The purpose of this NEMA Standards Publication is to provide methods to determine the acoustic noise level of an MR system. Two measurement procedures are defined@ Maximum Gradient Acoustic Noise (MGAN) and Maximum Clinical Acoustic Noise (MCAN).This procedure has been designed for measuring peak sound pressure levels (SPL) up to 140 dB. Above 140 dB@ the use of more sophisticated equipment and methods may be required.
MS 4-2006由NEMA - National Electrical Manufacturers Association 发布于 2006-01-01,并于 2010-10-26 实施。
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