Gamma | The usefulness of a 3-dimensional reconstruction method with resolutio…
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작성자 : 서울대 핵의학과 작성일2017-02-01 조회3,167회관련링크
본문
1Jong Min Seung, 2Joong Hyun Kim, 1Hyeong Jin Lee, 1Jin Eui Kim, 1Hyun Joo Kim, 1,2Jae Sung Lee,
1,2Dong Soo Lee
1Dept. of Nuclear Medicine, Seoul National Univ. Hospital
2Dept. of Nuclear Medicine, Seoul National U
Objective
The 3-dimensional reconstruction method with resolution recovery modeling has advantages of high spatial resolution and contrast because of its precise modeling of spatial blurring according to the distance from detector plane. The aim of this study was to evaluate one of the resolution recovery reconstruction methods (Astonish, Philips Medical), compare it to other iterative reconstructions, and verify its clinical usefulness.
Methods
Flanges Jaszczak ECT phantom and NEMA IEC PET body phantom (Data Spectrum Corp., USA) studies were performed using Skylight SPECT (Philips) system under four different conditions; short or long (2 times of short) distance, and half or full (105 cts/view) acquisition counts. Astonish reconstruction method was compared with two other iterative reconstructions; MLEM and 3D- OSEM which vendor supplied. For quantitative analysis, the contrast ratios obtained from IEC phantom test were compared. Reconstruction parameters were determined by optimization study using graph of contrast ratio versus background variability. The qualitative comparison was performed with Jaszczak ECT phantom and human myocardial data.
Results
For largest hot sphere of 37 mm diameter, the Astonish showed 26.5% and 18.4% higher contrast ratio than MLEM and 3D-OSEM, in short distance study. For long distance, the Astonish showed
47.3% and 38.6% higher contrast ratio than MLEM and 3D-OSEM. The effect of acquired counts was insignificant. In the qualitative studies with Jaszczak phantom and human myocardial data, the Astonish showed best image quality.
Conclusion
In this study, we have found out that the ASTONISH can provide more reliable clinical results by better image quality compared to other iterative reconstruction methods.