Methods to evaluate myocardial blood flow (MBF) include single photon emission tomography, positron emission tomography (PET), magnetic resonance imaging, and computed tomography (CT). Of these, ¹⁵O-water PET is the most ideal quantitative method and is considered the golden standard for MBF. In contrast, myocardial CT perfusion with 320 row CT has the advantage of simultaneous morphological and functional evaluation. The MBF can be calculated using the maximum upslope method (MU), the deconvolution method (dec), or the single compartment method, however, the problem is that different calculation methods produce different values of MBF. The MBFs calculated using the MU and dec methods tend to be underestimated, especially in the high flow region.¹ On the other hand, the single compartment method corrected by the Renkin-Crone equation has already been validated in ¹⁵O-water PET.² The purpose of this study is to determine whether MBF calculated by the MU and dec methods (MBF_MU and MBF_dec) can be corrected using the Renkin-Crone equation.