PET/CT 검사에서 횡격막에 의한 인공물의 CTAC Shift 보정방법의 유용성

• 영문명: Usefulness of CTAC Shift Revision Method of Artifact by Diaphragm in PET/CT
• 발행기관: 대한핵의학기술학회
• 저자명: 함준철(Jun Cheol Ham) 강천구(Chun Koo Kang) 조석원(Seok Won Cho) 반영각(Young Kag Bahn) 이승재(Seung Jae Lee) 임한상(Han Sang Lim) 김재삼(Jae Sam Kim) 이창호(Chang Ho Lee)
• 간행물 정보: 『핵의학기술』Vol.17 No.1, 71~75쪽, 전체 5쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2013.04.30

영문 초록

Purpose: Currently, decrement revision using LDCT is used in PET/CT. But cold artifacts are often found in decrement revision image by mismatch between LDCT image and Emission image near diaphragm due to patient’s respiration. This research studied reduction of cold artifact by patient’s respiration using CTAC Shift among revision methods. Materials and Methods: From March to September in 2012, 30 patients who had cold artifacts by respiration were targeted using PET/CT Discovery 600 (GE Healthcare, MI, USA) equipment. Patients with cold artifacts were additionally scan in diaphragm area, and the image shown cold artifacts at whole body test were revised using CTAC Shift. Cold artifacts including image, additional scan image and CTAC Shift revision image were evaluated as 1~5 points with naked eye by one nuclear medicine expert, 4 radiotechnologists with over 5 year experience. Also, standard uptake value of 3 images was compared using paired t-test. Results: Additional scan image and CTAC Shift revision image received relatively higher score in naked eye evaluation than cold artifacts including image. The additional scan image and CTAC Shift revision image had high correlation as the results of ANOVA test of standard uptake value and did not show significant difference. Conclusion: When cold artifacts are appeared by patient’s respiration at PET/CT, it causes not only patient inconvenience but troubles in test schedule due to extra radiation exposure and time consumption by additional scan. But if CTAC Shift revision image can be acquired with out additional scan, it is considered to be helped in exact diagnosis without unnecessary extra radiation exposure and additional scan.

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실험 재료 및 방법

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키워드

PET/CT CTAC Shift Respiration Cold Artifact