Visualizing parametric maps as overlays

Visualizing parametric maps as overlay is achieved by simply drag & dropping the desired parametric map into one of the MPR windows. The overlay appearance can then be modified via the menu options under the  <Overlay> tab. Here you can change the overlay transparency, toggle visualization of overlay on/off and change window/level as well as color palette used.

Figure 1: Visualization of functional output map (VAI vessel calibre map) as overlay and corresponding overlay settings menu.

Sometimes, the generated parametric maps may contain outlier values which could result in a ‘flat’ map due to some extreme values. This effect can be reduced by checking ‘remove outliers’ under the <Perfusion Analysis> tab prior to perfusion analysis. Further, the color palette can be improved by excluding extreme values in the resulting overlay map. By default, the 1% highest pixel values are eliminated when pressing the ‘update’ button under the <Overlay> tab, if selected.