Fagan Andrew J, Amrami Kimberly K, Watson Robert E, Anjum Muhammad A R, Welker Kirk M
Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA.
J Magn Reson Imaging. 2025 Jun;61(6):2644-2647. doi: 10.1002/jmri.29656. Epub 2024 Nov 7.
Extremely severe nausea was experienced by four subjects positioned prone on a 7T scanner table with their arm extended overhead for a wrist examination and their head positioned approximately 10-20 cm above the magnet's central axis. Movement through the large static and spatial field gradients of current 7T MRI scanner magnets typically causes mild vestibular activation which is well tolerated by most individuals. However, when positioned off-axis, the head moves through regions of even larger and more rapidly changing magnetic fields which in the current study were sufficient to induce the extremely severe nausea. Ensuring the head remains on-axis mitigates this effect.
四名受试者趴在7T扫描仪检查台上，手臂向上伸展进行手腕检查，头部位于磁体中心轴上方约10 - 20厘米处，他们都经历了极其严重的恶心。通过当前7T MRI扫描仪磁体的大静态和空间场梯度移动通常会引起轻度前庭激活，大多数人对此耐受性良好。然而，当头部偏离轴位时，会穿过更大且变化更快的磁场区域，在本研究中，这些磁场足以诱发极其严重的恶心。确保头部保持在轴位可减轻这种影响。
