Magnetic resonance elastography SE-EPI vs GRE sequences at 3T in a pediatric population with liver disease.

Abstract

The goal of our study is to compare hepatic stiffness measures using gradient-recalled echo (GRE) versus spin-echo echo planar imaging (SE-EPI)-based MR Elastography (MRE) at 3T used to measure hepatic stiffness in a patients with suspected liver diseases. This retrospective study included 52 patients with liver disease who underwent a 3T MRE exam including both an investigational SE-EPI-based technique and a product GRE-based technique. Regions of interest (ROI) were placed on the elastograms to measure elastography-derived liver stiffness as well as the area included within the ROIs. The mean liver stiffness values and area of ROIs were compared. The mean liver stiffness was 3.72 kilopascal (kPa) ± 1.29 using GRE MRE and 3.78kPa ± 1.13 using SE-EPI MRE. Measurement of liver stiffness showed excellent agreement between the two pulse sequences with a mean bias of - 0.1kPa (range - 1.8 to 1.7kPa) between sequences. The mean measurable ROI area was higher with SE-EPI (313.8cm2 ± 213.8) than with the GRE technique (208.6cm2 ± 114.8), and the difference was statistically significant (P < 0.05). Our data shows excellent agreement of measured liver stiffness between GRE and SE-EPI-based sequences at 3T. Our results show the advantage of a SE-EPI MRE sequence in terms of image quality, ROI size and acquisition time with equivalent liver stiffness measurements as compared to GRE-MRE sequence.