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Abstract #2521

Nonenhanced Evaluation of the Peripheral Arteries using Quiescent-Inflow Single-Shot with Arterial Spin Labeling (QISS ASL) MR Angiography

Robert R. Edelman 1,2 , Oisin Flanagan 2 , Shivraman Giri 3 , and Ioannis Koktzoglou 1,4

1 Radiology, NorthShore University HealthSystem, Evanston, IL, United States, 2 Radiology, Northwestern University, Feinberg School of Medicine, Chicago, IL, United States, 3 Siemens Healthcare, Chicago, IL, United States, 4 Radiology, University of Chicago Pritzker School of Medicine, Chicago, IL, United States

Quiescent-Inflow single-shot (QISS) MRA is accurate for evaluation of the peripheral arteries. However, the requirement for fat suppression imposes restrictions on pulse sequence design, e.g. necessitating the use of partial Fourier, which degrades spatial resolution and reduces signal-to-noise ratio. We propose the use of an arterial spin labeled version of QISS MRA to overcome these limitations. The technique involves subtraction of two QISS data sets, one with slice-selective saturation and the other with nonselective saturation. QISS ASL improves background suppression compared with standard QISS, enabling visualization of smaller branch vessels than would otherwise be possible. Venous suppression is also improved.

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