金属冠脉支架磁共振适用性检测方法

Methods of Magnetic Resonance Compatibility Testing for Metal Coronary Stents

目的:建立金属冠脉支架磁共振适用性实验平台,以实验室测试为基础,研究金属冠脉支架的磁共振适用性。方法:金属冠脉支架磁共振适用性试验分为四个部分,在3T磁共振环境下,分别进行磁位移力试验、磁扭矩试验、致热试验和图像干扰试验。结果:退磁效果好的金属冠脉支架,磁位移力小于其自身重力,磁扭矩小于其自身重力扭矩,温度升高值小,图像畸变值小。退磁效果不好的支架,磁位移力大于其自身重力,温度升高多,图像畸变值大。结论:实验平台可以对金属冠脉支架磁共振适用性进行检测,并对其退磁效果进行评价。

Objective： To establish an experimental platform for magnetic resonance compatibility for mental coronary stents and to study the magnetic resonance compatibility based on laboratory testing. Methods： The magnetic resonance compatibility testing for metal coronary stents was divided into four parts, which was conducted in the 3T magnetic resonance imaging environment, including magnetically induced displacement force test, magnetically induced torque test, heating test and image interference test. Results： For metal coronary stents with good demagnetization effect, the magnetically induced displacement force was lower than its own gravity, the magnetically induced torque was lower than its gravity-induced torque, its temperature increased in low amplitude, and the value of image distortion was small. By contrast for metal coronary stents with poor demagnetization effect, the magnetically induced displacement force was higher than its own gravity, the increase amplitude of its temperature was high, and the value of image distortion was large. Conclusion： The experimental platform can be applied to test magnetic resonance compatibility for coronary mental stents and evaluate its demagnetization effect.