Canon Kabushiki Kaisha

Atsushi Iwashita

Katsuro Takenaka

Toshio Kameshima

Tomoyuki Yagi

Sho Sato

Hideyuki Okada

Kosuke Terui

Eriko Sato

Takuya Ryu

Sota Torii

Eriko Sugawara

Akira Tsukuda

Yoshiaki Ishii

Takeshi Noda

Tadao Endo

Shinichi Takeda

Shoshiro Saruta

Ryuichi Fujimoto

Takashi Takasaki

Keigo Yokoyama

Kentaro Fujiyoshi

Keiichi Nomura

Kazumi Nagano

Yohei Ishida

Yoshihito Machida

Asato Kosuge

Tomoki Komatsu

A radiation imaging apparatus includes a pixel array having a plurality of pixels configured to detect radiation, and a controller configured to obtain a radiation generation condition related to a radiation generating apparatus during fluoroscopic imaging, and determine, during the fluoroscopic imaging, timings of a plurality of sampling and holding operations in each of the plurality of pixels in accordance with the radiation generation condition. The timing of at least one sampling and holding operation is a timing in an irradiation period of radiation, and each of the plurality of pixels includes a conversion element configured to convert radiation into an electrical signal, and a sample and hold circuit configured to sample and hold signals from the conversion element multiple times in accordance with the timings, determined by the controller, of the plurality of sampling and holding operations.

Radiation imaging apparatus that determines timing of sampling and holding

An image processing apparatus performs first noise reduction processing on a plurality of radiation images corresponding to mutually-different radiation energies, generates a decomposition image by energy subtraction processing using the plurality of radiation images obtained by performing the first noise reduction processing, and performs second noise reduction processing on the decomposition image, wherein the second noise reduction processing uses a filter that differs from a filter used in the first noise reduction processing in at least one of size and type.

Image processing apparatus, image processing method, and storage medium

An image processing apparatus comprises: an image generating unit configured to generate, by using a radiation energy spectrum, a material characteristic image of a material contained in a plurality of radiation images captured by different radiation energies; and a noise reduction processing unit configured to reduce a noise component of the material characteristic image. The image generating unit uses a composite image obtained from the plurality of radiation images, a first material characteristic image in which the noise component has been reduced, and a composite spectrum obtained from spectra of the different radiation energies to generate a second material characteristic image with reduced noise.

Image processing apparatus, image processing method, and non-transitory computer-readable storage medium

An image processing apparatus includes a planar distribution obtaining unit configured, using a plurality of radiation images captured using different radiation energies as input images, to obtain, by a sequential approximation solution by an iterative calculation, an output image representing a planar distribution for a substance contained in the input image. Based on a likelihood and a prior probability using one of a pixel value of a pixel of interest or a pixel value of a peripheral pixel as an input, the planar distribution obtaining unit decides the output image such that a probability that an output is a value of the planar distribution when an input is the input image that is maximized.

Image processing apparatus, image processing method, and non-transitory computer-readable storage medium that use a plurality of captured radiation images to obtain, by sequential approximation solution by iterative calculation, an output image

An imaging control apparatus obtains a plurality of images at different radiation energies by irradiating, with radiation having different radiation energies, a subject in which at least one of a contrast agent, a guide wire, and a stent is inserted, generates an energy subtraction image by performing energy subtraction processing using the plurality of images, and generates a difference image between a mask image that is based on a plurality of energy subtraction images generated in a past and a live image that is based on a current energy subtraction image.

Radiation imaging system, imaging control apparatus, and method

An imaging control apparatus obtains a plurality of images at different radiation energies, the images having been obtained as a result of irradiating a subject with radiation whose energy changes during one shot, and detecting, a plurality of times, the radiation that has passed through the subject during the one shot; generates an energy subtraction image by performing energy subtraction processing using a plurality of images; and generates a difference image using a plurality of generated energy subtraction images.

