优化实时并行采集技术心脏电影序列在心律失常者心脏MRI中的初步应用

Preliminary application of optimized temporal parallel acquisition technique real-time cine sequence in cardiac MRI in arrhythmia patients

目的探讨优化实时并行采集技术(TPAT)心脏电影成像序列评价心律失常者心脏结构及功能的价值。方法对33例心律失常患者(心律失常组)和48例心律正常者(心律正常组)分别行传统心脏电影[平衡稳态自由进动(bSSFP)序列]和优化TPAT实时电影序列成像;比较两个序列测量两组左心室心肌厚度、心功能、心肌应变参数及图像质量的差异。结果心律失常组中,两个序列测得左心室12个心肌节段室壁厚度差异均有统计学意义(P均<0.05);心肌径向应变及圆周应变的峰值和平均值差异均有统计学意义(P<均0.05)。心律正常组中,两序列左心室各节段室壁厚度和应变指标差异均无统计学意义(P均>0.05)。两个序列所测两组心功能参数差异均无统计学意义(P均>0.05)。心律失常组中,优化TPAT序列的图像质量优于bSSFP序列(P<0.05)。结论优化TPAT序列可提高心律失常患者心脏MR电影图像质量。

Objective To observe the value of optimized temporal parallel acquisition technique （TPAT） sequence in evaluating cardiac structure and function in arrhythmia patients. Methods Totally 33 arrhythmia patients （arrhythmia group） and 48 normal rhythm subjects （normal group） underwent cardiac MRI with conventional cine （balanced steady-state free-precession[bSSFP]） sequence and optimized TPAT sequence. Myocardial thickness, cardiac function, myocardial strain parameters of left ventricle and image quality of 2 sequences were compared in the two groups, respectively. Results In arrhythmia group, there was statistical difference of myocardial thickness in 12 myocardial segments between the 2 sequences （all P〈0.05）, as well as peak and average values of myocardial radial and circumferential strain （all P〈0.05）. In normal group, there was no statistical difference of myocardial thickness and stain parameters between the 2 sequences （all P〉0.05）. Additionally, no statistical difference of cardiac function was found between the 2 sequences in two groups （all P〉0.05）. In arrhythmia group, the image quality of optimized TPAT sequence was better than that of bSSFP sequence （P 〈 0.05）. Conclusion For arrhythmia patients, optimized TPAT cine sequence could improve image quality of cardiac MRI.