AN ADJUSTABLE RF COIL LOADING DEVICE

被引：8

作者：

HAYES, CE

机构：

[1] Applied Science Laboratory, General Electric Medical Systems, Waukesha

来源：

MAGNETIC RESONANCE IMAGING | 1993年 / 11卷 / 01期

关键词：

RF COIL LOADER; PATIENT LOSS SIMULATOR;

D O I：

10.1016/0730-725X(93)90415-A

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：

This paper describes an adjustable loading device that can substitute for the tissue losses of various sized patients in a whole-body MR imager. It resembles a lowpass birdcage resonator but with resistors replacing the capacitors on the cylindrical surface. Power dissipated is a monotonic function of the total surface conductance of the loader. The loader can be used in conjunction with a low loss water filled phantom to measure signal-to-noise ratios (SNR). The impact on measured SNR due to screening by the loader and changing the phantom size or composition are also briefly discussed.

引用

页码：81 / 86

页数：6

共 13 条

[1] Roemer, Edelstein, Hayes, Souza, Mueller, The NMR phased array, Magn. Reson. Med., 16, pp. 192-225, (1990)
[2] Hayes, Roemer, Noise correlations in data simultaneously acquired from multiple surface coil arrays, Magn. Reson. Med., 16, pp. 181-191, (1990)
[3] Hayes, Hattes, Roemer, Volume imaging with MR phased arrays, Magn. Reson. Med., 18, pp. 309-319, (1991)
[4] Hayes, Dietz, King, Ehman, Pelvic imaging using phased array coils: Quantitative assessment of SNR improvement, J. Magn. Reson. Imaging, 2, pp. 321-326, (1992)
[5] Hoult, Lauterbur, The sensitivity of the zeugmatographic experiment involving human samples, J. Magn. Reson., 34, pp. 425-433, (1979)
[6] Hoult, Richards, The signal-to-noise ratio of the nuclear magnetic resonance experiment, J. Magn. Reson., 24, pp. 71-85, (1976)
[7] Mansfield, Morris, NMR Imaging in Biomedicine, pp. 184-191, (1982)
[8] Glover, Hayes, Pelc, Edelstein, Mueller, Hart, O'Donnell, Barber, Comparison of linear and circular polarization for magnetic resonance imaging, J. Magn. Reson., 64, pp. 255-270, (1985)
[9] Foo, Hayes, Kang, An analytical model for the design of RF resonators for MR body imaging, Magn. Reson. Med., 21, pp. 165-177, (1991)
[10] Roeschman, Radiofrequency penetration and absorption in the human body: Limitations to high-field whole-body nuclear magnetic resonance imaging, Med. Phys., 14, pp. 922-931, (1987)

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