Volume 10 Supplement 1
2117 High-resolution 3D free-breathing coronary MR angiography using wideband SSFP at 3 Tesla
© Lee et al; licensee BioMed Central Ltd. 2008
Published: 22 October 2008
Steady-state free precession (SSFP) imaging at 3 T can be used to generate coronary artery images with substantially higher signal to noise ratio (SNR) and blood-myocardium contrast to noise ratio (CNR) compared to 1.5 T, but is limited by potentially severe off-resonance artifacts . The need for a short TR (to avoid banding) limits the spatial resolution to > 1 mm using conventional gradients, making it difficult to achieve the sub-millimeter resolution needed for accurately evaluating coronary artery stenoses.
Wideband SSFP uses two alternating repetition times to increase the band spacing in the steady-state frequency response, with a modest sacrifice in SNR . It can suppress off-resonance related artifacts in cardiac imaging for a given spatial resolution. We demonstrate the application of wideband SSFP to 3D free-breathing coronary artery imaging at 3 T, and compare results with conventional SSFP at 3 T.
Results and discussion
We have demonstrated wideband SSFP in free-breathing 3D coronary artery MR imaging at 3 T. A spatial resolution of 0.68 × 1.0 × 1.0 mm3 was achieved without the banding artifacts experienced by conventional SSFP with excellent coronary artery imaging.
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This article is published under license to BioMed Central Ltd.