96-Channel Receive-Only Head Coil for 3 Tesla: Design Optimization and Evaluation

被引：226

作者：

Wiggins, Graham C. ^{[1
]}

Polimeni, Jonathan R. ^{[1
]}

Potthast, Andreas ^{[2
]}

Schmitt, Melanie ^{[1
]}

Alagappan, Vijay ^{[1
]}

Wald, Lawrence L. ^{[1
,3
]}

机构：

[1] Massachusetts Gen Hosp, Dept Radiol, Charlestown, MA USA

[2] Siemens Healthcare, Erlangen, Germany

[3] Harvard MIT Div Hlth Sci Technol, Cambridge, MA USA

来源：

MAGNETIC RESONANCE IN MEDICINE | 2009年 / 62卷 / 03期

基金：

美国国家卫生研究院;

关键词：

phased array; 96-channel; RF coil design; SNR; g-factor; TO-NOISE RATIO; CARDIAC COIL; ARRAY; MRI; SYSTEM;

D O I：

10.1002/mrm.22028

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

The benefits and challenges of highly parallel array coils for head imaging were investigated through the development of a 3T receive-only phased-array head coil with 96 receive elements constructed on a close-fitting helmet-shaped former. We evaluated several designs for the coil elements and matching circuitry, with particular attention to sources of signal-to-noise ratio (SNR) loss, including various sources of coil loading and coupling between the array elements. The SNR and noise amplification (g-factor) in accelerated imaging were quantitatively evaluated in phantom and human imaging and compared to a 32-channel array built on an identical helmet-shaped former and to a larger commercial 12-channel head coil. The 96-channel coil provided substantial SNR gains in the distal cortex compared to the 12- and 32-channel coils. The central SNR for the 96-channel coil was similar to the 32-channel coil for optimum SNR combination and 20% lower for root-sum-of-squares combination. There was a significant reduction in the maximum g-factor for 96 channels compared to 32; for example, the 96-channel maximum g-factor was 65% of the 32-channel value for acceleration rate 4. The performance of the array is demonstrated in highly accelerated brain images. Magn Reson Med 62:754-762, 2009. (C) 2009 Wiley-Liss, Inc.

引用

页码：754 / 762

页数：9

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