Fast isotropic volumetric magnetic resonance imaging of the ankle: Acceleration of the three-dimensional fast spin echo sequence using compressed sensing combined with parallel imaging. Issue 112 (March 2019)

• Record Type: Journal Article
• Authors: Yi, Jisook; Lee, Young Han; Hahn, Seok; Albakheet, Salman S.; Song, Ho-Taek; Suh, Jin-Suck
• Is Part Of: European journal of radiology. Issue 112(2019)
• Page Start: 52
• Page End: 58
• Publication Date: 2019-03
• Subjects: Compressed sensing -- MR -- Ankle; Medical radiology -- Periodicals; Radiology -- Periodicals; Radiologie médicale -- Périodiques; Medical radiology; Periodicals; 616.075705
• DOI: 10.1016/j.ejrad.2019.01.009
• Languages: English
• ISSNs: 0720-048X

Abstract

Highlights: Utilization of MRI for the ankle can be maximized by using the multiplanar imaging. Isovoxel 3D-fast spin echo sequence of ankle MRI has the capabilities of acquiring thin-sliced sections without any loss of spatial resolution. The CS technique is a method to accelerate MR acquisition by acquiring undersampling κ-space data. Compressed sensing accelerated isotropic 3D-FSE ankle MRI provides acceptable diagnostic performance with reduced scan time. Abstract: Objectives: To investigate the feasibility of three-dimensional fast spin echo (3D-FSE) imaging with compressed sensing (CS) and parallel imaging (PI) compared to 3D-FSE imaging with only PI in evaluating ankle joint pathologies. Materials and methods: Twenty consecutive patients underwent ankle magnetic resonance imaging (MRI), including acquisition of image sets of 2D-FSE sequences, and 3D-FSE sequences without and with CS, between June 2016 and November 2017. Three MR image sets were independently rated by two radiologists for the presence/absence of ankle pathology. Quantitative image similarity and subjective image quality were evaluated using 3D-FSE images without CS and those with CS-PI. Inter-sequence agreement between 3D-FSE sequences without CS and with CS-PI in both readers was evaluated. Results: Interobserver agreements were nearly perfect for sprain of the anterior talofibular ligament (ATFL, κ= 0.77), osteochondral lesion of the talus (OLT, κ= 0.76-0.88), osteochondral lesion of the distal tibia (OLTi, κ= 0.74) and os subfibulare (OSF, κ= 0.62-0.64). The structural similarity index (mean, 0.996; range, 0.990-0.997) between the 3D-FSE sequences without CS and with CS-PI was acceptable. There was no significant difference in subjective image quality between the two imaging sequences (ATFL, p = 0.317; bone marrow, p = 0.083; cartilage, p = 1.000, tendon, p = 1.000). Intersequence agreement between the 3D-FSE sequences with and without CS was nearly perfect (ATFL and OLTi, κ= 1.00; OLT, κ= 0.87-0.96; OSF, κ= 0.62-0.64) in both readers. Conclusions: Isotropic 3D-FSE ankle MRI with CS provides acceptable diagnostic performance with reduced scan time. Compressed sensing-related artifacts could be minimized with CS reconstruction enhancement, allowing for better image quality for evaluating ankle joint pathologies.