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Abstract #0940

Prospective intraindividual comparison between highly accelerated breath hold non-contrast ECG-gated balanced steady state free precession MRA and ECG-gated CT angiography

Susan G Singh 1 , Gerard Smith 1 , Leighton Kearney 2 , Emma K Hornsey 1 , Michael Galea 1 , Mark Begbie 1 , Brenden McColl 1 , Jennifer Shoobridge 1 , Rinku Rayoo 2 , Jasmin Grewal 2 , Jian Xu 3 , Melanie Rayner 1 , George Matalanis 4 , and Ruth P Lim 1

1 Department of Radiology, Austin Health, Melbourne, Victoria, Australia, 2 Department of Cardiology, Austin Health, Melbourne, Victoria, Australia, 3 Siemens Medical Solutions, New York City, New York, United States, 4 Department of Cardiothoracics, Austin Health, Melbourne, Victoria, Australia

ECG-gated CTA is the clinical standard for non-invasive assessment of the thoracic aorta, but exposes patients to ionizing radiation and nephrotoxic contrast. An ECG-gated 3D breath hold non-enhanced balanced steady state free precession (bSSFP) MRA technique (NE MRA) has recently been described that offers a contrast and radiation-free alternative, particularly applicable to long-term surveillance of younger patients. We evaluate its performance in a clinical population, with eCTA as the reference standard. In our preliminary experience, NE MRA identifies aortic pathology with satisfactory diagnostic confidence and image quality, inferior to eCTA. Measured aortic dimensions in the proximal thoracic aorta are comparable.

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