PET/CT 3차원 영상 획득에서 부분용적효과 감소를 위한 재구성법의 최적화

• 영문명: The Optimization of Reconstruction Method Reducing Partial Volume Effect in PET/CT 3D Image Acquisition
• 발행기관: 대한핵의학기술학회
• 저자명: 홍건철(Gun Chul Hong) 박선명(Sun Myung Park) 곽인석(In Suk Kwak) 이혁(Hyuk Lee) 최춘기(Choon Ki Choi) 석재동(Jae Dong Seok)
• 간행물 정보: 『핵의학기술』Vol.14 No.1, 13~17쪽, 전체 5쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2010.06.30

영문 초록

Purpose: Partial volume effect (PVE) is the phenomenon to lower the accuracy of image due to low estimate, which is to occur from PET/CT 3D image acquisition. The more resolution is declined and the lesion is small, the more it causes a big error. So that it can influence the test result. Studied the optimum image reconstruction method by using variation of parameter, which can influence the PVE. Materials and Methods: It acquires the image in each size spheres which is injected ¹⁸F-FDG to hot site and background in the ratio 4:1 for 10 minutes by using NEMA 2001 IEC phantom in GE Discovey STE 16. The iterative reconstruction is used and gives variety to iteration 2-50 times, subset number 1-56. The analysis’s fixed region of interest in detail part of image and compute % difference and signal to noise ratio (SNR) using SUVmax. Results: It’s measured that SUVmax of 10 mm spheres, which is changed subset number to 2, 5, 8, 20, 56 in fixed iteration to times, SNR is indicated 0.19, 0.30, 0.40, 0.48, 0.45. As well as each sphere’s of total SNR is measured 2.73, 3.38, 3.64, 3.63, 3.38. Conclusion: In iteration 6th to 20th, it indicates similar value in % difference and SNR (3.47±0.09). Over 20th, it increases the phenomenon, which is placed low value on SUVmax through the influence of noise. In addition, the identical iteration, it indicates that SNR is high value in 8th to 20th in variation of subset number. Therefore, to reduce partial volume effect of small lesion, it can be declined the partial volume effect in iteration 6 times, subset number 8~20 times, considering reconstruction time.

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키워드

Partial volume effect (PVE) Iteration Subset number Standard uptake value (SUV) Signal to noise ratio (SNR) % Difference