PET/CT 검사에 있어서 MR Torso Coil의 CT 감쇄보정에 대한 영향 평가

• 영문명: The Effects of a MR Torso Coil on CT Attenuation Correction for PET
• 발행기관: 대한핵의학기술학회
• 저자명: 이승재(Seung Jae Lee) 반영각(Young Kag Bahn) 오신현(Shin Hyun Oh) 강천구 임한상(Han Sang Lim) 김재삼(Jae Sam Kim) 이창호(Chang Ho Lee) 서수현(Soo-Hyun Seo) 박용성(Yong Sung Park)
• 간행물 정보: 『핵의학기술』Vol.16 No.2, 81~86쪽, 전체 6쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2012.10.30

영문 초록

Purpose : Combined MR/PET scanners that use the MRI for PET AC face the challenge of absent surface coils in MR images and thus cannot directly account for attenuation in the coils. To make up for the weak point of MR attenuation correction, Three Modality System (PET/CT +MR) were used in Severance hospital. The goal of this work was to investigate the effects of MR Torso Coil on CT attenuation correction for PET. Materials and Methods : PET artifacts were evaluated when the MR Torso Coil was present of CTAC data with changing various kV and mA in uniformity water phantom and 1994 NEMA cylinderical phantom. They evaluated and compared the following two scenarios: (1) The uniform cylinder phantom and the MR Torso Coil scanned and reconstructed using CT-AC; (2) 1994 NEMA cylinderical phantom and the MR Torso Coil scanned and reconstructed using CT-AC. Results : Streak artifacts were present in CT images containing the MR Torso Coil due to metal components. These artifacts persisted after the CT images were converted for PET-AC. CT scans tended to over-estimate the linear attenuation coefficient when the kV and mA is increasing of the metal components when using conventional methods for converting from CT number. Conclusion : The presence of MR coils during PET/CT scanning can cause subtle artifacts and potentially important quantification errors. Alternative CT techniques that mitigate artifacts should be used to improve AC accuracy. When possible, removing segments of an MR coil prior to the PET/CT exam is recommended. Further, MR coils could be redesigned to reduce artifacts by rearranging placement of the most attenuating materials.

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키워드

Combined PET/CT/MRI attenuation correction CTAC with MR coil