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KMID : 1143620190230010054
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Korean Journal of Nuclear Medicine Technology
2019 Volume.23 No. 1 p.54 ~ p.58
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Evaluation of Spatial Uniformity about Resolution and Sensitivity of a 'fixed focusing type SPECT'
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Kim Jae-Il
Lim Jung-Jin
Cho Seong-Wook
Noh Kyeong-Woon
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Abstract
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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.
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KEYWORD
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focus type SPECT, spatial resolution, sensitivity, spatial uniformity
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