A radiographic image capturing system includes the following. A radiographic image capturing apparatus includes a two-dimensional array of radiation detecting elements and a control circuit which controls reading of image data from each of the radiation detecting elements based on a predetermined capturing sequence. An image processor has first gain data to correct gains of the radiation detecting elements, and generates a radiographic image based on the corrected image data. The control circuit of the radiographic image capturing apparatus is capable of varying at least one of a reverse bias voltage and a signal line voltage to be applied to the corresponding signal line. The control circuit reads a signal value from each of the radiation detecting elements, creates second gain data based on the read signal value, and corrects the radiographic image with the first gain data and the second gain data.

A portable radiographic capturing apparatus includes: a detecting unit provided with a two-dimensional array of radiation detecting elements accumulating charges in proportion to a dose of radiation; and a control unit which controls accumulation of the charges by the radiation detecting elements and reading of the accumulated charges therefrom, the charges being in proportion to the dose of radiation emitted as pulsed radiation from a radiation source and transmitted through a subject, to generate plural frame images of the subject, wherein the control unit obtains waveform information on the emitted radiation by causing at least some of the radiation detecting elements to accumulate the charges in proportion to the radiation preliminarily emitted from the radiation source for adjustment and by reading the accumulated charges, and adjusts a control condition for generation of the frame images of the subject on the basis of the obtained waveform information.

A method for correction of an x-ray image recorded with an x-ray device with an anti-scatter grid for effects of the anti-scatter grid is provided. The anti-scatter grid has a spatially periodically repeating geometrical embodiment, and a calibration image recorded without an imaging object is used. The calibration image and the x-ray image are transformed by a transformation into the position frequency space. In the position frequency space, adaptation parameters describing changes of the calibration image optimizing a measure of matching between the x-ray image and the calibration image are established. For correction, the adapted calibration image is subtracted from the x-ray image, and the x-ray image is transformed back into the position space again using an inverse of the transformation.

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.

In capturing an image of a grid by an image detector, a measurement pixel that is not in the position of a specific point having a maximum or minimum value of an output signal is referred to as a first measurement pixel, and a measurement pixel that is in the position of the specific point is referred to as a second measurement pixel. The disposition of the first and second measurement pixels are determined so as to satisfy the following condition: fG/fN≠odd number, wherein fG is a grid frequency and fN is a Nyquist frequency of pixels; and in shifting the grid C times by one pixel, the number of the first measurement pixels is larger than that of the second measurement pixels at any time in the range of a cycle C of a repetition pattern appearing in the image.

A radiographic image capturing system includes: a radiation irradiating apparatus which emits radiation and provides notification of radiation emission while emitting the radiation; a radiographic image capturing apparatus which includes two-dimensional matrix radiation detecting elements and reads electric charges accumulated in the radiation detecting elements as image data; an exposure switch capable of two-step manipulations, the exposure switch transmitting an activation signal in response to a first-step manipulation and transmitting a radiation start signal in response to a second-step manipulation; a signal transceiver which receives the activation signal and transfers the received activation signal to the radiation irradiating apparatus; and a delay time calculating device which calculates, as a delay time, a difference between a time of reception of the activation signal at the signal transceiver and a time of start of the notification of radiation emission at the radiation irradiating apparatus.

An apparatus for determining material property, includes: an interface configured to obtain a first HU value associated with a first image of an object, and to obtain a second HU value associated with a second image of the object, wherein the first image is created using a first energy having a first energy level, and wherein the second image is created using a second energy having a second energy level that is different from the first energy level; and a processing unit configured to determine a weighted property value for the object based at least in part on the first HU value and the second HU value.

The present invention relates to an X-ray detector comprising a directly converting semiconductor layer (60) having a plurality of pixels for converting incident radiation into electrical measurement signals with a band gap energy characteristic of the semiconductor layer, wherein said incident radiation is x-ray radiation emitted by an x-ray source (2) or light emitted by at least one light source (30, 33). Further, an evaluation unit (67) is provided for calculating evaluation signals per pixel or group of pixels from first electrical measurement signals generated per pixel or group of pixels when light from said at least one light source at a first intensity is coupled into the semiconductor layer and second electrical measurement signals generated per pixel or group of pixels when light from said at least one light source at a second intensity is coupled into the semiconductor layer, wherein said evaluation unit is configured to detect per pixel or group of pixels a noise peak in said first and second electrical measurement signals and to determine offset and gain per pixel or group of pixels from the detected noise peaks. A detection unit (69) is provided for determining detection signals from electrical measurement signals generated when x-ray radiation is incident onto the semiconductor layer, and a calibration unit (68) is provided for calibrating the detection unit on the basis of the evaluation signals.

An image detector is disposed behind a grid. The image detector has normal pixels and measurement pixels. Out of a group of measurement pixels based on which an average value of dose measurement signals is calculated, a [C/D] number of measurement pixels are disposed or chosen in a cycle Z=(R×C)±D. Wherein, C represents a cycle of a repetition pattern appearing in an arrangement direction of X-ray transparent layers and X-ray absorbing layers in an X-ray image of the grid, and is represented in units of the number of pixels. R represents a natural number of 0 or more. D represents an integer less than the cycle C. [C/D] represents a maximum integer equal to or less than C/D. Provided that at least the [C/D] number of measurement pixels are shifted C occasions by one pixel, if D=1, the average value of the dose measurement signals is invariable without any variations.

In order to provide a data processing device and the like, capable of performing highly accurate reference correction even in a case where an object protrudes in reference channels in most of the measurement views, an image processing device (data processing device) of an X-ray CT apparatus calculates a unit air calibration reference value which is a value per unit tube current of an air calibration reference value which is reference data measured during air calibration, calculates a reference value (estimated reference value) corresponding to an X-ray condition in the main scanning on the basis of an output tube current value in the main scanning and a unit air calibration reference value, and corrects normalized reference data obtained by normalizing a measured reference value in the main scanning with the estimated reference value, to be included in an allowable error range, so as to remove the influence of protrusion.