Toshiba Medical Systems Corporation

The State University of New York

Canon Medical Systems Corporation

Amit Jain

Joseph Manak

Takuya Sakaguchi

Hisato Takemoto

Stephen Rudin

Daniel R Bednarek

Haruki Iwai

Ciprian Nicolae Ionita

Seiichirou Nagai

A method and apparatus is provided to generate two X-ray projection images, using different focal-spot sizes in the X-ray source. The large and small focal-spot images have different image qualities (e.g., different signal-to-noise rations (SNR) and different resolution). The two images are combined, in either the spatial or frequency domains, to generate a combined image, exhibiting the best attributes of the constitutive small and large focal-spot images. In the spatial domain, change regions and uniform regions are determined based on spatial variations within the images, and the superposition generating the combined image weights the small focal-spot image more in the change regions and the large focal-spot image more in the uniform regions. In the frequency domain, the combined image superimposes low-frequency components of the large focal-spot image with high-frequency components of the small focal-spot image.

Image combining using images with different focal-spot sizes

An X ray diagnostic apparatus includes an X ray tube generating X rays, a first detector detecting the X rays, at least one second detector arranged in front of a first detection surface of the first detector and including a second detection surface narrower than the first detection surface and indicator points provided on a rear surface of the second detection surface, a projection data generation unit generating first projection data based on an output from the first detector, and a positional shift detection unit detecting a positional shift of the second detector relative to the first detector in accordance with an imaging direction by using the first projection data and a predetermined positional relationship between the points and detection elements in the second detector.

X-ray diagnostic apparatus and medical image processing method

An apparatus for generating corrected X-ray projection data from target X-ray projection data obtained by performing an X-ray scan with a detector having an anti-scatter grid, and a method for creating a lookup table and generating corrected X-ray projection data. The apparatus includes a detector configured to detect incident X-rays, an anti-scatter grid configured to suppress scattered radiation incident on the detector, and an X-ray source configured to irradiate the target with X-rays. Processing circuitry is configured to cause the X-ray source to scan, using a peak kilovoltage (kVp), the target to produce the target projection data, determine a patient-to-detector distance (PDD) and an area irradiated (FS), transform the target projection data into a spatial frequency domain, determine scatter values by accessing the lookup table using the kVp, PDD, and FS values, and subtract the scatter values from the frequency components to obtain the corrected X-ray projection data.

Method for estimation and correction of grid pattern due to scatter

A radiography apparatus includes a radiation source, a radiation detector, and processing circuitry. The processing circuitry is configured to obtain an X-ray image of an object, obtain a focal spot size of a radiation source used to generate the obtained X-ray image, and estimate a magnification of the obtained X-ray image. The processing circuitry is also configured to obtain, using a look-up table and the obtained focal spot size, a deconvolution kernel. The processing circuitry is also configured to generate a corrected X-ray image by performing a deconvolution operation on the obtained X-ray image using the obtained deconvolution kernel and the estimated magnification.

Focal spot de-blurring

An X-ray diagnostic apparatus according to an embodiment includes an X-ray tube, a detector, an acquisition circuitry, and imaging control circuitry. The acquisition circuitry creates photon count data indicating the number of photons of the X-rays incident on the detector, for each of a plurality of energy bins for identifying a plurality of target substances, based on the detection signal output by the detector. The imaging control circuitry determines an imaging plan including at least one of a setting condition that is a condition concerning setting of a plurality of energy bins used when the acquisition circuitry creates photon count data in main imaging, and an X-ray radiation condition that is a condition concerning X-rays emitted by the X-ray tube in main imaging, based on the photon count data created by the acquisition circuitry or image data of the subject.

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Amherst, NY, United States of America

Amit Jain