Accelerating anatomical 2D turbo spin echo imaging of the ankle using compressed sensing

To assess the feasibility and diagnostic value of compressed sensing for accelerating two-dimensional turbo spin echo imaging of the ankle. Ankles of 20 volunteers were scanned (mean age 30.2 ± 7.3 years, 13 men) at 3 T MRI. Coronal and sagittal intermediate-weighted (IM) sequences with fat saturati...

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Bibliographic Details
Published in:European journal of radiology 2019-09, Vol.118, p.277-284
Main Authors: Gersing, Alexandra S., Bodden, Jannis, Neumann, Jan, Diefenbach, Maximillian N., Kronthaler, Sophia, Pfeiffer, Daniela, Knebel, Carolin, Baum, Thomas, Schwaiger, Benedikt J., Hock, Andreas, Rummeny, Ernst J., Woertler, Klaus, Karampinos, Dimitrios C.
Format: Article
Language:English
Subjects:
Accelerated data acquisition
Adult
Ankle Joint - anatomy & histology
Bone and Bones - anatomy & histology
Cartilage - anatomy & histology
Diagnostic imaging
Echo-Planar Imaging - methods
Feasibility Studies
Female
Healthy Volunteers
Humans
Ligaments, Articular - anatomy & histology
Magnetic resonance imaging
Male
Musculoskeletal system
Observer Variation
Signal-To-Noise Ratio
Sparse sampling
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Summary:To assess the feasibility and diagnostic value of compressed sensing for accelerating two-dimensional turbo spin echo imaging of the ankle. Ankles of 20 volunteers were scanned (mean age 30.2 ± 7.3 years, 13 men) at 3 T MRI. Coronal and sagittal intermediate-weighted (IM) sequences with fat saturation as well as axial T2- and coronal T1-weighted sequences were acquired using parallel imaging based on sensitivity encoding (SENSE) only as well as with a combination of compressed sensing (CS) and SENSE. Compressed sensing is a technique that acquires less data through k-space random undersampling and enables a reduction in total acquisition time by 20%. All images were reviewed by two radiologists, image quality was graded using a 5-point Likert scale and signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of different anatomical structures of the ankle were assessed and compared between sequences with SENSE only and with the combination of CS and SENSE using Wilcoxon signed-rank tests and Cohen’s kappa. There was a substantial to perfect agreement for the rating between the images acquired with SENSE only and with the combination of CS and SENSE when assessing cartilage, subchondral bone and ligaments (κ = 0.75 - 0.89). SNR was slightly higher for the combination of CS and SENSE sequences compared to the sequences acquired with SENSE only, yet this finding was not significant (P = 0.18-0.62). Moreover, CNR of cartilage/fluid, subchondral bone/cartilage, ligaments/fluid and ligaments/fat did not show significant differences between the sequences acquired with SENSE only and the combination of CS and SENSE (P > 0.05). The interreader agreement was substantial to excellent for both techniques (κ=0.75 - 0.89). Compressed sensing reduced the acquisition time of conventional MR imaging of the ankle by 20% without decreasing diagnostic image quality, SNR and CNR.
ISSN:0720-048X
1872-7727
DOI:10.1016/j.ejrad.2019.06.006