Comparison on quality between FSE T2WI and PROPELLER FSE T2WI for upper abdomen examination with 3.0T MRI

Abstract:

Objective：To evaluate the effectiveness of periodically rotated overlapping parallel lines with enhanced reconstruction（PROPELLER） technique in reducing motion artifact and improving image quality on FSE T2WI image. Methods：Ninety-seven patients with a mean age of 53.8 years（age range，19-76 years） were underwent upper abdominal examination with 3.0T MRI. The same scanning parameters were used on axial T2-weighted PRO－PELLER sequence and FSE sequence. The respiratory artifacts，gastrointestinal movement artifacts，pulsatility artifacts，overall image quality，and the edge of the liver，pancreas were evalu－ated by two radiologists using a 3-point scale. The Wilcoxon’s rank sum test was used for statistical analysis. The Cohen’s Kappa test was used to determine the agreement between two radiologists. Results：On T2-weighted PROPELLER images，the respiratory artifacts，gastrointestinal movement artifacts，vascular pulsatility artifact were reduced and the overall image quality，sharpness of the liver，pancreas and renal corticomedullary junction area were improved（Z=-5.931，-6.245，-6.481，-6.164，-5.745；P<0.05）. The agreement between two radiologists is consistent. Conclusions：Compared those of with FSE T2WI sequence，the respiratory artifacts，gastrointestinal movement artifacts，vascular pulsatility artifacts are significantly reduced on PROPELLER T2WI sequence. PROPELLER T2WI can better display the anatomic structure，improve the image quality and shorten the scanning time.