Abstract: A radiation imaging system includes a detector including a plurality of pixels which obtain pixel values corresponding to incident radiation transmitted through a subject, and an information processing unit configured to perform a process of estimating information on thicknesses of substances included in the subject using pixel values of an arbitrary one of the plurality of pixels, an average value of energy of radiation quanta of the arbitrary pixel calculated in accordance with the pixel values of the arbitrary pixel, a first table indicating the relationship between the pixel values of the arbitrary pixel and the thicknesses of the substances included in the subject, and a second table indicating the relationship between the average value of the energy of the radiation quanta of the arbitrary pixel and the thicknesses of the substances included in the subject.

Abstract: An image processing apparatus comprises a generating unit configured to generate, using a plurality of radiation images corresponding to mutually different radiation energies, a first material decomposition image that indicates a thickness of a first material and a second material decomposition image that indicates a thickness of a second material that differs from the first material. The generating unit generates, using the first material decomposition image and the second material decomposition image, a thickness image in which the thickness of the first material and the thickness of the second material are added together.

Abstract: A radiation imaging apparatus includes an imaging unit having a pixel array of pixels, and a signal processing unit for processing a signal from the imaging unit. Each pixel includes a conversion element for converting radiation into electrical signal and a reset unit for resetting the conversion element, the signal processing unit generates radiation image based on first image corresponding to electrical signal converted by the conversion unit of each pixel in a first period, and second image corresponding to electrical signal converted by the conversion element of each pixel in a second period which starts after start of the first period and ends before end of the first period, and in each pixel, the conversion element is not reset by the reset unit in the first period.

Abstract: An image processing apparatus generates a plurality of attenuation rate images using a plurality of radiation images corresponding to a plurality of different radiation energies obtained by irradiating an object with radiation, corrects the radiation images or the attenuation rate images so as to reduce an error of an attenuation rate caused depending on at least one of a dose of the radiation, a thickness of the object, and energy of the radiation, and generates a material characteristic image by energy subtraction processing using the plurality of attenuation rate images after the correction.

Abstract: A radiation imaging apparatus is provided. The apparatus includes a substrate in which conversion elements are arranged and which transmits light beams, a first scintillator arranged on a first surface side of the substrate, and a second scintillator arranged on a second surface side opposite to the first surface. The conversion elements include first conversion elements and second conversion elements. The first conversion elements are arranged so as to receive light beams from the first scintillator and the second scintillator. A light-shielding layer is arranged between the first scintillator and each of the second conversion elements so as to set light amounts of the second conversion elements from the first scintillator smaller than those of the first conversion elements from the first scintillator, and the second conversion elements are arranged to receive a light beam from the second scintillator.

Abstract: 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.

Abstract: An image processing apparatus comprises a planar distribution obtaining configured to, using a plurality of radiation images captured using different radiation energies as input images, obtain 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 is maximized.

Abstract: An image processing apparatus that generates a material characteristic image with use of a plurality of radiation images that have been captured with different radiation energies, comprises a combining unit that combines radiation images based on two or more radiation images that are included among the plurality of radiation images, and combines radiation spectrums based on two or more radiation spectrums of the two or more radiation images, and a generating unit that generates a material characteristic image with use of two pairs of a radiation image and a radiation spectrum obtained from the plurality of radiation images. The generating unit uses, for at least one of the two pairs, a pair of the radiation image and the radiation spectrum combined by the combining unit.

Abstract: A radiation detection apparatus includes a pixel array including pixels each including a conversion element and a switch element, an acquisition unit configured to acquire a first signal generated in the pixel array while at least one switch element of the pixels is in a conductive state, and a second signal generated in the pixel array while the switch elements are in a non-conductive state, an evaluation value determination unit configured to determine, based on the first signal, an evaluation value having a correlation with a radiation dose, a threshold value determination unit configured to determine a threshold value based not on the evaluation value but on the second signal, and a determination unit configured to determine, based on comparison between the evaluation value and the threshold value, whether the pixel array is being irradiated with radiation.

Abstract: A radiation imaging apparatus is provided. The apparatus comprises a detection unit configured to generate an image signal according to radiation emitted by a radiation source, an image processing unit, and a control unit. The control unit performs first imaging and second imaging performed after the first imaging using radiations of different energies, the image processing unit generates an energy subtraction image using a first image signal generated by the detection unit in the first imaging and a second image signal generated by the detection unit in the second imaging, and the second imaging is performed under a radiation irradiation condition according to a noise amount included in the first image signal.

Abstract: Pixel array includes pixels each including conversion element, and switch having control terminal, first primary terminal connected to the conversion element, and second primary terminal connected to one of signal lines. The pixel array includes pixel groups each including pixels arrayed to form at least 2 row×2 column pattern. In pixels of each pixel group, the control terminals are connected to different driving lines and the second primary terminals are commonly connected to one of the signal lines. In the pixel groups, first and second pixel groups are arranged adjacent to each other in column direction. Signal is read from the first pixel group via the first signal line of the single lines. Signal is read from the second pixel group via the second signal line of the single lines.

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: Radiation imaging apparatus includes pixel array having pixels, readout circuit for reading signals from the pixel array, and detector for detecting, based on radiation emitted from radiation source or information provided from the radiation source, start of radiation irradiation by the radiation source, and controller for determining timing of each of operations of sample and hold in each of the pixels each time the start of radiation irradiation is detected by the detector. The timing of at least one operation of the operations is timing in radiation irradiation period, and each of the pixels includes convertor for converting radiation into electrical signal, and sample and hold circuit for sample-holding the signal from the conversion element over plural times in accordance with the timing of each of the operations determined by the controller.

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: 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: A radiation detection apparatus includes a pixel array including pixels each including a conversion element and a switch element, an acquisition unit configured to acquire a first signal generated in the pixel array while at least one switch element of the pixels is in a conductive state, and a second signal generated in the pixel array while the switch elements are in a non-conductive state, an evaluation value determination unit configured to determine, based on the first signal, an evaluation value having a correlation with a radiation dose, a threshold value determination unit configured to determine a threshold value based not on the evaluation value but on the second signal, and a determination unit configured to determine, based on comparison between the evaluation value and the threshold value, whether the pixel array is being irradiated with radiation.

Abstract: 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.

Abstract: 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.

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.