Exposure Conditions in Measurement of Visceral Adipose Tissue by CT / 日本農村医学会雑誌

ABSTRACT

[Purposes] In 2005, criteria for diagnosing the metabolic syndrome was officially announced. Accumulation of fat tissue in and around the abdomen is one of the metabolic syndrome. To assess the excess fat tissue, the waist circumference is measured. Computed tomography can work out the area of the intra-abdominal fat tissue. In this study, we examined exposure conditions with a view to reducing dose and radiation risk.[Methods] A CT phantom model simulating the abdominal area at the level of the umbilicus was made for obtaining the pictures of the intra-abdominal fat tissue with the tube current ranging from 10 mA to 250 mA set at intervals of 10 mA. The average CT value for the area of mimic fat tissue obtained by each scan and standard deviations were worked out.[Results] The size of fat tissue and the mean CT value were constant with a tube current of 100 mA or over. [Conclusions] It was found possible to measure the area of intra-abdominal fat tissue with a tube current of 100 mA. Therefore, our findings showed that the radiation exposure could be reduced by 60% when compared with the 250 mA CT used at a clinical setting.