Evaluation of an independent linear model for acoustic noise on a conventional MRI scanner and implications for acoustic noise reduction.
Evaluation of an independent linear model for acoustic noise on a conventional MRI scanner and implications for acoustic noise reduction.
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DOI：
10.1002/mrm.24798
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发表时间：
2014-04
影响因子：
3.3
通讯作者：
Nayak, Krishna S.
中科院分区：
文献类型：
--
作者：
Wu, Ziyue;Kim, Yoon-Chul;Khoo, Michael C. K.;Nayak, Krishna S.
评价常规MRI扫描仪上梯度声噪声的独立线性模型，并探讨常规成像中声噪声降低的意义。从每个物理梯度轴产生的声学噪声被建模为通过线性时不变系统的规定的梯度波形。实验确定了均匀性和叠加特性。我们还开发了一种新的方法来校正不同物理梯度轴的测量脉冲响应之间的相对时移。通过使用归一化能量差比较预测和测量的声音来确定模型精度。传递函数也被测量在不同的体型和在多个麦克风位置的主题。每个物理梯度轴的叠加性和均匀性都保持在3%以内。当所有梯度同时开启时，经过时移校正后，声音预测误差从32%降低到4%。传递函数对体型和麦克风位置也表现出很高的敏感性。独立线性模型预测MRI声学噪声，误差小于4%。声学传递函数对身体体型和在孔内的位置高度敏感，使得产生基于避免系统共振峰的声学降噪的一般方法具有挑战性。
To evaluate an independent linear model for gradient acoustic noise on a conventional MRI scanner, and to explore implications for acoustic noise reduction in routine imaging. Acoustic noise generated from each physical gradient axis was modeled as the prescribed gradient waveform passed through a linear time-invariant system. Homogeneity and superposition properties were experimentally determined. We also developed a new method to correct relative time shifts between the measured impulse responses for different physical gradient axes. Model accuracy was determined by comparing predicted and measured sound using normalized energy difference. Transfer functions were also measured in subjects with different body habitus and at multiple microphone locations. Both superposition and homogeneity held for each physical gradient axis with errors less than 3%. When all gradients were on simultaneously, sound prediction error was reduced from 32% to 4% after time-shift correction. Transfer functions also showed high sensitivity to body habitus and microphone location. The independent linear model predicts MRI acoustic noise with less than 4% error. Acoustic transfer functions are highly sensitive to body habitus and position within the bore, making it challenging to produce a general approach to acoustic noise reduction based on avoiding system resonance peaks.
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影响因子：
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通讯作者：
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