TY - JOUR
T1 - Examination of PbI2 and HgI2 photoconductive materials for direct detection, active matrix, flat-panel imagers for diagnostic X-ray imaging
AU - Kang, Yixiu
AU - Antonuk, Larry E.
AU - El-Mohri, Youcef
AU - Hu, Larry
AU - Li, Yixin
AU - Sawant, Amit
AU - Su, Zhong
AU - Wang, Yi
AU - Yamamoto, Jin
AU - Zhao, Qihua
N1 - Funding Information:
Manuscript received November 15, 2003; revised September 7, 2004. This work was supported by the National Institutes of Health under Grants R01-EB000558, R01-CA76405, and R01-CA51397. The authors are with the Department of Radiation Oncology, University of Michigan, Ann Arbor, MI 48109 USA (e-mail: antonuk@umich.edu). Digital Object Identifier 10.1109/TNS.2004.843135
PY - 2005/2
Y1 - 2005/2
N2 - In this paper, the results of empirical studies of the dark current and X-ray signal response of thick, polycrystalline films of lead iodide (FbI 2) and mercuric iodide (HgI2) are reported. These studies are being carried out as part of an extensive, integrated program of research to develop and incorporate such photoconductive, X-ray detection materials into direct detection, active matrix flat-panel imagers (AMFPIs) for applications in diagnostic imaging, as well as for radiotherapy imaging. Simple detector configurations incorporating these materials were prepared by physical vapor deposition (PVD) with thicknesses ranging from approximately 90 to 500 μm. For these detectors, the temporal behavior of the dark current and of the X-ray-induced photocurrent, under irradiation conditions relevant to fluoroscopy, radiography and mammography, were quantitatively examined and are reported. In addition, X-ray sensitivity results are also presented for a variety of conditions. The measurements were performed for externally applied electric fields ranging from 0.2 to 2.0 V/μm for both negative and positive polarities.
AB - In this paper, the results of empirical studies of the dark current and X-ray signal response of thick, polycrystalline films of lead iodide (FbI 2) and mercuric iodide (HgI2) are reported. These studies are being carried out as part of an extensive, integrated program of research to develop and incorporate such photoconductive, X-ray detection materials into direct detection, active matrix flat-panel imagers (AMFPIs) for applications in diagnostic imaging, as well as for radiotherapy imaging. Simple detector configurations incorporating these materials were prepared by physical vapor deposition (PVD) with thicknesses ranging from approximately 90 to 500 μm. For these detectors, the temporal behavior of the dark current and of the X-ray-induced photocurrent, under irradiation conditions relevant to fluoroscopy, radiography and mammography, were quantitatively examined and are reported. In addition, X-ray sensitivity results are also presented for a variety of conditions. The measurements were performed for externally applied electric fields ranging from 0.2 to 2.0 V/μm for both negative and positive polarities.
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U2 - 10.1109/TNS.2004.843135
DO - 10.1109/TNS.2004.843135
M3 - Article
AN - SCOPUS:20244374256
VL - 52
SP - 38
EP - 45
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
SN - 0018-9499
IS - 1 I
ER -