单次屏气及自由呼吸TSENSE技术对心功能测量及图像质量的评价

目的:评价TSENSE技术在不同加速因子及自由呼吸状态下测量心功能的准确性及图像质量.方法:15例患者真实稳态自由进动(trueFISP)全心短轴位电影检查.检查序列包括多次屏气trueFISP结合GRAPPA,不同加速因子(2～4)单次屏气TSENSE和自由呼吸TSENSE(R=3).测量并比较各种序列所测心脏射血分数(EF)、舒张末期容积(EDV)和收缩末期容积(ESV).结合乳头肌水平图像的对比噪声比(CNR)对各序列图像质量进行评价.结果:与GRAPPA相比,TSENSE各序列所测心功能指标差异无显著性意义(P＞0.05),两者结果具有一致性.各序列图像均具有诊断性,以GRAPPA和R=2时TSENSE图像质量最佳.结论:单次屏气和自由呼吸TSENSE技术全心扫描能准确评价左心室容积大小,以R=3时TSENSE序列最适合临床运用.

Single Breathhold and Free Breathing TSENSE Technique in the Evaluation of Cardiac Volumetry Image Quality

Objective:To assess the impact of TSENSE technique underwent various acceleration factors and free breathing in the accuracy of cardiac volumetric measurement and image quality.Methods:Fifteen patients underwent steady-state free precession (SSFP) cine MRI for short axis images of global heart scans.Pulse sequences used included true fast imaging with steady-state precession (trueFISP) combined with GRAPPA,true FISP with TSENSE of various acceleration factors ranged from R=2 to 4,single breathhold,and free breathing real time TSENSE (R=3).Volumetric assessment including ejection fraction (EF),end-diastolic volume (EDV) and end-systolic volume (ESV) was performed and measured in each sequence.Contrast-to-noise ratio (CNR) of the image at the position of papillary muscle was used to assess the imaging quality.Results:Compared with GRAPPA,no significant statistic difference of these TSENSE sequences in the measurement of EF,EDV and ESV was observed (P>0.05).Images of all pulse sequences could be used for diagnosis,among which,the quality of GRAPPA and TSENSE (R=2) were the best.Conclusion:A single breathhold or free breathing SSFP cine-MRI with TSENSE can precisely evaluate the cardiac volumetry.SSFP cine MRI with TSENSE (R=3) was the optimal technique for routine clinical application.