Patent ID: 8576292

Claim:
An imaging system comprising a photocathode, configured to be gated ON/OFF at a selected gating frequency, for converting photons from an object into electrons and selectively transmitting the electrons toward an imaging sensor, the imaging sensor, configured to receive the electrons and provide a rolling shutter read out of rows of pixels, and the imaging sensor including a variable well selectively set to charge the rows of pixels to a first intensity level during a first integration period and charge to a second intensity level during a second integration period, wherein the second integration period is longer than an OFF time of the photocathode gating frequency, the photocathode is configured to be gated OFF with a pulsed signal, denoted as a gate_off_time, the photocathode includes at least one gate_off time per frame of the imaging sensor, denoted as one gate_pulse_per_frame, and the selected gating frequency includes a time period expressed as follows: (gate_off_time/gate_pulse_per_frame) is less than the second integration period.