AUTO-SMASH: A self-calibrating technique for SMASH imaging |
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Authors: | Peter M Jakob Mark A Grisowld Robert R Edelman Daniel K Sodickson |
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Affiliation: | (1) Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Ave, 02215 Boston, MA, USA;(2) Department of Medicine, Cardiovascular Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA |
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Abstract: | Recently a new fast magnetic resonance imaging strategy, SMASH, has been described, which is based on partially parallel imaging
with radiofrequency coil arrays. In this paper, an internal sensitivity calibration technique for the SMASH imaging method
using self-calibration signals is described. Coil sensitivity information required for SMASH imaging is obtained during the
actual scan using correlations between undersampled SMASH signal data and additionally sampled calibration signals with appropriate
offsets ink-space. The advantages of this sensitivity reference method are that no extra coil array sensitivity maps have to be acquired
and that it provides coil sensitivity information in areas of highly non-uniform spin-density. This auto-calibrating approach
can be easily implemented with only a small sacrifice of the overall time savings afforded by SMASH imaging. The results obtained
from phantom imaging experiments and from cardiac studies in nine volunteers indicate that the self-calibrating approach is
an effective method to increase the potential and the flexibility of rapid imaging with SMASH. |
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Keywords: | SMASH Simultaneous acquisition RF coil array MR image reconstruction |
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