32-slice CT sensor chip with photodiodes and readout circuit The AS5951 is a cost-optimized sensor chip for 32-slice CT detectors that combines the photodiodes with a pixel dimension of 0.98x0.98 mm² and the readout circuit on a single CMOS chip. This sensor solution, where the photodiode array and a 128-channel ADC are side-by-side, allows the assembly of the pixel array on three adjacent edges of the device. Improved performance can be achieved due to superior dark current, noise and power consumption.