Semi-quantitative positron emission tomography (PET) values, such as the maximum standardized uptake value (SUVA breast phantom containing the left myocardium, which was prepared using a 3D printer, filled withThe phantom study showed that the higher the RCR of the myocardium and the closer it is to the top edge of the phantom, the higher is the pixel value of the dbPET images. In a clinical study, LUR was significantly correlated with myocardial SUVFDG uptake in the myocardium affected dbPET images of the left breast, especially near the chest wall. Further, the effect of RI outside the FOV, such as in the myocardium, must be considered in the quantitative evaluation of breast cancer using dbPET.