Title :
A novel sensor for X-ray imaging applications
Author :
Giakos, George C. ; Shah, N. ; Chowdhury, Samir
Author_Institution :
Dept. of Biomed. Eng., Akron Univ., OH, USA
fDate :
4/1/2000 12:00:00 AM
Abstract :
In this study, a novel direct X-ray conversion electronic sensor for X-ray imaging, aimed at the enhancement of the signal characteristics of a cadmium zinc telluride (CdZnTe) detector substrate, is proposed. CdZnTe substrates are promising candidates in detector technology since they have a high stopping power. The novelty of the sensor lies in the material of use as well as in the signal collector design, which exhibits “Frisch-grid” capabilities. As a result, the proposed technology provides an effective mode to shield the electron-collecting electrode from the charge induced on it from moving positive ions and trapped charge. Overall, this technology would allow for a decreased sensor thickness, accompanied with a high collector efficiency, and consequently improved signal characteristics. Therefore, the signal quality of an imaging sensor as applied to medical detector technology, radio astronomy, aviation security, surveillance and nondestructive inspection, and other industrial areas will be significantly improved
Keywords :
X-ray imaging; cadmium compounds; diagnostic radiography; electric sensing devices; semiconductor materials; substrates; zinc compounds; Bridgman technique; CdZnTe; CdZnTe substrates; Frisch-grid; X-ray conversion electronic sensor; X-ray imaging; aviation security; collector efficiency; medical detector; nondestructive inspection; radio astronomy; sensor thickness; shield; signal characteristics; signal collector design; surveillance; Biomedical electrodes; Cadmium compounds; Image sensors; Sensor phenomena and characterization; Signal design; Space technology; X-ray detection; X-ray detectors; X-ray imaging; Zinc compounds;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
