Cho Z H, Park S H, Kim J H, Chung S C, Chung S T, Chung J Y, Moon C W, Yi J H, Sin C H, Wong E K
Department of Radiological Sciences, University of California, Irvine 92679, USA.
Magn Reson Imaging. 1997;15(7):815-22. doi: 10.1016/s0730-725x(97)00090-8.
Acoustic or sound noise due to gradient pulsing has been one of the problems in magnetic resonance imaging (MRI), both in patient scanning as well as in many areas of psychiatric and neuroscience research such as functional MRI. Our recent observations in functional MRI for the visual and motor cortex show very different results with sound noise in comparison with the results obtained without sound noise. Although a number of ideas have been suggested in the literature about the possible elimination or reduction of sound noise, progress has been slow due to the basic role of gradient pulsing in MR imaging. Before we tackle the sound-noise-reduction problem, we believe that a systematic study of sound or acoustic noise behavior will provide important information for future endeavors in this area of research in MRI systems, in both commercial and research systems. Therefore, we report on some typical behavior of sound noise observed from MRI scanners and the analyses of their characteristics. Data are obtained both from a commercial MRI scanner (GE Signa 1.5-T EPI system) as well as a research-type MRI scanner (KAIS 2.0-T) developed at a university laboratory setting.
由于梯度脉冲产生的声学噪声一直是磁共振成像（MRI）中的问题之一，无论是在患者扫描中，还是在精神病学和神经科学研究的许多领域，如功能磁共振成像中。我们最近在视觉和运动皮层功能磁共振成像中的观察结果表明，与无声音噪声时获得的结果相比，声音噪声产生的结果有很大不同。尽管文献中已经提出了一些关于可能消除或降低声音噪声的想法，但由于梯度脉冲在磁共振成像中的基本作用，进展一直很缓慢。在我们解决降低声音噪声的问题之前，我们认为对声音或声学噪声行为进行系统研究将为未来在商业和研究系统的磁共振成像系统这一研究领域的努力提供重要信息。因此，我们报告了从MRI扫描仪观察到的一些典型声音噪声行为及其特征分析。数据来自一台商用MRI扫描仪（GE Signa 1.5-T EPI系统）以及在大学实验室环境中开发的研究型MRI扫描仪（KAIS 2.0-T）。
