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Im, Hyung-Jun,Bradshaw, Tyler,Solaiyappan, Meiyappan,Cho, Steve Y. The Korea Society of Nuclear Medicine 2018 핵의학 분자영상 Vol.52 No.1
Numerous methods to segment tumors using $^{18}F$-fluorodeoxyglucose positron emission tomography (FDG PET) have been introduced. Metabolic tumor volume (MTV) refers to the metabolically active volume of the tumor segmented using FDG PET, and has been shown to be useful in predicting patient outcome and in assessing treatment response. Also, tumor segmentation using FDG PET has useful applications in radiotherapy treatment planning. Despite extensive research on MTV showing promising results, MTV is not used in standard clinical practice yet, mainly because there is no consensus on the optimal method to segment tumors in FDG PET images. In this review, we discuss currently available methods to measure MTV using FDG PET, and assess the advantages and disadvantages of the methods.