医疗器械磁致位移力测试的空间选点研究

Research on Choosing Position for Measurement of Magnetically Induced Displacement Force on Medical Devices

金属植入物在磁共振环境下,会受到位移力的作用,该文通过实验设计,对全部空间位置的磁场进行测量,结合计算机数据处理,在核磁共振环境位移力可评价区域,找出了极限位置的空间坐标。对未达到磁饱和的器械,最大偏移位置位于空间梯度与梯度变化乘积最大点处;对达到磁饱和的器械,最大偏移位置位于空间梯度变化最大点处。

Metal implants will be affected by force in the magnetic resonance environment, this paper's experiment measured all the spatial position of the magnetic field,combining with computer, found out the limit conditional position in the space available in the magnetic resonance environment. For devices below saturation, the location of maximum deflection is at the point where the multiply value of the magnitude of the magnetic field and the magnitude of the spatial gradient of the magnetic field is maximum. Above the magnetic saturation point, the maximum deflection will occur at the location where the magnitude of the magnetic field is maximum.