Quiescent-Inflow Single-Shot (QISS) Magnetic Resonance Angiography Using a Highly Undersampled Radial K-Space Trajectory

Robert R. Edelman¹, Shivraman Giri², Eugene Dunkle³, Mauricio Galizia³, Parag Amin³, Ioannis Koktzoglou³

We hypothesized that high undersampling factors could be used in conjunction with radial Quiescent-Inflow Single-Shot (QISS) MRA in order to accelerate data collection and enable multi-slice and body coil acquisitions. Three healthy subjects and four patients with PAD were imaged on a 1.5T MRI system. Comparing Cartesian QISS (93 lines) with single slice radial QISS (92 views), the respective image quality scores were 2.6 0.4 and 2.9 0.2 (p = 0.04). We have demonstrated the feasibility of radial QISS MRA with much higher undersampling factors than are achievable using a Cartesian k-space trajectory and standard parallel imaging techniques.