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J Magn Reson. 2014 Mar;240:102-12. doi: 10.1016/j.jmr.2013.11.002. Epub 2013 Nov 15.

Highly accelerated acquisition and homogeneous image reconstruction with rotating RF coil array at 7T-A phantom based study.

Author information

1
School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
2
State Key Laboratory of Brain and Cognitive Science, Beijing MRI Centre for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.
3
School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia. Electronic address: stuart@itee.uq.edu.au.

Abstract

Parallel imaging (PI) is widely used for imaging acceleration by means of coil spatial sensitivities associated with phased array coils (PACs). By employing a time-division multiplexing technique, a single-channel rotating radiofrequency coil (RRFC) provides an alternative method to reduce scan time. Strategically combining these two concepts could provide enhanced acceleration and efficiency. In this work, the imaging acceleration ability and homogeneous image reconstruction strategy of 4-element rotating radiofrequency coil array (RRFCA) was numerically investigated and experimental validated at 7T with a homogeneous phantom. Each coil of RRFCA was capable of acquiring a large number of sensitivity profiles, leading to a better acceleration performance illustrated by the improved geometry-maps that have lower maximum values and more uniform distributions compared to 4- and 8-element stationary arrays. A reconstruction algorithm, rotating SENSitivity Encoding (rotating SENSE), was proposed to provide image reconstruction. Additionally, by optimally choosing the angular sampling positions and transmit profiles under the rotating scheme, phantom images could be faithfully reconstructed. The results indicate that, the proposed technique is able to provide homogeneous reconstructions with overall higher and more uniform signal-to-noise ratio (SNR) distributions at high reduction factors. It is hoped that, by employing the high imaging acceleration and homogeneous imaging reconstruction ability of RRFCA, the proposed method will facilitate human imaging for ultra high field MRI.

KEYWORDS:

7 Tesla; Homogeneous image reconstruction; Method of Moments (MoM); Parallel imaging; Phantom experiment; Phased array coils; Rotating RF coil (RRFC); Rotating RF coil array (RRFCA); SENSitivity Encoding (SENSE); SNR

PMID:
24365100
DOI:
10.1016/j.jmr.2013.11.002
[Indexed for MEDLINE]
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