Hitachi Medical Corporation

Hitachi, Ltd.

Ryota Kohara

Tetsuo Nakazawa

Takashi Shirahata

Yuta Ogura

Osamu Miyazaki

Tsuyoshi Suzuki

Hiroto Kokubun

Nobutaka Abe

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.

X-ray CT device and image display method for parallel imaging process and reconstruction process based on data-preservation process

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 reduce processing time.

Arithmetic device, X-ray CT apparatus, and image reconstruction method

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. The calculation device performs an iterative approximation projection data correction process for projection data corresponding to the determined application range to generate correction projection data.

X-ray CT apparatus and image reconstruction method

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 devicesets the number of iterations of iterative processing for correcting projection data, and calculates, as calibration coefficients, a correction coefficient &#x3b2; and an adjustment coefficient &#x3b1; for adjusting the application ratio of noise reduction processing fand signal strength maintenance processing fincluded in the iterative processing. By performing the iterative processing including the noise reduction processing fand signal strength maintenance processing fon the projection data based on the number of iterations and the calibration coefficients &#x3b1; and &#x3b2;, corrected projection data is created, and a CT image is reconstructed.

X-ray CT apparatus, reconstruction arithmetic device, and reconstruction arithmetic method

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 databy performing cardiac scanning using an scanning unit(step S). Then, reconstructed images of a plurality of cardiac phases are created (step S), 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 S). Then, a variation distribution image is generated by calculating a variation for each region-of-interest image (step S). Then, the degree of harmony of each cardiac phase is calculated using the variation distribution image (step S). Then, an optimal cardiac phase is determined on the basis of at least the degree of harmony (step S).

X-ray CT apparatus and optimal cardiac phase determining method

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.

X-ray CT apparatus

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.

Medical image display device and medical image display method

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 by the former-stage detector and that the image reconstruction is carried out by different image reconstruction algorithms from the individual differentiated detection information.

Nuclear medicine diagnosis apparatus

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.

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Tokyo, Japan

Ryota Kohara