| 학회 | 한국재료학회 |
| 학술대회 | 2014년 가을 (11/27 ~ 11/28, 대전컨벤션센터) |
| 권호 | 20권 2호 |
| 발표분야 | A. 전자/반도체 재료(Electronic and Semiconductor Materials) |
| 제목 | An assessment of the possibility of developing an intrinsic silicon-based automatic exposure control by way of Monte Carlo simulation and characteristics evaluation |
| 초록 | To improve the image quality and reduce the exposure dose of radiography, many studies are underway in connection with ‘image receptor’, ‘automatic exposure control’ and so on. The use of automatic exposure control that is able to control image concentration consistently is highly recommended. Currently, semiconductor sensors are difficult to manufacture and likely to cause performance degradation after being used for many hours. Thus, there is the necessity to develop a high efficiency sensor which can be manufactured by way of simplified manufacture process. Thus the author of this paper simulated the transmission probability of conventional sensors and evaluated the characteristics of the intrinsic silicon manufactured using a floating zone method and of conventional sensors. At this time, the current author of this paper controlled the thickness of aluminum at the level of 5000 Å at the temperature of 350 ℃ or above by way of physical vapor deposition method using electrode for collecting electron-hole pair. In this study, critical elements were limited to ‘transmission efficiency’, ‘shading image’ and ‘energy dependence’ of various requirements for the sensor of automatic exposure control. To simulate the transmission efficiency, silicon 350 μm was used as suggested by the National Institute of Standards and Technology in the USA and 40 kVp - 120 kVp of the diagnostic energy suggested by SRS-78 program was implemented at the interval of 20 kVp. In addition, to analyze the results of the simulation, both the transmission efficiency of the manufactured sensor and of the conventional sensor were derived. Magicmax Universal manufactured by iba was used to calculate the energy dependency which is one of critical elements; the exposure dose reaching the sensor was controlled at 1.5mGy/rate; and the relative values to tube voltage on the basis of the electrical signal for 80 kVp were derived. Lastly, to evaluate the shading image, the shading images of the manufactured sensor and the conventional sensor were obtained using the digital image receptor of DRTech and the contrast of shade was derived using image j program. The results showed that general diagnostic energy have the transmission efficiency of higher than 89.4%. Also, the shading image was tested. In the conventional sensor, it did not appear at 40 kVp whereas it appeared as 0.036 in the manufactured sensor. Thus it is essential that future studies address how to minimize the shading effect from various angles to use the manufactured sensor as an automatic exposure control. |
| 저자 | Kyo-Tae Kim1, Jeong-Eun Park2, Jin-Seon Kim3, Ye-Ji Heo2, Kyung-Min Oh3, Jung-Wook Shin2, Ji-Koon Park3, Sang-Hee Nam2 |
| 소속 | 1Dept. of Hybrid Medicine and Science, 2Inje Univ., 3Dept. of Biomedical Engineering |
| 키워드 | Automatic Exposure Control Sensor; Intrinsic Silicon; Transmission rate; shading Image; Energy dependency |
