Shellock F G, Habibi R, Knebel J
Keck School of Medicine, University of Southern California and Institute for Magnetic Resonance Safety, Education, and Research, Los Angeles, Calif 90045, USA.
AJNR Am J Neuroradiol. 2006 Mar;27(3):661-5.
A programmable CSF shunt valve was assessed for magnetic field interactions, heating (transmit-receive body radio-frequency coil; whole-body averaged specific absorption rate, 2.1 W/kg), functional alterations, and artifacts at 3T. The programmable valve showed minor magnetic field interactions and heating was not excessive (+0.8 degrees C). The function of the programmable valve was not altered by multiple exposures to the 3T scanner or from exposure to various MR imaging conditions. Therefore, this implant is safe for a patient undergoing MR imaging at 3T or less when the radiologist follows specific safety guidelines. Artifacts for the programmable valve were relatively large in relation to the size and shape of the valve; this finding may impact the diagnostic use of MR imaging if the area of interest is in proximity to this implant.
对一种可编程脑脊液分流阀进行了评估，以确定其在3T磁场下的磁场相互作用、发热情况（发射-接收体射频线圈；全身平均比吸收率，2.1W/kg）、功能改变及伪影。该可编程阀显示出轻微的磁场相互作用，发热也不过高（+0.8摄氏度）。多次暴露于3T扫描仪或不同的磁共振成像条件下，可编程阀的功能未发生改变。因此，当放射科医生遵循特定的安全指南时，对于接受3T及以下磁共振成像检查的患者，这种植入物是安全的。该可编程阀的伪影相对于阀的大小和形状来说比较大；如果感兴趣区域靠近该植入物，这一发现可能会影响磁共振成像的诊断应用。
