Increasing signal to noise ratio of solid state image sensor with selectable individual pixel access

摘要

The method increases the signal-to-noise ratio of a solid sate image sensor to which radiation esp. X-ray radiation is applied, with selectable individual pixel access. The pixel signals generated and/or varied by an illumination charge generation are read out and are stored in an image memory for further processing. During the illumination process the pixel signals of at least part of the image sensor pixels are read out by resetting the pixel charge memory in the frame of a first scanning and are out into the image memory. The signals held in the memory are combined with further pixel individual signals read out after the illumination to generate a summed image.