Texture analysis on parametric maps derived from dynamic contrast-enhanced magnetic resonance imaging in head and neck cancer

Figure 1 Pretreatment and intra-treatment dynamic contrast-enhanced magnetic resonance imaging images of patient with locoregional failure (male, 50 years). The top row shows images of the Pre study, and the bottom row shows images from the Intra study. From left to right, the columns show a T1-weighted image, K^trans (min^-1) map, and v_e map. The white rectangles delineate the ROIs at the metastatic nodes. K^trans and v_e maps are zoomed at the locations of ROIs. The corresponding texture measures for the K^trans and Ve maps for pre and intra are: K^trans:E (Pre: 0.25, Intra: 0.38), H (Pre: 0.81, Intra: 0.83), v_e: E (Pre: 0.27, Intra: 0.70), H (Pre: 0.83, Intra: 0.90). Pre: Pretreatment; Intra: Intra-treatment; E: Energy; H: Homogeneity; ROIs: Regions of interest.