Investigation of lag and ghosting in amorphous selenium flat-panel x-ray detectors

Wei Zhao; Giovanni DeCrescenzo; John A. Rowlands

doi:10.1117/12.465557

3 May 2002 Investigation of lag and ghosting in amorphous selenium flat-panel x-ray detectors

Wei Zhao, Giovanni DeCrescenzo, John A. Rowlands

Proceedings Volume 4682, Medical Imaging 2002: Physics of Medical Imaging; (2002) https://doi.org/10.1117/12.465557
Event: Medical Imaging 2002, 2002, San Diego, California, United States

Abstract

Our goal is to understand the temporal response of amorphous selenium (a-Se) x-ray imaging detectors. The temporal response caused by charge trapping and release gives rise to the imaging properties of lag and ghosting. These imaging properties depend on both the design and operational parameters of the detectors as well as the material properties of a-Se. Our approach was to measure the x-ray photocurrent of electroded a-Se detectors as a function of x-ray exposure and correlate these measurements with an experimental investigation of charge trapping by use of the 'time-of-flight' method. These experimental results are compared with models based on previously published values of material properties such as electron and hole trapping and recombination cross-sections. The resulting model can be used to predict lag and ghosting in radiographic and fluoroscopic flat panel detectors. We also investigated the effect of charge trapping between the pixel electrodes of an a-Se flat-panel detector on lag and ghosting. Our method for quantitative evaluation of lag and ghosting in a-Se will facilitate the optimization of imaging performance. This is achieved by determining the combination of materials properties, system design and operational parameters which minimize artifacts arising from either lag or ghosting in a-Se flat-panel detectors.

Citation Download Citation

Wei Zhao, Giovanni DeCrescenzo, and John A. Rowlands "Investigation of lag and ghosting in amorphous selenium flat-panel x-ray detectors", Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); https://doi.org/10.1117/12.465557

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