Abstract #1813

First Application of a 3D Radial Trajectory for Free-Breathing ECG-Triggered Cardiac T1ρ Mapping at 1.5 T

Jana Huiyue Zhang¹, Aurélien Bustin^2,3, Augustin C. Ogier¹, Ruud B. van Heeswijk¹, Christopher W. Roy¹, Isabel Montón Quesada¹, Matthias Stuber^1,4, and Jérôme Yerly^1,4

¹Department of Diagnostic and Interventional Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland, ²IHU LIRYC, Electrophysiology and Heart Modeling Institute, INSERM U1045, Centre de recherche Cardio-Thoracique de Bordeaux, Université de Bordeaux, Bordeaux, France, ³Department of Cardiovascular Imaging, Hôpital Cardiologique du Haut-Lévêque, CHU de Bordeaux, Bordeaux, France, ⁴Center for Biomedical Imaging (CIBM), Lausanne, Switzerland

Synopsis

Keywords: Myocardium, Cardiovascular

Motivation: Most cardiac T1ρ mapping techniques collect data in 2D, while the few existing 3D methods use a Cartesian sampling trajectory.

Goal(s): In this study, we report the first use of a 3D radial trajectory for whole-heart T1ρ mapping at 1.5 T.

Approach: The proposed technique was validated in a phantom, tested in one volunteer, and compared to a 2D reference method.

Results: Our results show that the T1ρ values obtained from our 3D technique are comparable to the 2D reference values for both phantom and volunteer. However, we observed an underestimation of the T1ρ values using the 3D method in the phantom.

Impact: 3D radial free-breathing electrocardiogram-triggered cardiac T1ρ mapping at 1.5 T has the potential to serve as a contrast agent-free adjunct to late gadolinium enhancement imaging for the whole-heart motion-robust quantification of tissue properties such as myocardial fibrosis.

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