Division of Radiology, Geneva University Hospitals, Rue Gabrielle-Perret-Gentil 4, 1211, Geneva 14, Switzerland.
Division of Neuroradiology, Geneva University Hospitals , Geneva, Switzerland.
Eur Radiol. 2020 Jan;30(1):308-319. doi: 10.1007/s00330-019-06319-0. Epub 2019 Jul 1.
The aim was to evaluate the image quality and sensitivity to artifacts of compressed sensing (CS) acceleration technique, applied to 3D or breath-hold sequences in different clinical applications from brain to knee.
CS with an acceleration from 30 to 60% and conventional MRI sequences were performed in 10 different applications in 107 patients, leading to 120 comparisons. Readers were blinded to the technique for quantitative (contrast-to-noise ratio or functional measurements for cardiac cine) and qualitative (image quality, artifacts, diagnostic findings, and preference) image analyses.
No statistically significant difference in image quality or artifacts was found for each sequence except for the cardiac cine CS for one of both readers and for the wrist 3D proton density (PD)-weighted CS sequence which showed less motion artifacts due to the reduced acquisition time. The contrast-to-noise ratio was lower for the elbow CS sequence but not statistically different in all other applications. Diagnostic findings were similar between conventional and CS sequence for all the comparisons except for four cases where motion artifacts corrupted either the conventional or the CS sequence.
The evaluated CS sequences are ready to be used in clinical daily practice except for the elbow application which requires a lower acceleration. The CS factor should be tuned for each organ and sequence to obtain good image quality. It leads to 30% to 60% acceleration in the applications evaluated in this study which has a significant impact on clinical workflow.
• Clinical implementation of compressed sensing (CS) reduced scan times of at least 30% with only minor penalty in image quality and no change in diagnostic findings. • The CS acceleration factor has to be tuned separately for each organ and sequence to guarantee similar image quality than conventional acquisition. • At least 30% and up to 60% acceleration is feasible in specific sequences in clinical routine.
评估压缩感知（CS）加速技术在从脑部到膝盖的不同临床应用中的 3D 或屏气序列中的图像质量和对伪影的敏感性。
在 107 名患者的 10 种不同应用中进行了 CS 加速（30%至 60%）和常规 MRI 序列的检查，共进行了 120 次比较。读者对技术进行了定量（心脏电影的对比噪声比或功能测量）和定性（图像质量、伪影、诊断结果和偏好）的图像分析。
除了一位读者的心脏电影 CS 序列和腕部 3D 质子密度（PD）加权 CS 序列的运动伪影减少（由于采集时间缩短）外，对于每种序列，图像质量或伪影均无统计学差异。肘部 CS 序列的对比噪声比较低，但在所有其他应用中均无统计学差异。除了四个病例中由于运动伪影使常规或 CS 序列的图像质量受到干扰外，所有比较中常规和 CS 序列的诊断结果均相似。
除了肘部应用需要较低的加速外，评估的 CS 序列已经可以在临床日常实践中使用。对于每个器官和序列，CS 因子应进行调整以获得良好的图像质量。在本研究中评估的应用中，加速率为 30%至 60%，对临床工作流程有重大影响。
• 压缩感知（CS）的临床应用将扫描时间减少了至少 30%，而图像质量仅略有下降，诊断结果无变化。
• CS 加速因子必须针对每个器官和序列分别进行调整，以保证与常规采集相似的图像质量。
• 在临床常规中，特定序列中至少可以实现 30%至 60%的加速。
