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In this work, we show a high dynamic range current-mode detector for computer tomography application. A regulated current mirror structure has been implemented at pixel level that provides with 17 bits dynamic range and a noise floor below 3 pARMS. Non-linearity is kept below 2% and signal bandwidth is higher than 10 kHz. A test structure with 4×4 pixel array is presented is this paper. Both photodiode and current mode amplifier have been integrated into the same CMOS standard process.