An image processing apparatus comprises an acquisition unit for acquiring low-energy information and high-energy information from a plurality of images that are obtained by emitting radiation toward an object, a calculation unit for calculating an effective atomic number and a surface density from the low-energy information and the high-energy information, and a generation unit for generating an image that includes color information based on the effective atomic number and the surface density.

Image processing apparatus, image processing method, and program

A radiation imaging apparatus comprises a generating unit configured to generate a material characteristic image with respect to a plurality of materials included in a radiation image that has been captured using different radiation energies; and a reconstructing unit configured to set different radiation energies for the respective plurality of materials, and to generate a reconstructed image based on monochromatic radiation images of the respective materials, the monochromatic radiation images being based on the different radiation energies.

Radiation imaging apparatus, radiation imaging method, and non-transitory computer-readable storage medium

A radiation imaging apparatus that obtains a radiation image by an energy subtraction method. Each pixel includes a conversion element that converts radiation into an electrical signal and a reset portion that resets the conversion element. Each pixel performs an operation of outputting a first signal corresponding to an electrical signal generated by the conversion element in a first period, and an operation of outputting a second signal corresponding to an electrical signal generated by the conversion element in the first period and a second period. Radiation having first energy is emitted in the first period, and radiation having second energy is emitted in the second period. In each pixel, the reset portion does not reset the conversion element during a period that includes the first period and the second period.

Radiation imaging apparatus, radiation imaging system, and radiation imaging method

A radiation imaging apparatus comprises an image generating unit configured to generate a material characteristic image by using a plurality of radiation images of different radiation energy levels; an evaluation information calculation unit configured to calculate evaluation information which indicates a correlation between a plurality of material characteristic images; and a scattered ray amount estimation unit configured to estimate, based on the evaluation information, an amount of scattered rays included in the plurality of radiation images.

A radiation imaging apparatus includes a pixel array having pixels including conversion elements and switching elements, a bias line for supplying a bias potential to the conversion elements; driving lines for supplying a signal to control the switching elements, a driving unit for performing an initialization operation of supplying a driving signal to each driving line group, switching each driving signal from an OFF voltage to an ON voltage, and then returning the driving signal to the OFF voltage; an acquisition unit configured to acquire a plurality of times in each driving cycle a signal value representing a current flowing through the bias line; a calculation unit configured to calculate radiation information based on the signal values; and a determination unit configured to determine whether irradiation of the pixel array with radiation is present based on the radiation information.

Radiation imaging apparatus and radiation imaging system

A radiation imaging apparatus, comprising a sensor array in which a plurality of sensor units are arranged and a driving unit for driving the sensor array, wherein each sensor unit includes u detection element for detecting radiation and a sampling unit configured to be able to sample a signal from the detection element, the sampling unit is connected to a signal line configured to propagate a signal from the detection element, the driving unit uses the sampling unit to perform a first sampling driving operation and a second sampling driving operation to sample the signal propagating through the signal line, and the driving unit starts the second sampling driving operation before the completion of the first sampling driving operation and completes the second sampling driving operation after the completion of the first sampling driving operation.

Radiation imaging apparatus and imaging system

An image processing apparatus comprises a filtering unit for performing recursive filtering on a first signal component and a second signal component that are obtained by emitting radiation at a plurality of levels of energy toward an object, and a generation unit for generating a moving image based on the first signal component and the second signal component on which the recursive filtering is performed. A filter coefficient of the recursive filtering performed on the first signal component and a filter coefficient of the recursive filtering performed on the second signal component differ from each other.

A radiation imaging apparatus is provided. The apparatus includes an imaging unit including pixels and a control unit. Each of the pixels includes a conversion unit and a sample/hold circuit. The control unit causes the imaging unit to perform first imaging and second imaging after the first imaging to generate one energy subtraction image, and controls a timing of causing the sample/hold circuit in the first imaging to sample a first image signal obtained by the first imaging and a timing of causing the sample/hold circuit in the second imaging to sample a second image signal obtained by the second imaging in accordance with radiation irradiation conditions set in advance so as to reduce a difference between an amount of noise contained in the first image signal and an amount of noise contained in the second image signal.

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Saitama, Japan

Atsushi Iwashita