Schenck J F
General Electric Corporate Research and Development Center, Schenectady, New York 12309, USA.
Magn Reson Imaging Clin N Am. 1998 Nov;6(4):715-30.
MR imaging requires the exposure of human patients to magnetic fields that are much more intense than ever occur naturally. Under most circumstances, however, these fields do not appear to pose a health or safety risk even at levels well above those currently in clinical use. This margin of safety results from the extreme weakness of the diamagnetic interaction between human tissues and magnetic fields. Ferromagnetic materials, however, present either as implants within the patient or inadvertently introduced into the scanner environment, pose significant risks and must be scrupulously avoided. At very high field strengths, there is evidence for mild sensory effects, such as vertigo and metallic tastes, which do not appear to be harmful.
磁共振成像需要让人类患者暴露于比自然环境中出现的磁场强度高得多的磁场中。然而，在大多数情况下，即使在远高于目前临床使用的磁场强度水平下，这些磁场似乎也不会对健康或安全构成风险。这种安全边际源于人体组织与磁场之间抗磁相互作用的极端微弱性。然而，铁磁性材料，无论是作为患者体内的植入物还是无意中进入扫描环境，都会带来重大风险，必须严格避免。在非常高的场强下，有证据表明存在轻微的感官效应，如眩晕和金属味，但这些似乎并无危害。
