3.0T MRI胸椎扫描中联合线圈单元开放对图像质量的影响

Influence of dual coil elements′ opening on the quality of the images in 3.0T MR thoracic scan

目的:探讨不同的联合线圈单元开放方法在3.0T MRI胸椎扫描中对图像质量的影响,筛选最佳扫描方案。方法:应用3.0T MR机联合线圈(NV线圈及SPINE线圈)对20例患者行胸椎扫描,分别获得不同线圈单元开放的T1WI压脂增强(SPIR)序列图像,测量图像的信噪比(SNR)及对比度噪声(CNR),比较其图像质量是否存在差异。结果:20例中使用NV线圈开放NPC单元结合SPINE线圈开放ABC单元(即NPC-ABC,A组)图像的SNR-Ⅰ(上段胸椎)及CNR-Ⅰ均高于使用NV线圈开放PC单元结合SPINE线圈开放ABCD单元(即PC-ABCD,B组),SNR-Ⅰ分别为70.11±5.38和16.37±4.76(P<0.05),CNR-Ⅰ分别为15.11±4.62和7.90±4.48,两组间差异有统计学意义(P<0.05);而NPC-ABC与PC-ABCD的SNR-Ⅱ(即中段胸椎)及NPC-ABC与PC-ABCD的SNR-Ⅲ(即下段胸椎)间差异均无统计学意义。A组序列上段胸椎图像的主观评分为3.6±0.4,B组为2.7±0.5。结论:使用NV线圈开放NPC单元结合SPINE线圈开放ABC单元得出的上段胸椎图像质量最好,可作为常规扫描方案。

Objective：To discuss the influence of the dual coil elements＇ opening on the quality of the images in 3.0T MR thoracic scan, in order to choose the best scanning program. Methods：Thoracic scan was performed in 20 patients with 3.0T MR scanner （Philips Intera Aehieva） and dual coil （NV coil ＆ SPINE coil）,T1WI SPIR±C sequence images of dif-ferent dual coil elements were obtained respectively,their different SNR and CNR were measured and compared to observe the difference of their image quality. Results：Of all 20 patients,on NV coil opening elements NPC and using sense spine coil opening elements ABC （NPC-ABC,group A） ,the SNR Ⅰ and CNR Ⅰ both were higher than those by using NV coil opening elements PC and using sense spine coil opening elements ABCD （PC-ABCD, group B）, SNR Ⅰ was 70. 11 ± 5. 38 and 16. 37±4. 76 （P〈0.05） respectively,CNRI was 15. 11±4. 62 and 7. 90±4.48 respectively,there was significant diffe- rence （P〈0.05）. There were no significant differences between the SNR Ⅱ ,CNR Ⅱ of NPC ABC,PC-ABCD and SNRⅢ , CNRⅢ （P〉0.05）. The subjective scoring of upper thoracic imaging in group A was 3.6±0.4 and in group B was 2.7±0.5. Conclusion： The quality of upper thoracic imaging by using NV coil opening elements NPC and sense spine coil opening elements ABC was better,which can be used as a routine scanning program.