Diagnostic efficacy of diffusion-weighted imaging and semiquantitative and quantitative dynamic contrast-enhanced magnetic resonance imaging in salivary gland tumors

Figure 5 A 79-year-old male patient with squamous cell cancer in the left parotid gland. A: On axial plane T1-weighted image, an irregularly contoured, hypointense mass involving skin and subcutaneous tissues is observed; B: On axial contrast-enhanced T1-weighted image, the mass shows an intense heterogeneous contrast enhancement; C: ADC value on the apparent diffusion coefficient map was 1.1 × 10^-3 mm²/s; D: The mass is heterogeneously hyperperfused on color coded perfusion image; E: Type C time intensity curve shows a 10% washout ratio; F, G, and H: K_trans, K_ep, and V_e values on quantitative perfusion images were 0.993 min^-1, 1.659 min^-1, and 0.612, respectively. ADC: Apparent diffusion coefficient.