期刊
NEUROIMAGE
卷 86, 期 -, 页码 35-42出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2013.04.077
关键词
MRS; MRI; Multi-element receive coil; SNR
资金
- Dr Hadwen Trust
- Dr Hadwen Trust for Humane Research (DHT)
- MRC [G0901321] Funding Source: UKRI
- Medical Research Council [G0901321] Funding Source: researchfish
State of the art magnetic resonance imaging (MRI) scanners are generally equipped with multi-element receive coils; 16 or 32 channel coils are common. Their development has been predominant for parallel imaging to enable faster scanning. Less consideration has been given to localized magnetic resonance spectroscopy (MRS). Multinuclear studies, for example P-31 or C-13 MRS, are often conducted with a single element coil located over the region of interest. H-1 MRS studies have generally employed the same multi-element coils used for MRI, but little consideration has been given as to how the spectroscopic data from the different channels are combined. In many cases it is simply co-added with detrimental effect on the signal to noise ratio. In this study, we derive the optimum method for combining multi-coil data, namely weighting with the ratio of signal to the square of the noise. We show that provided that the noise is uncorrelated, this is the theoretical optimal combination. The method is demonstrated for in vivo proton MRS data acquired using a 32 channel receive coil at 7 T in four different brain areas; left motor and right motor, occipital cortex and medial frontal cortex. (C) 2013 Elsevier Inc. All rights reserved.
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