Published in:
Open Access
01-12-2016 | Poster presentation
Prospective Heart Tracking for Respiratory Motion Compensation in Whole-heart Magnetic Resonance Angiography
Authors:
Mehdi Hedjazi Moghari, Tal Geva, Andrew J Powell
Published in:
Journal of Cardiovascular Magnetic Resonance
|
Special Issue 1/2016
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Excerpt
Electrocardiogram and respiratory navigator (NAV)-gated 3D whole-heart magnetic resonance angiography (MRA) acquired with an intravascular gadolinium-based contrast agent and a non-selective inversion recovery (IR) pulse to null the myocardial signal generates a high-resolution anatomic dataset allowing for a comprehensive evaluation of intra-cardiac, coronary, and vascular abnormalities [
1]. In this technique, an additional IR pulse is also included to selectively restore the signal in the liver, and thus allow NAV tracking of the diaphragm (liver-lung interface). This selective IR pulse, however, excites the blood flowing from veins into the heart creating a bright inflow artifact that hinders image interpretation [
2]. Therefore, we sought to develop a prospective respiratory-gating technique (Heart-NAV) that tracks the heart rather than the diaphragm position and eliminates the inflow artifact without compromising image quality. …