Enhancing Image Quality of 3D View-Sharing Sequence Acquired Abdominal Free-Breathing 4D-MRI by Retrospective Motion Artifacts Suppression by Synthetic Radial K-Space (R-MASSK)
Y Wong1*, H Chang2, W Liu3, W Wang4, Y Zhang5, H Wu6, H Lee7, A Cheung8, T Li9, J Cai10, (1) The Hong Kong Polytechnic University, ,,(2) The University Of Hong Kong, ,,(3) ,,,(4) ,,,(5) Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital & Institute, Beijing, 11, CN, (6) Beijing Cancer Hospital, Beijing, ,CN, (7) The University Of Hong Kong, ,,(8) ,,,(9) The Hong Kong Polytechnic University, Hong Kong, ,HK, (10) Hong Kong Polytechnic University, Hong Kong, ,CN
Presentations
WE-C1000-IePD-F2-2 (Wednesday, 7/13/2022) 10:00 AM - 10:30 AM [Eastern Time (GMT-4)]
Exhibit Hall | Forum 2
Purpose: This study aims to propose a novel technique, Retrospective Motion Artifacts Suppression by Simulated radial K-space (R-MASSK), that can suppress motion artifacts and enhance image quality of clinically available 3D view-sharing 4D-MRI.
Methods: The R-MASSK technique was tested on clinically acquired 4D-MRI images of 20 liver cancer patients using 3D view-sharing sequences – TRICKS or TWIST, on a 1.5T or 3.0T scanners (10 patients for each scanner), respectively. The R-MASSK 4D-MRI, result-driven (RD) sorted 4D-MRI, RD sorted 4D-MRI followed by the sequential wavelet denoising (RD+D), and the original 4D-MRI were then quantitatively evaluated by signal-to-noise ratio (SNR), hepatic portal vein-to-liver parenchyma contrast-to-noise ratio (CNR), and gradient energy (GE) percentage decrease.
Results: The proposed R-MASSK technique shows significant improvement on motion artifacts and overall image quality in all three planes (coronal, sagittal, and axial), and all respiratory phases, as compared to the RD-sorted 4D-MRI and the original 4D-MRI. R-MASSK 4D-MRI shows higher SNR and CNR in all three planes as compared to the RD+D, RD, original 4D-MRI. For both cohorts of patients, the average magnitude of SNR (CNR) 22.7 ± 7.1 (16.6 ± 6.88), 15.0 ± 4.82 (10.82 ± 4.91), 14.4 ± 4.52 (10.4 ± 4.71), and 15.0 ± 4.8 (10.48 ± 4.91), respectively. The average magnitude of GE percentage decrease for R-MASSK 4D-MRI with respect to RD, RD+D, and original 4D-MRI are 29.6 % ± 12.4 %, 24.3 % ± 12.5 %, and 31.5 % ± 12.0 %, respectively.
Conclusion: Both qualitative and quantitative results suggest that R-MASSK technique is capable of suppressing motion artifacts and improving image quality in both axial, coronal, and sagittal planes of the 4D-MRI acquired by 3D view-sharing sequence.
Funding Support, Disclosures, and Conflict of Interest: This work is supported by funding from grants NIH R01 CA226899, GRF 15102118, HMRF 06173276
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