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
收藏
页码：754 / 762
页数：9
相关论文
共 36 条
[1]  
ADRIANY G, 2007, P 15 ANN M ISMRM BER
[2]  
*BRIT STAND ORG, 1995, HEAD FORMS US TEST P
[3]  
CLINE H, 2004, P 12 ANN M ISMRM KYO
[4]   Signal-to-noise measurements in magnitude images from NMR phased arrays [J].
Constantinides, CD ;
Atalar, E ;
McVeigh, ER .
MAGNETIC RESONANCE IN MEDICINE, 1997, 38 (05) :852-857
[5]   Maximizing signal-to-noise ratio in the presence of coil coupling [J].
Duensing, GR ;
Brooker, HR ;
Fitzsimmons, JR .
JOURNAL OF MAGNETIC RESONANCE SERIES B, 1996, 111 (03) :230-235
[6]  
HARDY C, 2007, P 15 ANN M ISMRM BER
[7]   Large field-of-view real-time MRI with a 32-channel system [J].
Hardy, CJ ;
Darrow, RD ;
Saranathan, M ;
Giaquinto, RO ;
Zhu, YD ;
Dumoulin, CL ;
Bottomley, PA .
MAGNETIC RESONANCE IN MEDICINE, 2004, 52 (04) :878-884
[8]  
Hergt M, 2007, P 15 ANN M ISMRM BER
[9]  
KELLMAN P, 1990, MAGN RESON MED, V16, P192
[10]  
KING KF, 2001, P 9 ANN M ISMRM GLAS
1234