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Abstract #3626

GRAPPA-accelerated coronary MRA benefits from an outer volume suppressing 2D-T 2 -Prep

Andrew J Coristine 1,2 , Jrme Yerly 1,2 , and Matthias Stuber 1,2

1 Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, VD, Switzerland, 2 CardioVascular Magnetic Resonance (CVMR) research centre, Centre for Biomedical Imaging (CIBM), Lausanne, VD, Switzerland

Two dimensional (2D) spatially selective radiofrequency (RF) pulses may be used to constrain the location from which an MR signal is obtained. T 2 -Preparation, or T 2 -Prep, is a magnetization preparation scheme used to improve blood/myocardium contrast. By incorporating a "pencil beam" 2D pulse into a T 2 -Prep module, one may create a "2D-T2-Prep" that combines T2-weighting with the intrinsic spatial selectivity of a 2D pulse. This may be of particular benefit to parallel imaging techniques such as GRAPPA, where artefacts can originate from residual foldover signal. As the 2D-T 2 -Prep suppresses signal from outside the area of interest, parallel imaging artefacts may likewise be reduced. In this abstract, we present numerical simulations, phantom validation, and in vivo MRA of the right coronary artery, demonstrating that GRAPPA accelerated images may be dramatically improved through the use of a 2D-T 2 -Prep.

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