Development and evaluation of passive layer additive detector for stabilization in high-energy X-ray computerized tomography
| Autor: | Kyung-Min Oh, Sung-Kwang Park, Yohan Shin, Heunglae Cho, S.-U. Heo, Kyung-Hee Kim, Jee H. Jung, Y.-K. Oh, Moo-Jae Han, Jung Yeon Kim |
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| Rok vydání: | 2019 |
| Předmět: |
Photocurrent
Reproducibility High energy Materials science 010308 nuclear & particles physics business.industry Image quality Detector Insulator (electricity) 01 natural sciences 030218 nuclear medicine & medical imaging 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Parylene chemistry 0103 physical sciences Optoelectronics Tomography business Instrumentation Mathematical Physics |
| Zdroj: | Journal of Instrumentation. 14:P08015-P08015 |
| ISSN: | 1748-0221 |
| DOI: | 10.1088/1748-0221/14/08/p08015 |
| Popis: | To improve the image quality in cone-beam computerized tomography, a detector containing an insulator layer made of parylene-C was utilized in this study. In HgI2 sensors with photoconducting materials, we analyzed the signal based on the thickness of the parylene-C layer and leakage current. In addition, we tried to evaluate the reproducibility of Hgl2 that decreases gradually based on the continuous X-ray study. For the signal-to-noise ratio, we evaluated the photocurrent/darkcurrent (P/D) ratio according to the reduction in the leakage current. Our results indicated a detector reproducibility of 0.82% for a parylene-layer thickness of 18 μm, which represents an improvement of 0.43% over that of a "parylene-free" detector. Compared with the parylene-free sensors, the ones with a parylene layer displayed an approximately linear increase of the P/D ratio with increasing parylene layer thickness. For layers 18 or 20 μm thick this ratio, indicative of image quality, exhibited an improvement of ~ 70 times or more in comparison to a parylene-free sensor. |
| Databáze: | OpenAIRE |
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