JP2008229194A5 - - Google Patents

Claims (8)

  An X-ray source for irradiating the subject with X-rays, and an X-ray flat panel detector comprising a plurality of two-dimensionally arranged X-ray detection elements arranged opposite to the X-ray source and detecting transmitted X-rays of the subject An X-ray irradiation area setting means for setting an X-ray irradiation area on the subject, an X-ray diaphragm means for focusing X-rays on the X-ray irradiation area set by the X-ray irradiation area setting means, and the subject A grid provided at the front of the X-ray flat panel detector that prevents the generated scattered X-rays from entering the X-ray flat panel detector, and the offset, gain, and defective pixel of each pixel of the X-ray flat panel detector X-ray flat panel detector correcting means for correcting pixel values, and moire reducing means for reducing moire generated due to interference between the pixel pitch of the pixels of the X-ray flat detector and the density of the grid. In the diagnostic imaging apparatus, the moire reduction means is the X-ray. X-ray image diagnosis apparatus characterized by comprising a filtering means for a predetermined weighting on the corrected defective pixel area detector correcting means.   2. The X-ray image diagnosis apparatus according to claim 1, wherein the correction area of the pixel corrected by the X-ray flat panel detector correction means is an X-ray irradiation field area formed by the X-ray diaphragm means.   The X-ray flat panel detector correcting means includes defective pixel detecting means for detecting a defective pixel by scanning in the X direction of the correction area in two dimensions of the X direction and the Y direction in the X-ray irradiation field area. The X-ray image diagnosis apparatus according to claim 2, wherein the apparatus is an X-ray image diagnosis apparatus.   The image forming apparatus further includes a reduced image forming unit that forms an image to be reduced by thinning out pixels of the entire image detected by the X-ray flat panel detector, and the reduced image forming unit is configured to calculate the image from all image data of the X-ray irradiation field region. Decimation number determining means for determining a decimation number for forming an image area to be reduced corresponding to the long axis of the X-ray irradiation field, and detecting the X-ray plane by shifting pixels decimation based on the decimation number Correction area setting means for setting the correction area of the detector, means for correcting the pixels in the correction area set by the correction area setting means by the X-ray flat panel detector correction means, and the pixel value corrected by the correction means The X-ray diagnostic imaging apparatus according to claim 3, further comprising moire reduction means for reducing moire by the filter processing means.   The correction of the defective pixels is performed for pixels in a line one line away in the X direction, which is one times the thinning number, and the moire reduction is performed by weighting pixels in a line two lines away from the thinning number. The X-ray image diagnostic apparatus according to claim 4.   The X-ray image diagnosis apparatus according to claim 5, wherein the reduced image is an image to be previewed by reducing all images detected by the X-ray flat panel detector. The entire part of the image to automatically cut and the automatic trimming image forming to be processed, in any one of claims 1 to 3, characterized in that it comprises the moire reduction means in this form the cropped image The X-ray diagnostic imaging apparatus described. It said filter predetermined weighting processing means, X-rays image diagnostic apparatus according to any one of claims 1 to 7, characterized in that a positive non-zero value.