핵의학 융합영상의 표준섭취계수 차이에 관한 연구

Study on the Difference of Standardized Uptake Value in Fusion Image of Nuclear Medicine

PET-CT and PET-MRI which integrates CT using ionized radiation and MRI using phenomena of magnetic resonance are determined to have the limitation to apply the semi-quantitative index, standardized uptake value (SUV), with the same level due to the fundamental differences of image capturing principle and reorganization, hence, their correlations were analyzed to provide their clinical information. To 30 study subjects maintaining pre-treatment, 18F-FDG (5.18 MBq/㎏) was injected and they were scanned continuously without delaying time using Biograph TM mMR 3T (Siemens, Munich) and Biograph mCT 64 (Siemens, Germany), which is an integral type, under the optimized condition except the structural differences of both scanners. Upon the measurement results of SUV max setting volume region of interest with evenly distributed radioactive pharmaceuticals by captured images, SUV max mean values of PET-CT and PET-MRI were 2.94±0.55 and 2.45±0.52, respectively, and the value of PET-MRI was measured lower by &#8211;20.85±7.26% than that of PET-CT. Also, there was a statistically significant difference in SUVs between two scanners (P<0.001), hence, SUV of PET-CT and PET-MRI cannot express the clinical meanings in the same level. Therefore, in case of the patients who undergo cross follow-up tests with PET-CT and PET-MRI, diagnostic information should be analyzed considering the conditions of SUV differences in both scanners.