PET/CT 검사 시 호흡에 따른 영상 왜곡 감소를 위한 엎드린 자세의 유용성 평가

• 영문명: Evaluation of the usefulness of prone position for reducing the image distortion due to respiration in PET/CT
• 발행기관: 대한핵의학기술학회
• 저자명: 이한울(Han Wool Lee) 김정열(Jung Yul Kim) 최용훈(Yong Hoon Choi) 임한상(Han Sang Lim) 김재삼(Jae Sam Kim)
• 간행물 정보: 『핵의학기술』Vol.23 No.1, 59~63쪽, 전체 5쪽
• 주제분류: 의약학 > 방사선과학
• 파일형태: PDF
• 발행일자: 2019.04.30

영문 초록

Purpose The motion due to respiration of patients undergoing PET/CT is a cause of artifacts in image and registration error between PET and CT images. The degree of displacement and distortion for tumor, which affects the measurement of Standard Uptake Value (SUV) and lesion volume, is especially higher for tumors that is small or located at the base of lungs. The purpose of this study was to evaluate the usefulness of prone position in the correction of image distortion due to respiration of patients in PET/CT. Materials and Methods The imaging equipment used in this study was PET/CT Discovery 600 (GE Healthcare, MI, USA). 20 patients whose lesions were identified in the middle and lower lungs from May to August 2018 were enrolled in this study. After acquiring whole body image in the supine position, additional images of the lesion area were obtained in the prone position with the same conditions. SUVmax, SUVmean, and volume of the lesion were measured for each image, and the displacement of the lesion on PET and CT images were measured, compared, and analyzed. Results The SUVmax, SUVmean, and volume, and displacement of the lesion were 4.72±2.04, 3.10±1.38, 4.68±3.20, and 4.64±1.88, respectively for image acquired in the supine position and 5.89±2.42, 3.97±1.65, 2.13±1.09, and 2.24±0.84, respectively for image acquired in the prone position, indicating that, for all the lesions imaged, SUVmax and SUVmean were higher and volume and displacement were smaller in the images acquired in prone position compared to those acquired in supine one(p<0.05). Conclusion These results showed that the prone position PET/CT imaging improves the quality of the image by increasing the SUV of the lesion and reducing the respiratory artifacts caused by registration error between PET and CT images. It is considered that the PET/CT imaging in the prone position is helpful in the diagnosis of the disease as an economical and efficient methods that correct registration error for the lesions in basal lung and reduce artifacts.

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키워드

PET/CT Respiration Prone Position