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Abstract #1398

Navigator-Gated Quiescent Interval Single Shot for Pelvic MR Angiography

Christopher Glielmi1, Xiaoming Bi1, Ioannis Koktzoglou2, Philip Hodnett3, Sven Zuehlsdorff1, Robert R. Edelman2

1Cardivascular MR R&D, Siemens Healthcare, Chicago, IL, United States; 2Radiology, NorthShore University HealthSystem, Evanston, IL, United States; 3Radiology, Northwestern University, Chicago, IL, United States

Quiescent Interval Single Shot (QISS) is a promising new method for non-contrast magnetic resonance angiography (MRA) with high diagnostic potential. However, respiratory motion can cause stair-step artifacts in some regions including the iliac arteries. In this study, we present navigator-gated QISS which gates the data acquisition based on diaphragm position to minimize respiratory artifacts. Our approach provides image quality consistently comparable to breath-holding with absence of respiratory artifacts seen in standard free breathing approaches. We recommend navigator-gated QISS as a free breathing alternative to breath-holding, further improving the diagnostic quality of QISS.