Electronic Posters: Cardiovascular

Coronary Artery & Vessel Wall Imaging

Hall B Monday 14:00-16:00 Computer 35

14:00 3664. Retrospective Estimation of 3D Respiratory Motion Vectors in Coronary MRI

Alan Christopher O'Connor¹, Mehdi Hedjazi Moghari¹, Peng Hu¹, Dana C. Peters¹, Warren J. Manning¹, Reza Nezafat¹, Roger Ware Brockett<sup>2

1</sup>Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States; ²SEAS, Harvard University, Cambridge, MA, United States

Navigator correction methods were developed to increase the gating window size possible for free-breathing cardiac MRI and consequently reduce scan time. These methods typically rely on a generic scale-factor between measured diaphragm motion and heart motion. We present a novel scheme for estimating patient-, direction-, and coil-specific motion vectors directly from the scan data to correct for phase errors caused by respiratory motion of the heart.

14:30 3665. Quantitative Assessment of Right Coronary Artery MRI Using Quadrature RF Coils at 7 Tesla, Incorporating a Direct Comparison of Results to Those Acquired at 3 Tesla.

Saskia van Elderen¹, Maarten Versluis¹, Jos Westenberg¹, Harsh Agarwal², Nadine Smith¹, Matthias Stuber³, Albert de Roos¹, Andrew Webb<sup>1

1</sup>Radiology, Leiden University Medical Center, Leiden, Netherlands; ²Johns Hopkins University; ³Department of Radiology, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland

Using a quadrature RF coil with dimensions optimized for reliable navigator gating, this study with ten volunteers shows that 7T right coronary angiograms can be acquired with improved vessel sharpness compared to those obtained at 3T using identical imaging parameters.

15:00 3666. The Influence of Sublingual Nitroglycerin on Contrast -Enhanced Whole-Heart Coronary Magnetic Resonance Angiography at 3.0-T

Bin Sun¹, ZhiYong Chen², LiXin Jin³, Qing Duan

¹Radiology, FuJian Medical University Union Hospital, FuZhou, FuJian, China; ²Radiology, FuJian Medical University Union Hospital, China; ³Siemens Healthcare, MR Collaboration NE Asia, China

This article describes the influence of sublingual nitroglycerin spray on the lumen diameter, number of side branches visualized, average vessel length of 3.0-T contrast-enhanced whole-heart coronary magnetic resonance angiography. Twenty-four patients were prospectively included in this study: 12 were examined without sublingual nitroglycerin, and 12 were examined after the administration of sublingual nitroglycerin. Two blinded observers quantitatively assessed lumen diameter and length in the RCA, LAD and LCX. The number of acute marginal branches and septal branches was counted. The number of clinical side effects was evaluated. Sublingual nitroglycerin spray significantly dilates the coronary arteries and allows more side branches to be visualized at 3.0-T contrast-enhanced whole-heart CMRA without increasing resolution or increasing the number of side effects.

15:30 3667. 3T Coronary MRA Using 3D Multi-Interleaved Multi-Echo Acquisition and VARPRO Fat-Water Separation

Saurabh Shah¹, Xiaoming Bi¹, Diego Hernando², Peter Weale¹, Sven Zuehlsdorff¹, Sonia Nielles-Vallespin³, Peter Kellman<sup>4

1</sup>Siemens Healthcare, Chicago, IL, United States; ²University of Illinois at Urbana-Champaign, Urbana, IL, United States; ³Royal Brompton And Harefield NHS Foundation Trust, London, United Kingdom; ⁴National Institutes of Health / NHLBI, Bethesda, MD, United States

A 3D free-breathing navigator-gated multi-interleaved multi-echo GRE sequence is implemented with VARPRO fat-water separation and utilized in targeted acquisition of coronary arteries at 3T. This approach achieves reliable fat-suppression across field-of-view and provides clear depiction of coronaries for enhanced visualization.