Accelerating knee MR imaging: Compressed sensing in isotropic three-dimensional fast spin-echo sequence

Publication date: February 2018
Source:Magnetic Resonance Imaging, Volume 46
Author(s): Seung Hyun Lee, Young Han Lee, Jin-Suck Suh
PurposeTo compare image quality between compressed sensing (CS)-3D-fast spin-echo (FSE) and conventional 3D-FSE sequences for knee magnetic resonance imaging (MRI).MethodsKnee MRI of 43 patients (male:female, 14:29; mean age, 53years) were acquired using conventional and CS-3D-FSE with an acceleration factor of 1.5. Overall image quality was assessed by correlation coefficient, root-mean-square error (RMSE), and structural similarity (SSIM) index. Regional image quality was evaluated using signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs). Subjective image quality was evaluated using a four-point scale. Diagnostic agreement for meniscal lesions between the two sequences was evaluated.ResultsThe scan time was reduced from 7:14–8:08 to 4:53–5:08 with CS. A strong positive correlation was observed between data of the two sequences (mean r=0.880). The RMSE (mean, 126.861) and SSIM index (mean, 0.987) were acceptable. The SNRs and CNRs were not significantly different between the two sequences (P>0.05, each). There were no significant differences in the evaluation of the menisci and cruciate ligaments, while the CS images demonstrated inferior quality of cartilage–subchondral bone delineation. Diagnostic agreement for meniscal lesions between the two sequences was very good (κ=0.943–1).ConclusionCompressed sensing-3D-FSE knee MRI produces images of acceptable quality while reducing scan time.



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