Abstract: An image processing apparatus comprises a processing unit configured to performing energy subtraction processing using information concerning a plurality of attenuation rates corresponding to a plurality of radiation energies that are different from each other and are obtained by performing imaging in which an object is irradiated with radiation. The processing unit estimates attenuation information of a decomposition target material contained in the object using at least one image obtained by the energy subtraction processing, and generates an image concerning the decomposition target material using the attenuation information and the information concerning the plurality of attenuation rates.

Abstract: An information processing apparatus obtains a plurality of results by performing energy subtraction processing for each of a plurality of sets which are sets each formed from a plurality of radiation images corresponding to different radiation energies and in which combinations of radiation energies are different, and determines a value of a predetermined parameter used in the energy subtraction processing such that a dispersion between the plurality of results is reduced.

Abstract: An image processing apparatus includes: a processing unit configured to perform noise reduction processing and material decomposition processing using a plurality of images corresponding to a plurality of different radiation energies obtained by irradiating an object with radiation and performing imaging. The processing unit generates a noise reduction image by applying filter processing for each frequency component obtained by resolving a thickness image of a material obtained by the material decomposition processing into a plurality of frequencies, and generates an image by material re-decomposition processing using the thickness image after noise reduction, which is obtained by combining the noise reduction images for each frequency component and an accumulation image obtained based on combining of the plurality of images.

Abstract: 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.

Abstract: 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.

Abstract: An image processing apparatus includes a processing unit configured to, by using a plurality of pieces of information that correspond to a plurality of mutually different radiation energies and that have been obtained by irradiating an object with radiation and performing imaging, and information regarding transmittance including scattered rays and transmittance not including the scattered rays that is set in advance for each of multiple thicknesses of a first material and a second material that is different from the first material, obtain thickness images of the first and second materials in which the scattered rays have been corrected.

Abstract: A radiation imaging apparatus includes an imaging unit having a plurality of pixels. Each of the plurality of pixels includes a conversion element configured to convert radiation into an electrical signal, a processing circuit configured to process the electrical signal output from the conversion element, and a holding unit configured to sample and hold the electrical signal output from the processing circuit. After radiation irradiation from a radiation source is started and before next radiation irradiation from the radiation source is started, the holding unit samples and holds, at a first timing and a second timing which is after the first timing, the electrical signal output from the processing circuit. A gain of the processing circuit at the first timing and the gain of the processing circuit at the second timing are different from each other.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A radiation imaging apparatus includes: a processing unit configured to obtain a plurality of images corresponding to a plurality of different radiation energies by irradiating an object with radiation and performing imaging using an energy spectrum obtained by totaling energy information obtained by dividing a time-serially obtained radiation photon energy in a time direction, and perform energy subtraction processing using the plurality of images.

Abstract: An information processing apparatus obtains a plurality of results by performing energy subtraction processing for each of a plurality of sets which are sets each formed from a plurality of radiation images corresponding to different radiation energies and in which combinations of radiation energies are different, and determines a value of a predetermined parameter used in the energy subtraction processing such that a dispersion between the plurality of results is reduced.

Abstract: An image processing apparatus includes: a processing unit configured to perform noise reduction processing and material decomposition processing using a plurality of images corresponding to a plurality of different radiation energies obtained by irradiating an object with radiation and performing imaging. The processing unit generates a noise reduction image by applying filter processing for each frequency component obtained by resolving a thickness image of a material obtained by the material decomposition processing into a plurality of frequencies, and generates an image by material re-decomposition processing using the thickness image after noise reduction, which is obtained by combining the noise reduction images for each frequency component and an accumulation image obtained based on combining of the plurality of images.

Abstract: 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.

Abstract: 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.

Abstract: An image processing apparatus includes: a generation unit configured to generate a first image representing a thickness of a first material and a second image representing a thickness of a second material different from the first material using a plurality of images obtained based on a first combination of different radiation energies, and to generate a third image representing the thickness of the first material and a fourth image representing the thickness of the second material using a plurality of images obtained based on a second combination of different radiation energies; and an obtaining unit configured to obtain, using one of the first image and the second image and one of the third image and the fourth image, an enhanced image in which a third material different from the first material and the second material is enhanced.

Abstract: 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.

Abstract: An image processing apparatus comprises a processing unit configured to performing energy subtraction processing using information concerning a plurality of attenuation rates corresponding to a plurality of radiation energies that are different from each other and are obtained by performing imaging in which an object is irradiated with radiation. The processing unit estimates attenuation information of a decomposition target material contained in the object using at least one image obtained by the energy subtraction processing, and generates an image concerning the decomposition target material using the attenuation information and the information concerning the plurality of attenuation rates.

Abstract: A radiation imaging apparatus including: a first scintillator layer configured to convert a radiation (R) which has entered the first scintillator layer into light; a second scintillator layer configured to convert a radiation transmitted through the first scintillator layer into light; a fiber optic plate (FOP) provided between the first scintillator layer and the second scintillator layer; and an imaging portion configured to convert the light generated in the first scintillator layer and the light generated in the second scintillator layer into an electric signal.