ADAPTIVE PERSISTENT CURRENT COMPENSATION FOR PHOTON COUNTING DETECTORS

摘要

An imaging system (100) includes a direct conversion detector pixel (111) that detects radiation traversing an examination region and generates an electrical signal indicative thereof, wherein the signal includes a persistent current, which is produced by a direct conversion material of the pixel and which shifts a level of the signal. A persistent current estimator (116) estimates the persistent current and generates a compensation signal based on the estimate. A pre-amplifier (112) receives the signal and the compensation signal, wherein the compensation signal substantially cancels the persistent current, producing a persistent current compensated signal, and that amplifies the compensated signal, generating an amplified compensated signal. A shaper (114) generates a pulse indicative of energy of the radiation illuminating the direct conversion material based on the amplified compensated signal.

主权项

1. An imaging system, comprising:
a first direct conversion detector pixel that detects radiation traversing an examination region and generates an electrical signal indicative thereof, wherein the generated electrical signal includes a persistent current, which is produced by a direct conversion material of the first direct conversion detector pixel and which shifts a level of the electrical signal; a persistent current estimator that estimates the persistent current produced by the direct conversion material and generates a persistent current compensation signal based on the estimate; a pre-amplifier that receives the electrical signal output by the first direct conversion detector pixel and the persistent current compensation signal, wherein the persistent current compensation signal substantially cancels the persistent current produced by the direct conversion material, producing a persistent current compensated signal, and that amplifies the persistent current compensated signal, generating an amplified persistent current compensated signal; and a shaper that generates an electrical pulse indicative of an energy level of the radiation illuminating the direct conversion material based on the amplified persistent current compensated signal.