摘要
目的探讨PROPELLER(螺旋浆)技术对改善颅脑MRI检查时运动伪影的临床应用价值。方法6例健康志愿者进行静止状态、摇头和点状动作时的MRI检查,以及50例临床受检者,均行PROPELLER-T2WI和FSE-T2WI横轴面扫描。使用GE Signa HD1.5T双梯度磁共振扫描仪。选取受检者同一层面的FSE-T2WI和PROPELLER-T2WI图像,由3位高年资的影像科医师,对其图像质量进行评价,分析图像的运动伪影和优质片率状况,采用统计学χ2检验。结果正常健康志愿者6例,选取136个层面的272幅图像进行比较,使用PROPELLER-T2WI扫描序列比采用常规FSE-T2WI扫描序列所获得的图像运动伪影明显减少(χ2=1012.829,P<0.001),优质图像的显示率明显提高(χ2=187.049,P<0.001);临床受检者50例,选取320个层面的640幅图像进行比较,使用PROPELLER-T2WI扫描序列比采用常规FSE-T2WI扫描序列所获得的图像运动伪影明显减少(χ2=318.418,P<0.001),优质图像的显示率明显提高(χ2=1047.273,P<0.001),对颅内病变的显示能力,PROPELLER-T2WI优于FSE-T2WI,PROPELLER-T2WI对小病灶显示有较好的清晰度。结论PROPELLER-MRI解决了显著头动患者进行MRI检查提供一种可能,避免对躁动患者实施药物镇静或进行全身麻醉,PROPELLER MRI具有较高临床实用价值。
Objectives To evaluate the efficacy of PROPELLER MRI in the improvement of movement artefact on brain imaging. Methods： Axial PROP-T2WI and conventional FSE-T2WI with lying still, head movement （shake ＂no＂ and nod ＂yes＂） were performed in six normal volunteers. On 50 clinical subjects,axial FSE-T2WI （19 slices, 6mm thickness, TR 4200ms,TE 127ms,Matrix 384×256, field of view 24cm, Nex 2, Scans time 122s） and PROP- T2WI （19 slices, 6mm thickness,TR 5000ms, TE 102ms, Matrix 320×320, field of view 24cm, Nex 1.5, Scans time 95s） were acquired with 1.5Tesla GE Signa HD scanner. The images of FSE T2WI and PROP-T2WI with same slice were selected and the images were reviewed by three senior radiologists for motion artifact as well as overall imaging quality. Results：In the 6 normal volunteers, 136 slices （272 images） were selected and compared,the movement artefact using PROP-T2WI was obviously less than that of conventional FSE T2WI （χ^2= 1012. 829, P〈0. 001） ; the overall image quality was markedly improved （χ^2= 187. 049, P〈0. 001）. For the 50 clinical patients, the motion artifact was less commonly seen and the image quality was improved when PROP-T2WI was compared with conventional FSE-T2WI as well （ χ^2 318.418, P〈0.001 ; χ^2 = 1047.273, P〈0. 001 respectively）. PROPELLER was preferred over conventional in all subjects. Intracranial pathology was better demonstrated with PROPELLER. Conclusion：PROPELLER MRI offers a novel means of reducing motion artifact and improving imaging quality for head motion. It offers important benefits for brain imaging in all subjects regardless of motion.
出处
《放射学实践》
2007年第2期200-204,共5页
Radiologic Practice
关键词
磁共振成像
颅脑
图像质量
运动伪影
Magnetic resonance imaging
Brain
Image quality
Motion artifact
作者简介
钱根年（1968-），男，浙江嘉兴人，主管技师，主要从事CT、MR成像技术研究工作。
