金属置入物患者行3.0T MR检查的安全性探讨

Safety of 3.0T MR Examination in Patients with Metal Implants

目的:探讨金属置入物在超高场3.0T MR中的安全性,为该类患者MRI检查提供依据。方法:收集金属置入物患者40例,平均70.9岁。置入物包括节育环、人工股骨头、钛网,心脏支架、动脉支架等。置入到扫描时间:半年～5年,平均2年。扫描部位:头、脊柱、腹部、前列腺、血管等。3.0T MR扫描,扫描时间10～25min,平均15min。记录检查前、检查后即刻、检查后3d生理指标和不适症状,并作统计学分析。图像进行质量评估。结果:3个时间段生理指标稳定,无统计学意义(P>0.05)。全部病例未发生由检查引发的不良反应。图像符合诊断要求。结论:在确认金属置入物是非铁磁性或弱磁性的前提下,行3.0T M R检查是安全的。根据置入物情况选择感兴趣区能避免金属伪影干扰。

Purpose： Safety issue of patients with was discussed, in order to provide the evidence of metal implants in high - field 3.0T MR examination MRI examination in these patients. Methods： Forty cases of patient with medical metal implants were included in the study with an average age of 70.9 years. The implants include intrauterine contraceptive devices, artificial femoral head, cervical titanium mesh cage, coronary artery stents and lower extremity arterial stent. The intervals between the implantation and MRI examination ranged from 6 months to 5 years, with an average of 2 years. The ranges of scan included head, spine, abdomen, prostate and blood vessel, etc. The examinations were performed in a 3.0T MR with a scan time from 10 to 25 minutes with an average of 15 minutes. Physical indexes and body complaints （if any） were recorded in three phases which were： before, soon after and 3 days after the examination. Image quality was analyzed and statistical analysis was performed. Results： Physical indexes obtained in the three phases were stable and showed no statistical difference （P 〉 0.05）. No side effect from the MRI examination was recorded. Image quality satisfied diagnostic requirement. Con- clusion： 3.0T MR examination in the patients with metal implants is safe on condition that the implants are non - ferromagnetic or weakly ferromagnetic. Careful selection of ROI according to the implants is helpful to avoid metal artifact.