Electronic Posters: Cardiovascular

Wednesday 13:30-15:30 Computer 35

13:30 3672. Local Inversion Spiral Coronary Vessel Wall Imaging: A Comparison Between 1.5T and 3T

Sarah Anne Peel¹, Tarique Hussain¹, Gerald Greil¹, Tobias Schaeffter¹, René M. Botnar<sup>1

1</sup>Division of Imaging Sciences, King's College London, London, United Kingdom

In this study we sought to compare the 3D spiral coronary vessel wall imaging using the local inversion pre-pulse technique on 1.5T and 3T systems. Imaging at 1.5T resulted in consistent image quality and good blood suppression. While SNR was improved at 3T, image quality was more consistent and artifact level lower at 1.5T. Although excellent coronary vessel wall images can be acquired at 3T, improvements in shimming and f0 determination are required to improve overall robustness compared to 1.5T.

14:00 3673. The Use of Biofeedback with MCLAWS to Guide Respiration and Provide Inspiratory and Expiratory Images from a Single Navigator-Gated 3D Coronary MRA Acquisition.

Permi Jhooti¹, Jennifer Keegan², Klaus Scheffler¹, David Firmin<sup>2

1</sup>Radiological Physics, University of Basel, Basel, Switzerland; ²CMR Unit, Royal Brompton Hospital, United Kingdom

The mCLAWS technique produces whole heart images in the fastest possible time for a given respiratory pattern and gating window, as well as image datasets at end expiration and end inspiration. The end inspiratory images are generally poorer quality than the end expiratory images because the end inspiratory position is usually more variable and the end inspiratory pause shorter. We have implemented a respiratory biofeedback ‘game’ with a multi-navigator mCLAWS technique to regularise the subjects’ breathing patterns and to enable the acquisition of high quality end inspiratory and end expiratory images from a single whole heart acquisition.

14:30 3674. High Resolution 3D Spiral Coronary Vessel Wall Imaging with >99% Respiratory Efficiency Using Beat to Beat Respiratory Motion Correction: Quantitative Comparison with Navigator Gated 2D Spiral and Turbo Spin Echo Imaging

Andrew David Scott^1,2, Jennifer Keegan, ^1,2, David N. Firmin, <sup>1,2

1</sup>National Heart and Lung Institute, Imperial College, London, Greater London, United Kingdom; ²Cardiovascular Magnetic Resonance Unit, The Royal Brompton Hospital, London, Greater London, United Kingdom

High resolution 3D coronary artery wall imaging potentially enables the assessment of the full 3D extent of a plaque, but is time consuming when used with navigator gating. We compare 3D spiral right coronary artery wall imaging with a highly efficient beat-to-beat respiratory-motion-correction technique using localized tracking of the fat around the artery (99.6% respiratory efficiency) with navigator gated (39% efficient) 2D spiral and 2D turbo spin echo techniques. The techniques were compared quantitatively using vessel wall thickness. The improved respiratory efficiency of the beat-to-beat respiratory-motion-correction technique facilitates high resolution 3D coronary wall imaging within a reasonable duration.

15:00 3675. MR Imaging of Myocardial Scar and Coronary Vein Anatomy in Patients Awaiting Cardiac Resynchronization Therapy Using a High-Relaxivity Contrast Agent.

Simon Graham Duckett¹, Matthew Ginks¹, Benjamin R. Knowles¹, Amedeo Chiribiri¹, Stephen Sinclair¹, Gerry Carr-White², Aldo Rinaldi², Rene Botnar¹, Eike Nagel¹, Reza Razavi¹, Tobias Schaeffter<sup>1

1</sup>Kings College London, London, United Kingdom; ²Guy's and St Thomas's Hospital

As Cardiac resynchronization therapy is becoming more widely available for the treatment of patients with heart failure, there has been increased interest in imaging the coronary sinus and its tributaries. Previous studies using CMR have mainly focused on using intravascular contrast agents (CA), which give no useful information about myocardial scar, and require a separate MR-exam to assess scar and viability. Most of these studies patients with normal left ventricular function have been recruited. We present a single CMR examination imaging the coronary venous anatomy and myocardial scar in patients with HF using a high-relaxivity contrast agent.