Gamma | Comparison of image uniformity due to position shifting in COR on myoc…
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작성자 : 서울대 핵의학과 작성일2017-02-01 조회2,981회관련링크
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1Hyun Jin Lim, 2JoongHyunKim,1JaeIlKim,1JungJinLim,1JinEuiKim,1HyunJooKim,
1,2Jae Sung Lee , 1,2DongSooLee
1Dept. of Nuclear Medicine, SeoulNationalUniv.Hospital
2Dept. of Nuclear Medicine, Seoul National U
Purpose It is important to acquire accurate data because the SPECT Scan affected
by various physical factors. The aim of this study was to compare the uniformity
when both centers were matched or mismatched differed from position of heart in
COR.
Materials and methods The images were acquired with cylindrical Uniform phantom
(6.7 cm diameter, 9 cm length) and heart insert phantom using Cardio MD SPECT
system (Philips, U.S.A). The phantoms were positioned on COR as well as four
different points which were 10 cm above, below, left and right side from the COR.
The counts from the both edge of cylindrical uniform phantom and those from the
both wall of heart insert phantom were compared by using vertical and horizontal line
profile. In addition, the qualitative evaluation was performed with heart insert phantom
images and volunteer test.
Result The differences of counts were 1.1%, 4.1%, 4.9%, 2.2% and 0.9% at COR,
10cm above, below, left and right side from COR in order for cylindrical uniform
phantom and 0.8%, 14.4%, 4.5%, 7.3% and 7.2% for heart insert phantom. For
qualitative evaluation, the images at COR were the most uniform for both of heart
insert phantom and volunteer test, whereas other four positions showed somewhat
distorted images.
Conclusion It showed the most uniform images when COR is matched with the heart.
Therefore, we can expect that distortion which increased or decreased of myocardial
perfusion will be prevented by matching the heart and COR when positioning.
Furthermore, the accuracy of diagnosis will be improved as well.