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KMID : 0357520150380040403
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Journal of Radiological Science and Technology
2015 Volume.38 No. 4 p.403 ~ p.410
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A Study on Evaluating Validity of SNR Calculation Using a Conventional Two Region Method in MR Images Ap p lied a Multichannel Coil and Parallel Imaging Technique
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Choi Kwan-Woo
Son Soon-Yong
Min Jung-Whan
Kwon Kyung-Tae
Yoo Beong-Gyu
Lee Jong-Seok
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Abstract
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The purpose of this study was to investigate the problems of a signal to noise ratio measurement using a two region measurement method that is conventionally used when using a multi-channel coil and a parallel imaging technique. As a research method, after calculating the standard SNR using a single channel head coil of which coil satisfies three preconditions when using a two region measurement method, we made comparisons and evaluations after calculating an SNR by using a two region measurement method of which method is problematic because it is used without considering the methods recommended by reputable organizations and the preconditions at the time of using a multi-channel coil and a parallel imaging technique. We found that a two region measurement method using a multi-channel coil and a parallel imaging technique shows the highest relative standard deviation, and thus shows a low degree of precision. In addition, we found out that the difference of SNR according to ROI location was very high, and thus a spatial noise distribution was not uniform. Also, 95% confidence interval through Blend-Altman plot is the widest, and thus the conformity degree with a two region measurement method using the standard single channel head coil is low. By directly comparing an AAPM method, which serves as a standard of a performance evaluation test of a magnetic resonance imaging device under the same image acquisitionconditions, an NEMA method which can accuratelydetermine the noise level in a signal region and the methods recommended by manufacturers of a magnetic resonance imaging device, there is a significance in that we quantitatively verified the inaccurate problems of a signal to noise ratio using a two region measurement method when using a multi-channel coil and a parallel imaging technique of which method does not satisfy the preconditions that researchers could overlook.
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KEYWORD
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SNR, Signal to noise ratio, Two region method, AAPM, NEMA, Rician noise tribution
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