摘要
目的探讨最新标准牌号金属植入物MRI扫描安全性。方法选择螺钉、锁骨锁定板、桡骨锁定板、肱骨远端锁定板、胫骨髓内钉、股骨髓内钉、骨折重建钢板等,按材料成分分为钛合金组和不锈钢组。将金属植入物(钛合金、不锈钢)在1.5 T MRI下进行受力实验,测定磁场下的偏转角度。结果钛合金组和不锈钢组在1.5 T MRI待机状态下均受磁场吸引而受力偏转,钛合金组偏转角度4.60°±0.22°,不锈钢组偏转角度7.80°±0.25°,两者偏转角度差异有显著统计学意义(P<0.01)。不锈钢组偏转角度大于钛合金组,但两者都远小于45°。结论从受力情况看,最新标准牌号钛合金植入物和不锈钢植入物在1.5 T MRI待机状态下均受磁场吸引而受力偏转,但受到的磁力远小于自身重力。单从受力方面看,2种金属植入物在1.5 T MRI下检查是安全的。
Objective To investigate the safety of the latest standard brands metal implants for magnetic resonance imaging（MRI）. Methods The screw, clavicle locking plate, radius locking plate, distal humerus locking plate, intramedullary nail,femoral intramedullary nail and fracture reconstruction plate were collected and divided into titanium alloy group and stainless steel group accorded to material composition. The metal implants（titanium alloy and stainless steel） were performed stress test at1.5 Tesla MRI, and deflection angles of magnetic field were measured. Results Both titanium alloy group and stainless steel group produced magnetic deflection at standby model of 1.5 Tesla MRI, deflection angle of titanium alloy group and stainless steel group were 4.60° ± 0.22° and 7.80° ± 0.25°, respectively, and the differences between 2 groups were significant（P〈 0.01）. The deflection angle of stainless steel group was higher than that of titanium alloy group, and both of them were less than 45°. Conclusion It is demonstrated that the latest standard brands titanium alloy implants and stainless steel implants produce magnetic deflection on standby model at 1.5 Tesla MRI, but the magnetic force is much lower than its own gravity. The stress analysis for 2 kinds of metal implants are safe at 1.5 Tesla MRI in force.
出处
《生物医学工程与临床》
CAS
2015年第5期460-463,共4页
Biomedical Engineering and Clinical Medicine
基金
江苏高校优势学科建设工程基金资助(JX10231801)
