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在磁共振成像中,磁共振兼容金属植入物的磁化率较高,从而导致图像信号的缺失与失真,严重影响装置的精准定位和评估。2014年,有学者提出一种正对比成像方法,利用偏移180°回聚脉冲的自旋回波序列,结合特有的定量磁化率重建算法,重建出近距离放射颗粒的正对比图像。在此基础上,文章对该方法进行进一步扩展,在西门子3 T人体磁共振成像系统上,将该方法应用到活检针和过滤器等较大金属介入装置的正对比成像。活检针和过滤器水模磁共振成像实验结果表明,这种正对比成像方法可应用于较大的金属装置,有效地抑制了金属伪影,获得清晰的正对比图像,提高了装置定位和评估的精准度。
Magnetic resonance imaging in magnetic resonance imaging compatible metal implants higher susceptibility, resulting in the loss of the image signal and distortion, seriously affecting the device’s precise positioning and assessment. In 2014, some scholars proposed a method of positive contrast imaging, using a spin echo sequence with a 180 ° offset polypoid pulse, combined with a specific quantitative magnetic susceptibility reconstruction algorithm to reconstruct the positive contrast image of close-spaced radioactive particles. On the basis of this, the article further expands this method and applies this method to the positive contrast imaging of larger metal intervention devices such as biopsy needles and filters on Siemens 3 T human body MRI system. Biopsy needle and filter water-based magnetic resonance imaging experiments show that this positive contrast imaging method can be applied to larger metal devices, effectively inhibit the metal artifacts, get a clear positive contrast image, improve the device positioning and evaluation Accuracy.