Gamma | 고정식 초점형 SPECT에 있어, 선예도와 감도의 공간 균일성에 대한 평가

Evaluation of Spatial Uniformity about Resolution and Sensitivity of a‘fixed focusing type SPECT

Jaeil Kim*, Jeongjin Lim, Seongwook Cho and Kyeongwoon Noh Dept. of Nuclear Medicine, Seoul National Univ. Hospital, Seoul, Korea

Purpose : At now, there are many kind of dedicated heart SPECT machine in clinical nuclear medicine. Among those, the fixed focusing type SPECT can make a good quality, quantity image because a detectors of this SPECT arranged forward a special ROI and didn’t rotate around of body. So, in this paper, we will evaluate a spatial uniformity about resolution and sensitivity at a same plane of a fixed focusing type SPECT.

Materials and Methods : We used D-SPECT as a fixed focusing type SPECT and Cario MD as a rotated parallel type SPECT to comparing each other. We injected 99mTc(14.8MBq/1cc) to 10 capillary tube (diameter=1mm), and we set those line sources a tfield of view of each SPECT. And then we acquired SPECT date, we applied are construction by recommended methods. By using two tomography images, we calculated a full width of half maximum as a resolution and total counts as a sensitivity, and we compared a CV (coefficientofvariation) values between two images as a spatial uniformity. Results In case of D-SPECT, a CV of resolution and sensitivity are 7.45%, 12.34%. In case of Cario MD , an CV of resolution and sensitivity are 12.49%, 21.84%

Conclusion : As a results, CV of resolution and sensitivity of a fixed focusing type SPECT is 67.75%, 77.00% higher than ones of a rotated parallel type SPECT. It means that a fixed focusing type SPECT is more uniformed, because this new SPECT can reduce a motion blur artifact by rotating detector around body, also all of detector that made by semiconductor arrange forward a special FOV like heart.

Key Words : focus type SPECT, spatial resolution, sensitivity, spatial uniformity