Fig. 4

Representative cases with myocardium homogeneity among different image reconstruction methods. The myocardium computed tomography (CT) attenuation resulted in significantly different for filtered-back projection (FBP; P < 0.001) and hybrid iterative reconstruction (IR; P < 0.001), while there were no significant differences for deep learning image reconstruction (DLR; P = 0.153) and super-resolution (SR) DLR (P = 0.345). A–D The color-coded map with left ventricle short-axis images at the midventricular level demonstrated markedly higher myocardium CT attenuation in the inferolateral and anterior segments (arrows) for FBP and hybrid IR while myocardium CT attenuation was homogeneous for DLR and SR-DLR. E–H Histogram showed wider distribution in attenuation values for FBP and hybrid IR with higher standard deviations (STDs). Conversely, DLR and SR-DLR resulted in narrow histogram distribution in attenuation values with lower STD