Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 229, Issue -, Pages 75-89Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2013.02.001
Keywords
Magnetic Resonance Imaging; RF coil; Phased-array; Parallel imaging; Signal-to-noise ratio
Funding
- NIH [P41RR014075]
- NIH Blueprint Initiative
- the Human Connectome Project [U01MH093765]
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Originally proposed as a method to increase sensitivity by extending the locally high-sensitivity of small surface coil elements to larger areas via reception, the term parallel imaging now includes the use of array coils to perform image encoding. This methodology has impacted clinical imaging to the point where many examinations are performed with an array comprising multiple smaller surface coil elements as the detector of the MR signal. This article reviews the theoretical and experimental basis for the trend towards higher channel counts relying on insights gained from modeling and experimental studies as well as the theoretical analysis of the so-called ultimate SNR and g-factor. We also review the methods for optimally combining array data and changes in RF methodology needed to construct massively parallel MRI detector arrays and show some examples of state-of-the-art for highly accelerated imaging with the resulting highly parallel arrays. (C) 2013 Elsevier Inc. All rights reserved.
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