Figure 2.

Elimination of dark rim artifact on first-pass perfusion imaging using radial k-space trajectory. The left hand panel shows examples of first pass perfusion images in two subjects. The artifact seen in the phase encode (PE) direction with Cartesian trajectory (top row) is eliminated with radial k-space filling (bottom row). The histograms reveal a significant reduction in artifact scores (on a scale of 1–4) and maximum width of dark rim artifacts (DRA) with the radial technique (Sharif et al., abstract O3).