Imaging devices systems and methods

摘要

An imaging device comprises a semiconductor substrate including an array of pixel cells 18. Each pixel cell comprises an individually addressable active charge storage circuit 20 integral to the semiconductor substrate 16 for accumulating charge resulting from radiation IR incident on the pixel cell. Control electronics can include addressing logic for addressing individual pixel cell active charge storage circuits for reading accumulated charge from the active charge storage circuit of a selected pixel cell. Imaging optimisation can be achieved by determining maximum and minimum charge values for pixels for display, assigning extreme grey scale or colour values to the maximum and minimum charge values and allocating grey scale or colour values to an individual pixel according to a sliding scale, between the extreme values. Scattered radiation can be detected and discarded by comparing the detected pixel value to a threshold value related to a minimum detected charge value expected for directly incident radiation and discarding detected pixel values less than said threshold value. The device may be used in medical X-ray imaging.