Improved Single Breath-Hold SSFSE Sequence for Liver MRI Based on Compressed Sensing: Evaluation of Image Quality Compared with Conventional T2-Weighted Sequences.

The purpose of this study was to evaluate the image quality of compressed-sensing accelerated single-shot fast spin-echo (SSFSE CS ) sequences acquired within a single breath-hold in comparison with conventional SSFSE (SSFSE CONV ) and multishot TSE (mTSE). A total of 101 patients who underwent liver MRI at 3 T, including SSFSE CONV (acquisition time (TA) = 58-62 s), mTSE (TA = 108 s), and SSFSE CS (TA = 18 s), were included in this retrospective study. Two radiologists assessed the three sequences with respect to artifacts, organ sharpness, small structure visibility, overall image quality, and conspicuity of main lesions of liver and pancreas using a five-point evaluation scale system. Descriptive statistics and the Wilcoxon signed-rank test were used for statistical analysis. SSFSE CS was significantly better than SSFSE CONV and mTSE for artifacts, small structure visibility, overall image quality, and conspicuity of main lesions ( p < 0.005). Regarding organ sharpness, mTSE and SSFSE CS did not significantly differ ( p = 0.554). Conspicuity of liver lesion did not significantly differ between SSFSE CONV and mTSE ( p = 0.404). SSFSE CS showed superior image quality compared with SSFSE CONV and mTSE despite a more than three-fold reduction in TA, suggesting a remarkable potential for saving time in liver imaging.