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Home > ÇÐȸȰµ¿ > ±¹Á¦ÇмúÁö |
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ÀÛ¼ºÀÏ : 10-10-29 16:46
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Dong-Cheol Woo et al |
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Evaluation of the turn variation of spiral RF surface coils for MR microscopic imaging and spectroscopy |
ÇÐȸÁö¸í |
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Measurement |
±Ç È£ |
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40 |
ÆäÀÌÁö |
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615-622 |
³â,¿ù |
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2007-2-1 |
¸µ Å© |
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Abstract |
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The purpose of this study was to enhance the technical improvement so as to develop an advanced sensitive RF surface
coil for investigating the sensitivities of the multi-spiral surface coils, and we eventually wanted to achieve high resolution
of the microscopic MR images and MR spectra. The magnetic field inhomogeneity and the shape of a surface coil were
statistically estimated by simulation of the magnetic field distribution.
On the basis of the experimental results with single, three- and five-turned spiral RF surface coils in 1.5 T, we found that
the three-turned coil had the highest sensitivity. The present study showed that the sensitivity of the RF surface coil was
improved by increasing the number of spiral coil turns, and also the SNR of the RF surface coil was dependent upon the
number of spiral coil turns. However, we found, rather strikingly, that the sensitivity of excessive turns of the coils was
decreased due to the rise of the coil¡¯s impedance. Thus, the present results demonstrated that the sensitivity was not proportional
to the number of a spiral RF coil¡¯s turns, and the number of spiral coil turns should be optimized for obtaining
the highest sensitivity and SNR. |
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