Mortazavy Beni Hamidreza, Aghaei Fatemeh, Heydarian Ashkan, Asaei Fatemeh Yekta, Samaram Hosein
Department of Biomedical Engineering, Ars. C., Islamic Azad University, Arsanjan, Iran.
Neuromusculoskeletal Rehabilitation Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Biomed Eng Comput Biol. 2025 Jul 10;16:11795972251353069. doi: 10.1177/11795972251353069. eCollection 2025.
Magnetic Resonance Imaging (MRI) is a non-invasive imaging method that utilizes radio waves and magnetic fields. This study focuses on reducing the acoustic noise produced inside the cylindrical shell of the scanner, where the patient is located. Vibration modes are generated by eddy currents in the cylindrical shell induced by gradient magnetic fields. Additionally, the scanner wall is typically joined to the gradient spiral cylinder, causing vibrations to be transmitted to the wall and thereby producing extra sound waves. The present study investigates methods for mitigating noise from the scanner wall and reducing the transmission noise from the spiral gradient cylinder. Numerical methods and practical solutions for lowering acoustic noise in MRI gradient coils are explored. A 20 mm uniform absorber is demonstrated as an effective design for significantly reducing acoustic noise in the frequency range 0 to 3 kHz. Finally, numerical analysis of gradient cycles yields solutions that lower both vibration and noise levels.
磁共振成像（MRI）是一种利用无线电波和磁场的非侵入性成像方法。本研究聚焦于降低扫描仪圆柱形外壳内部（患者所在位置）产生的声学噪声。振动模式由梯度磁场在圆柱形外壳中感应产生的涡流所引发。此外，扫描仪壁通常与梯度螺旋圆柱体相连，导致振动传递至壁面，进而产生额外的声波。本研究探讨了减轻扫描仪壁噪声以及降低螺旋梯度圆柱体传输噪声的方法。探索了降低MRI梯度线圈声学噪声的数值方法和实际解决方案。一个20毫米的均匀吸收器被证明是一种有效的设计，可在0至3千赫兹频率范围内显著降低声学噪声。最后，梯度周期的数值分析得出了降低振动和噪声水平的解决方案。
