呼吸导航3D BTFE与双反转TSE序列对冠状动脉成像质量的评价  

Evaluation of MR Respiratory Navigator 3D BTFE and Dual IR TSE in Imaging Quality of Coronary MR Angiography

作　　者：徐孝秋[1] 郭建锋[1] 杨毅[1] 沈钧康[1] 王灌忠[1] 张彩元[1] 钱铭辉[1] 

机构地区：[1]苏州大学附属第二医院MRI室,215004

出　　处：《临床放射学杂志》2010年第10期1331-1335,共5页Journal of Clinical Radiology

摘　　要：目的比较呼吸导航三维平衡超快场回波(3D balanced turbo field echo,3DBTFE)与双反转快速自旋回波(TSE)冠状动脉磁共振血管成像(CMRA)方面有无差异。资料与方法对28例分别利用呼吸导航3DBTFE和双反转TSE序列进行CMRA。在图像后处理[最大密度投影(MIP)、最小密度投影(MinIP)]后,对图像进行半定量评价(0～4级),并对评分≥2者进行统计学分析;采用标准的冠状动脉分段方式评价两种不同方法目标血管显示的成功率;对两种不同方法图像信噪比(SNR)、对比噪声比(CNR)和图像质量的评分进行比较。结果评分≥2者25例。(1)利用VCG触发和呼吸导航技术能较好地抑制心跳和呼吸运动伪影;(2)两种方法可以显示绝大部分目标节段,二者在右冠状动脉(RCA)近中段、左主干(LM)、左前降支(LAD)近中段、左回旋支(LCX)近中段显示率接近,RCA远段的显示率分别为75%和54%;(3)两种方法的RCA、LM、LAD和LCX的显示长度分别为97.38/89.14、15.34/14.19、52.50/35.41和50.92/49.16mm;(4)两种方法SNR、CNR和质量评分分别为108.86/4.66、67.77/28.01和3.50/2.54;(5)两种方法的单次扫描时间分别为1min45s和2min40s。结论 (1)两种方法的冠状动脉主干的显示率较高(RCA和LCX远段相对较低);(2)两种方法对患者的配合要求不高,均可在自由呼吸的情况下得到冠状动脉影像;(3)双反转TSE序列在冠状动脉目标节段的显示率上与3DBTFE序列接近,但是,其图像质量较后者差,稳定性不佳,在成像时间上也没有优势;(4)3DBTFE序列在冠状动脉目标节段的显示率、图像质量以及成像时间方面具有优势。Objective To prospectively compare the image quality and feasibility between 3D BTFE and dual-IR TSE sequence. Materials and Methods Twenty-eight cases received both the navigator-gated 3D BTFE and dual-IR TSE sequences. Postprocess reconstruction ways included maximum and minimum intensity projection. Statistical analysis was performed in image quality score≥2. Signal-to-noise ratio（SNR）,contrast-to-noise ratio（CNR）,scores of image quality and length of targed vessel were assessed among two sequences.Data were analyzed for statistical differences by using the matched-pairs student T test. Results （1） Artifacts could be reduced by VCG trigger combined with real-time respiratory navigator gating and tracking; （2） Targed vessels were clearly depicted by both the navigator-gated 3D BTFE and dual-IR TSE sequences; （3） Lengths of RCA,LM,LAD,LCX of 3D BTFE and dual-IR TSE sequence were 97.38/89.14,15.34/14.19、52.50/35.41 and 50.92/49.16 mm respectively,SNR,CNR and scores of image quality were 108.86/4.66,67.77/28.01 and 3.50/2.54 respectively. Conclusion VCG trigger combined with real-time respiratory navigator gating and tracking can obtain the image of coronary artery reliably. CMRA with 3D BTFE is more feasible and the image quality is better.

关 键 词：冠状动脉 磁共振血管成像 

分 类 号：R445.2[医药卫生—影像医学与核医学]