Aging of imaging properties of a CMOS flat-panel detector for dental cone-beam computed tomography

被引：4
作者：
Kim, D. W. [1 ]
Han, J. C. [1 ,3 ]
Yun, S. [1 ,3 ]
Kim, H. K. [1 ,2 ]
机构：
[1] Pusan Natl Univ, Sch Mech Engn, Busan 46241, South Korea
[2] Pusan Natl Univ, Ctr Adv Med Engn Res, Busan 46241, South Korea
[3] Samsung Elect Co, Suwon 16677, Gyeonggi Do, South Korea
来源：
JOURNAL OF INSTRUMENTATION | 2017年 / 12卷
关键词：
Computerized Tomography (CT) and Computed Radiography (CR); X-ray radiography and digital radiography (DR); X-RAY-DETECTOR; PHOTODIODE-ARRAY DETECTORS; ACTIVE PIXEL SENSORS; SCINTILLATING CRYSTALS; RADIATION-DAMAGE; GAIN; CT; TECHNOLOGIES; MAMMOGRAPHY; PERFORMANCE;
D O I：
10.1088/1748-0221/12/01/P01005
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
We have experimentally investigated the long-term stability of imaging properties of a flat-panel detector in conditions used for dental x-ray imaging. The detector consists of a CsI: Tl layer and CMOS photodiode pixel arrays. Aging simulations were carried out using an 80-kVp x-ray beam at an air-kerma rate of approximately 5 mGy s(-1) at the entrance surface of the detector with a total air kerma of up to 0.6 kGy. Dark and flood-field images were periodically obtained during irradiation, and the mean signal and noise levels were evaluated for each image. We also evaluated the modulation-transfer function (MTF), noise-power spectrum (NPS), and detective quantum efficiency (DQE). The aging simulation showed a decrease in both the signal and noise of the gain-offset-corrected images, but there was negligible change in the signal-to-noise performance as a function of the accumulated dose. The gain-offset correction for analyzing images resulted in negligible changes in MTF, NPS, and DQE results over the total dose. Continuous x-ray exposure to a detector can cause degradation in the physical performance factors such the detector sensitivity, but linear analysis of the gain-offset-corrected images can assure integrity of the imaging properties of a detector during its lifetime.
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页数：14
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