This sample show cases how to load vector images as ribbon icons in WPF Ribbon control for better icon quality.
The VectorImage and IconType properties are exposed by all button controls (RibbonButton, DropDownButton and SplitButton). You need to set IconType property as VectorImage and set the path data to VectorImage property to load vector image as icon for buttons in WPF Ribbon control.
KB article - How to load vector image as ribbon icon in WPF Ribbon control?