure dose using the projection-converted reconstructed image and an irradiated X-ray image corresponding to a generation region of the reconstructed image.

Abstract: The medical image display device is provided with a medical image reading unit configured to read a medical image obtained by a medical image diagnostic apparatus, a projected image creating unit configured to project the medical image onto a projection plane to created the projected image, and a projected image display unit configured to display the projected image, wherein the projected image creating unit has a virtual liquid generating unit configured to generate virtual liquid, the light transmittance of which is not zero and a virtual liquid adding unit configured to add the virtual liquid to the surface of an organ within the medical image, and creates a projected image of the medical image to which the virtual liquid has been added.

Abstract: In order to provide an X-ray CT apparatus and the like that can specify an optimal cardiac phase in a wide variety of cases, an X-ray CT apparatus collects X-ray information and electrocardiographic waveform data 5 by performing cardiac scanning using an scanning unit 1 (step S11). Then, reconstructed images of a plurality of cardiac phases are created (step S12), and a region-of-interest image is generated by extracting a region of interest for each of the reconstructed images of the plurality of cardiac phases (step S13). Then, a variation distribution image is generated by calculating a variation for each region-of-interest image (step S14). Then, the degree of harmony of each cardiac phase is calculated using the variation distribution image (step S15). Then, an optimal cardiac phase is determined on the basis of at least the degree of harmony (step S16).

Abstract: An X-ray CT apparatus of the present invention includes an image reconstruction uJnit that, according to scanning conditions, acquires an irradiated X-ray image which is the distribution of the irradiation intensity of X-rays irradiated to an object by an X-ray irradiation unit, performs projection conversion of the irradiated X-ray image and a reconstructed image, and generates an exposure dose image, which is an image showing the distribution of an exposure dose of the object, and also calculates the exposure dose using the projection-converted reconstructed image and an irradiated X-ray image corresponding to a generation region of the reconstructed image.

Abstract: The medical image display device is provided with a medical image reading unit configured to read a medical image obtained by a medical image diagnostic apparatus, a projected image creating unit configured to project the medical image onto a projection plane to created the projected image, and a projected image display unit configured to display the projected image, wherein the projected image creating unit has a virtual liquid generating unit configured to generate virtual liquid, the light transmittance of which is not zero and a virtual liquid adding unit configured to add the virtual liquid to the surface of an organ within the medical image, and creates a projected image of the medical image to which the virtual liquid has been added.

Abstract: A nuclear medicine diagnosis apparatus comprising a mechanical collimator for effecting passage in a given direction of photons with given energy emitted from an object injected or dosed with a drug containing a radioactive isotope; a former-stage detector for detecting positional information at a point of reaction of photons having passed through the mechanical collimator and information on the momentum of charged particles generated by the reaction; a latter-stage detector disposed in the subsequent stage of the former-stage detector to detect information on the photons having been scattered by the former-stage detector; and image reconstruction means for reconstructing an image from detection information having been collected from the former-stage detector and latter-stage detector, wherein the image reconstruction means is built so that differentiation is carried out on the information on the photons having passed through the mechanical collimator and the information on the photons having been scattered b

Abstract: A Compton camera device according to the invention includes first means for reading coordinate data of a scattering point of a quantum ray detected by a pre-stage detector for each Compton scattering event, second means for reading coordinate data of a reaching point of the Compton-scattered quantum ray detected by a post-stage detector for each Compton scattering event, and third means for calculating a measurement accuracy of the scattered quantum ray by the first and second means for each Compton scattering event, calculating a statistical quantity of the quantum ray for each calculated measurement accuracy, and outputting the calculated statistical quantity to image reconstruction means.

Abstract: A nuclear medicine diagnosis apparatus comprising a mechanical collimator for effecting passage in a given direction of photons with given energy emitted from an object injected or dosed with a drug containing a radioactive isotope; a former-stage detector for detecting positional information at a point of reaction of photons having passed through the mechanical collimator and information on the momentum of charged particles generated by the reaction; a latter-stage detector disposed in the subsequent stage of the former-stage detector to detect information on the photons having been scattered by the former-stage detector; and image reconstruction means for reconstructing an image from detection information having been collected from the former-stage detector and latter-stage detector, wherein the image reconstruction means is built so that differentiation is carried out on the information on the photons having passed through the mechanical collimator and the information on the photons having been scattered b