PET/CT 검사에서 Q.Clear 기법의 유용성에 대한 고찰

• 영문명: The Usefulness of Q.Clear Technique in PET / CT
• 발행기관: 대한핵의학기술학회
• 저자명: 최용훈(Yong Hoon Choi) 김정열(Jung Yul Kim) 최영숙(Young Sook Choi) 임한상(Han Sang Lim) 김재삼(Jae Sam Kim)
• 간행물 정보: 『핵의학기술』Vol.21 No.2, 31~36쪽, 전체 6쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2017.11.30

영문 초록

Purpose Recently, the performance of PET/CT scanner has been improved and various techniques have been developed to increase the image quality such as Sensitivity and Resolution. The purpose of this study is to evaluate the usefulness of Q.Clear (a fully convergent iterative reconstruction) technique of GE Discovery IQ equipment to enhance the image quality. Materials and Methods All scans were acquired by Discovery IQ (GE Healthcare, MI, USA). In NEMA IEC Body Phantom test, Background to Hot-sphere (10 ㎜, 13 ㎜, 17 ㎜, 22 ㎜) ratio was 1:4 and scan time was 3 minutes. The images were reconstructed by VPHDs (VUE Point High-Definition + SharpIR) and Q.Clear to evaluate each Contrast. We injected 18F-FDG 187 M㏃ to PET/SPECT Performance Phantom. And then it was scanned for 4 minutes to evaluate Resolution and Uniformity. T-test statistical analysis was performed on SUVmax of small lesions less than 2 ㎝ in 100 clinical patients regardless of disease type. Results In the NEMA IEC Body Phantom, the Contrast was 63.6 ± 5.7% (VPHDs) and 75 ± 4.8% (Q.Clear). In the PET/SPECT Performance Phantom, the Resolution was 9.2 ㎜ (VPHDs) and 7.3 ㎜ (Q.Clear). Uniformity of Q.Clear was 10.8% better than VPHDs. T-test statistic of the clinical patients showed a significant difference of p value of 0.021. Conclusion Both the phantom test and the clinical results showed that the quality of the image was improved in Q.Clear was applied. The SUVmax was highly measured in Q.Clear and the lesions were clearly distinguished visually. Therefore Q.Clear can be useful in various aspects such as dose-reduction, patients evaluation and image analysis.

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키워드

Q.Clear VPHDs SUVmax