Fig. 4From: Dual-energy CT for the detection of skull base invasion in nasopharyngeal carcinoma: comparison of simulated single-energy CT and MRIFalse-negative findings for skull base invasions by MRI in a 43-year-old man with NPC. A The axial MRI images (fat-suppressed T1-weighted image after gadolinium administration) do not show obvious abnormal contrast enhancement at the left pterygoid process (red arrow). The DECT images (B, IO image; C, Zeff image) directly show marked bone invasions with higher iodine concentrations than right pterygoid process (green arrow). D The SECT images (bone window) confirm the invasions with sclerosis at the left pterygoid process like the DECT imagesBack to article page