Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)
- Volume 18 Issue 3
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- Pages.291-299
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- 1997
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- 1229-0807(pISSN)
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- 2288-9396(eISSN)
Design and Performance Evaluation of Small Size Counting and Imaging Gamma Probe System
소형 계수용 및 영상용 감마프로브 시스템의 설계와 성능평가
- Yang, Myo-Geun (Dept. of Nuclear Medicine, College of Medicine, Seoul National University) ;
- Kwark, Cheol-Eun (Dept. of Nuclear Medicine, College of Medicine, Seoul National University) ;
- Sim, yong-Geol (Dept. of Electronics Engineering, Dankook University) ;
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Kim, Hee-Joung
(Dept. of Radiology, College of Medicine, Yonsei University) ;
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Choi, Yong
(Dept. of Nuclear Medicine, Samsung Medical Center) ;
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Chung, Jung-Key
(Dept. of Nuclear Medicine, College of Medicine, Seoul National University) ;
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Lee, Myung-Chul
(Dept. of Nuclear Medicine, College of Medicine, Seoul National University) ;
- Koh, Chang-Soon (Dept. of Nuclear Medicine, College of Medicine, Seoul National University)
- 양묘근 (서울대학교 의과대학 핵의학교실) ;
- 곽철은 (서울대학교 의과대학 핵의학교실) ;
- 심용걸 (단국대학교 공과대학 전자공학과) ;
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김희중
(연세대학교 의과대학 방사선과학교실) ;
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최용
(삼성의료원 핵의학과) ;
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정준기
(서울대학교 의과대학 핵의학교실) ;
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이명철
(서울대학교 의과대학 핵의학교실) ;
- 고창순 (서울대학교 의과대학 핵의학교실)
- Published : 1997.09.01
Abstract
As a microimaging device detecting gamma rays emitted from small lesions or tumors during operation, the intraoperative surgical probe has been proposed and is now under development. We have designed a multipurpose portable gamma prove system and evaluated the performance both for the absolute counting purpose of residual radioactivities and for the localizing capability of gamma events using the NaI(Tl) crystal and two types of photomultiplier tubes(PMTs). Counting efficiencies in the range of routine clinical use of radiation dose were measured using the assembly of single channel PMTs and 0.5 inch thick NaI(Tl) crystal of 1 inch diameter. The positioning of gamma events for imaging purpose requires the multiple channel PMTs with appropriate positioning electronics. We have designed a simple and reliable positioning circuit based on the concept of modified Anger. In preliminary experiments using the multiple channel PMT of 3 inch diameter and the dim lighth source, we were able to trace and localize the correct position with reduced positioning error by the use of two multiplier/divider chipset and simplified peripherals. The energy resolutions for the counting gamma probe measured as full width at half maximum(FWHM) for Cs-137, F-18, Tc-99m were 12%, 13%, and 36%, respectively. The spatial resolution for the imaging gamma probe measured as FWHM for green LED was 2.9 mm. The results indicate that the currently developing probe is very promising and could be very useful for many applications in nuclear medicine. Future studies will include developing collimators, improving interface hardwares, and evaluating the system with clinical data.