Fig. 5

A 59-year-old male with T1 rectal adenocarcinoma who underwent dual-layer spectral CT and HR-MRI. VMI 40–60 keV in the arterial phase (a–c) and venous phase (d,e) demonstrate that the tumor is confined to the submucosa. The VMI 40 keV of venous phase (d) provides the best tumor conspicuity and margin delineation and exhibits no significant difference compared to MRI (g: axial T2WI; h: Gd-DPTA enhanced T1WI; i: DWI at b = 1000 s/mmm²)