PET/CT에서 재구성 프로그램의 성능 평가

• 영문명: Evaluation of Image Quality Based on Time of Flight in PET/CT
• 발행기관: 대한핵의학기술학회
• 저자명: 임정진(Jung Jin Lim) 윤석환(Seok Hwan Yoon) 김종필(Jong Pil Kim) 남궁식(Sik Nam Koong) 신성화(Seong Hwa Shin) 윤상혁(Sang Hyeok Yoon) 김영석(Yeong Seok Kim) 이형진(Hyeong Jin Lee) 이홍재(Hong Jae Lee) 김진의(Jin Eui Kim) 우재룡(Jae Ryong Woo)
• 간행물 정보: 『핵의학기술』Vol.16 No.2, 110~114쪽, 전체 5쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2012.10.30

영문 초록

Purpose : PET/CT is widely used for early checking up of cancer and following up of pre and post operation. Image reconstruction method is advanced with mechanical function. We want to evaluate image quality of each reconstruction program based on time of flight (TOF). Materials and Methods : After acquiring phantom images during 2 minutes with Gemini TF (Philips, USA), Biograph mCT (Siemens, USA) and Discovery 690 (GE, USA), we reconstructed image applied to Astonish TF (Philips, USA), ultraHD · PET (Siemens, USA), Sharp IR (GE, USA) and not applied. inside of Flangeless Esser PET phantom (Data Spectrum corp., USA) was filled with ¹⁸F-FDG 1.11 kBq/ml (30 μCi/ml) and 4 hot inserts (8. 12. 16. 25 mm) were filled with 8.88 kBq/ml (240 μCi/ml) the ratio of background activity and hot inserts activity was 1 : 8. Inside of triple line phantom (Data Spectrum corp., USA) was filled with ¹⁸F-FDG 37 MBq/ml (1 mCi). Three of lines were filled with 0.37 MBq (100 μCi). Contrast ratio and background variability were acquired from reconstruction image used Flangeless Esser PET phantom and resolution was acquired from reconstruction image used triple line phantom. Results : The contrast ratio of image which was not applied to Astonish TF was 8.69, 12.28, 19.31, 25.80% in phantom lid of which size was 8, 12, 16, 25 mm and it which was applied to Astonish TF was 6.24, 13.24, 19.55, 27.60%. It which was not applied to ultraHD · PET was 4.94, 12.68, 22.09, 30.14%, it which was applied to ultraHD · PET was 4.76, 13.23, 23.72, 31.65%. It which was not applied to SharpIR was 13.18, 17.44, 28.76, 34.67%, it which was applied to SharpIR was 13.15, 18.32, 30.33, 35.73%. The background variability of image which was not applied to Astonish TF was 5.51, 5.42, 7.13, 6.28%. it which was applied to Astonish TF was 7.81, 7.94, 6.40 6.28%. It which was not applied to ultraHD · PET was 6.46, 6.63, 5.33, 5.21%, it which was applied to ultraHD · PET was 6.08, 6.08, 4.45, 4.58%. It which was not applied to SharpIR was 5.93, 4.82, 4.45, 5.09%, it which was applied to SharpIR was 4.80, 3.92, 3.63, 4.50%. The resolution of phantom line of which location was upper, center, right, which was not applied to Astonish TF was 10.77, 11.54, 9.34 mm it which was applied to Astonish TF was 9.54, 8.90, 8.88 mm. It which was not applied to ultraHD · PET was 7.84, 6.95, 8.32 mm, it which was applied to ultraHD · PET was 7.51, 6.66, 8.27 mm. It which was not applied to SharpIR was 9.35, 8.69, 8.99, it which was applied to SharpIR was 9.88, 9.18, 9.00 mm. Conclusion : Image quality was advanced generally while reconstruction program which is based on time of flight was used. Futhermore difference of result compared each manufacture reconstruction program showed up, however this is caused by specification of instrument of each manufacture and difference of reconstruction algorithm. Therefore we need further examination to find out appropriate reconstruction condition while using reconstruction program used for advance of image quality.

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키워드

Time of Flight(TOF) Contrast ratio Background variability Resolution