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Currently, the matrix photo-sensing devices (photosensors) are the main element of the medical digital X-ray imagers (commonly called detectors). Since the cost of a medical diagnostic mistake is very high, the requirements for a photosensor are as stringent as possible. The most important parameters are the pixel fill factor and the quantum efficiency. In the paper some of the steps taken by the authors during designing a matrix photosensor, the target area of which are biomedical X-ray studies, have been discussed. One of the goals of the mentioned design - combining different parameters, characteristic for different tasks, where either high frame rate with a reduced bit depth, or a wide dynamic range in the slow image reading mode is required. The pixel scheme and topology and also, the solution of merging four neighboring photocells into a separate functional group, which is a «super-pixel» with a large sensitive area and a potential well have been proposed. The performed calculations and modeling permit to develop the specific recommendations and requirements to a photo reading device for X-ray- sensitive panel, to determine the ranges of the frame frequency and bit rates on the transmission lines.

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