Optimizing signal-to-noise ratio of high-resolution parallel single-shot diffusion-weighted echo-planar imaging at ultrahigh field strengths

Reischauer, Carolin; Vorburger, Robert S.; Wilm, Bertram J.; Järmann, Thomas; Boesiger, Peter

doi:10.1002/mrm.23057

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Optimizing signal-to-noise ratio of high-resolution parallel single-shot diffusion-weighted echo-planar imaging at ultrahigh field strengths
Authors:	Reischauer, Carolin Vorburger, Robert S. Wilm, Bertram J. Järmann, Thomas Boesiger, Peter
DOI:	10.1002/mrm.23057
Published in:	Magnetic Resonance in Medicine
Volume(Issue):	67
Issue:	3
Page(s):	679
Pages to:	690
Issue Date:	Jun-2012
Publisher / Ed. Institution:	Wiley
ISSN:	0740-3194 1522-2594
Language:	English
Subjects:	Adult; Brain mapping; Computer simulation; Diffusion Magnetic Resonance Imaging; Echo-Planar Imaging; Female; Humans; Image processing, computer-assisted; Male; Models, theoretical; Phantoms, imaging; Signal-to-noise ratio
Subject (DDC):	616: Internal medicine and diseases
Abstract:	The potential signal-to-noise ratio (SNR) gain at ultrahigh field strengths offers the promise of higher image resolution in single-shot diffusion-weighted echo-planar imaging the challenge being reduced T(2) and T(2) * relaxation times and increased B(0) inhomogeneity which lead to geometric distortions and image blurring. These can be addressed using parallel imaging (PI) methods for which a greater range of feasible reduction factors has been predicted at ultrahigh field strengths-the tradeoff being an associated SNR loss. Using comprehensive simulations, the SNR of high-resolution diffusion-weighted echo-planar imaging in combination with spin-echo and stimulated-echo acquisition is explored at 7 T and compared to 3 T. To this end, PI performance is simulated for coil arrays with a variable number of circular coil elements. Beyond that, simulations of the point spread function are performed to investigate the actual image resolution. When higher PI reduction factors are applied at 7 T to address increased image distortions, high-resolution imaging benefits SNR-wise only at relatively low PI reduction factors. On the contrary, it features generally higher image resolutions than at 3 T due to smaller point spread functions. The SNR simulations are confirmed by phantom experiments. Finally, high-resolution in vivo images of a healthy volunteer are presented which demonstrate the feasibility of higher PI reduction factors at 7 T in practice.
URI:	https://digitalcollection.zhaw.ch/handle/11475/5019
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Appears in collections:	Publikationen School of Engineering

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Reischauer, C., Vorburger, R. S., Wilm, B. J., Järmann, T., & Boesiger, P. (2012). Optimizing signal-to-noise ratio of high-resolution parallel single-shot diffusion-weighted echo-planar imaging at ultrahigh field strengths. Magnetic Resonance in Medicine, 67(3), 679–690. https://doi.org/10.1002/mrm.23057

Reischauer, C. et al. (2012) ‘Optimizing signal-to-noise ratio of high-resolution parallel single-shot diffusion-weighted echo-planar imaging at ultrahigh field strengths’, Magnetic Resonance in Medicine, 67(3), pp. 679–690. Available at: https://doi.org/10.1002/mrm.23057.

C. Reischauer, R. S. Vorburger, B. J. Wilm, T. Järmann, and P. Boesiger, “Optimizing signal-to-noise ratio of high-resolution parallel single-shot diffusion-weighted echo-planar imaging at ultrahigh field strengths,” Magnetic Resonance in Medicine, vol. 67, no. 3, pp. 679–690, Jun. 2012, doi: 10.1002/mrm.23057.

REISCHAUER, Carolin, Robert S. VORBURGER, Bertram J. WILM, Thomas JÄRMANN und Peter BOESIGER, 2012. Optimizing signal-to-noise ratio of high-resolution parallel single-shot diffusion-weighted echo-planar imaging at ultrahigh field strengths. Magnetic Resonance in Medicine. Juni 2012. Bd. 67, Nr. 3, S. 679–690. DOI 10.1002/mrm.23057

Reischauer, Carolin, Robert S. Vorburger, Bertram J. Wilm, Thomas Järmann, and Peter Boesiger. 2012. “Optimizing Signal-to-Noise Ratio of High-Resolution Parallel Single-Shot Diffusion-Weighted Echo-Planar Imaging at Ultrahigh Field Strengths.” Magnetic Resonance in Medicine 67 (3): 679–90. https://doi.org/10.1002/mrm.23057.

Reischauer, Carolin, et al. “Optimizing Signal-to-Noise Ratio of High-Resolution Parallel Single-Shot Diffusion-Weighted Echo-Planar Imaging at Ultrahigh Field Strengths.” Magnetic Resonance in Medicine, vol. 67, no. 3, June 2012, pp. 679–90, https://doi.org/10.1002/mrm.23057.