대한핵의학회지 (1967년~2009년)
대한핵의학회지 1998;32(4)365~9
원저 : NaI ( T1 ) 섬광결정과 위치민감형 광전자증배관을 이용한 유방암 진단용 소형 감마카메라 개발 ( Development of a Small Gamma Camera Using NaI ( T1 ) - Position Sensitive Photomultiplier Tube for Breast Imaging )
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Author 김종호 , 최용 , 권홍성 , 김희중 , 김상은 , 최연성 , 이경한 , 김문회 , 주관식 , 김병태 ( Jong Ho Kim , Yong Choi , Hong Seong Kwon , Hee Joung Kim , Sang Eun Kim , Yearn Seong Choe , Kyung Han Lee , Moon Hae Kim , Koan Sik Joo , Byung Tae Kim ),
Affiliation
Abstract

Purpose: The conventional gamma camera is not ideal for scintimammography because of its large detector size ( 500 mm in width) causing high cost and low image quality. We are developing a small gamma camera dedicated for breast imaging. Materils and Methods: The small gamma camera system consists of a NaI (Tl) crystal (60 mm X60 mm X6 mm) coupled with a Hamamatsu R3941 Position Sensitive Photomultiplier Tube (PSPMT), a resister chain circuit, preamplifiers, nuclear instrument modules, an analog to digital converter and a personal computer for control and display. The PSPMT was read out using a standard resistive charge division which multiplexes the 34 cross wire anode channels into 4 signals (X, X, Y, Y ). Those signals were individually amplified by four preamplifers and then, shaped and amplified by amplifiers. The signals were discriminated and digitized via triggering signal and used to localize the position of an event by applying the Anger logic. Results: The intrinsic sensitivity of the system was approximately 8,000 counts/.'ec/pCi. High quality flood and hole mask images were obtained. Breast phantom containing 2-7 mm diameter spheres was successfully imaged with a parallel hole collimator. The image displayed accurate size and activity distribution over the imaging field of view. Conclusion: We have succesfully developed a small gamma camera using NaI(T1)-PSPMT and nuclear instrument modules. The small gamma camera developed in this study might imprnve the diagnostic accuracy of scintimammography by optimally imaging the breast. (Korean J Nucl Med 1998;32:365-73)

Keyword Small gamma camera, Breast cancer, Nal (Tl) crystal, Position sensitive photomultiplier tube
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