Abstract #3999

Navigator acceptance window width does not affect accuracy and precision in free-breathing 2D cardiac MR fingerprinting of the myocardium at 3T.

Pauline Calarnou¹, Augustin C. Ogier¹, Roger Hullin², Philippe Meyer³, Jérôme Yerly^1,4, and Ruud B. Van Heeswijk¹

¹Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland, ²Cardiology Service, Cardiovascular Department, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland, Lausanne, Switzerland, ³Cardiology Service, Department of Medicine, Geneva University Hospital and University of Geneva, Switzerland, Geneva, Switzerland, ⁴CIBM, Lausanne, Switzerland

Synopsis

Keywords: Myocardium, Relaxometry

We implemented and characterized a free-breathing 2D cardiac joint T₁-T₂ MR fingerprinting technique at 3T named PARMA that includes a lung-liver navigator to minimize through-plane motion. We assessed the effect of rejected navigators on the relaxation times. Joint T₁-T₂ maps with four different navigator acceptance window widths (NAWWs from ±4mm to ±32mm) were acquired in 6 healthy volunteers and compared to clinical routine techniques. The accuracy and precision of the maps resulting from the different NAWWs did not significantly differ, suggesting that the NAWW can be chosen as a balance between navigator inefficiency and through-plane motion.

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