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http://dx.doi.org/10.3348/kjr.2015.16.4.919

Detection of Myocardial Metabolic Abnormalities by 18F-FDG PET/CT and Corresponding Pathological Changes in Beagles with Local Heart Irradiation  

Yan, Rui (Nursing College of Shanxi Medical University)
Song, Jianbo (Department of Nuclear Medicine, First Hospital of Shanxi Medical University)
Wu, Zhifang (Department of Nuclear Medicine, First Hospital of Shanxi Medical University)
Guo, Min (Department of Cardiology, First Hospital of Shanxi Medical University)
Liu, Jianzhong (Department of Nuclear Medicine, First Hospital of Shanxi Medical University)
Li, Jianguo (Department of Radiological and Environmental Medicine, China Institute for Radiation Protection)
Hao, Xinzhong (Department of Nuclear Medicine, First Hospital of Shanxi Medical University)
Li, Sijin (Department of Nuclear Medicine, First Hospital of Shanxi Medical University)
Publication Information
Korean Journal of Radiology / v.16, no.4, 2015 , pp. 919-928 More about this Journal
Abstract
Objective: To determine the efficacy of 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) in the detection of radiation-induced myocardial damage in beagles by comparing two pre-scan preparation protocols as well as to determine the correlation between abnormal myocardial FDG uptake and pathological findings. Materials and Methods: The anterior myocardium of 12 beagles received radiotherapy locally with a single X-ray dose of 20 Gy. 18F-FDG cardiac PET/CT was performed at baseline and 3 months after radiation. Twelve beagles underwent two protocols before PET/CT: 12 hours of fasting (12H-F), 12H-F followed by a high-fat diet (F-HFD). Regions of interest were drawn on the irradiation and the non-irradiation fields to obtain their maximal standardized uptake values (SUVmax). Then the ratio of the SUV of the irradiation to the non-irradiation fields (INR) was computed. Histopathological changes were identified by light and electron microscopy. Results: Using the 12H-F protocol, the average INRs were $1.18{\pm}0.10$ and $1.41{\pm}0.18$ before and after irradiation, respectively (p = 0.021). Using the F-HFD protocol, the average INRs were $0.99{\pm}0.15$ and $2.54{\pm}0.43$, respectively (p < 0.001). High FDG uptake in irradiation field was detected in 33.3% (4/12) of 12H-F protocol and 83.3% (10/12) of F-HFD protocol in visual analysis, respectively (p = 0.031). The pathology of the irradiated myocardium showed obvious perivascular fibrosis and changes in mitochondrial vacuoles. Conclusion: High FDG uptake in an irradiated field may be related with radiation-induced myocardial damage resulting from microvascular damage and mitochondrial injury. An F-HFD preparation protocol used before obtaining PET/CT can improve the sensitivity of the detection of cardiotoxicity associated with radiotherapy.
Keywords
18F-FDG PET/CT; Radiation-induced heart disease; Radiotherapy; Pathology;
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