Title :
Polycrystalline CdZnTe Thick Films for Low Energy X-ray: System Evaluation
Author :
Yuk, Sunwoo ; Park, Shin-Woong ; Yi, Yun
Author_Institution :
Dept. of Electron. & Inf. Eng., Korea Univ., Seoul
fDate :
Aug. 30 2006-Sept. 3 2006
Abstract :
The X-ray response of polycrystalline-CdZnTe was measured by signal-to-noise (S/N) analysis. The CdZnTe material has optimal properties in a solid-state X-ray detector, and much research has focused on single crystal CdZnTe with a small-sized, silicon readout device. However, it would be difficult to apply CdTe or CdZnTe single crystal to large area, flat panel detectors, such as those used for radiography and mammography. As an alternative of single crystal CdZnTe, we have grown thick, polycrystalline CdZnTe films of high resistivity (>5times109 Ohm cm) using the thermal evaporation method on carbon substrate. A high signal-to-noise value has a direct impact on the performance of CdZnTe X-ray detectors. Important image parameters, such as dynamic range and detective quantum efficiency, rely on the signal and noise characteristics of the system. In this paper, we analyzed the properties of the X-ray detector and obtained images of the X-ray detector using the data acquisition system. The X-ray detector used the Cd1-xZnxTe (x=0.04), which used carbon substrate and gold as the electrode. The detector design is planar and 32 mmtimes10 mm in size, and it has a 1.75mmtimes1mm pixel electrode size and a detector thickness of 150 mum
Keywords :
X-ray detection; biomedical equipment; diagnostic radiography; mammography; semiconductor counters; 150 micron; CdZnTe X-ray detector performance; carbon substrate; data acquisition system; flat panel detectors; image parameters; low energy X-ray response; mammography; noise characteristics; polycrystalline CdZnTe thick films; radiography; signal-to-noise analysis; solid-state X-ray detector; thermal evaporation method; Conductivity; Crystalline materials; Electrodes; Mammography; Radiography; Signal analysis; Silicon; Solid state circuits; Thick films; X-ray detectors;
Conference_Titel :
Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE
Conference_Location :
New York, NY
Print_ISBN :
1-4244-0032-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2006.260666