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Accelerated T1ρ acquisition for knee cartilage quantification using compressed sensing and data‐driven parallel imaging: A feasibility study
Author(s) -
Pandit Prachi,
Rivoire Julien,
King Kevin,
Li Xiaojuan
Publication year - 2016
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.25702
Subject(s) - data acquisition , imaging phantom , compressed sensing , knee cartilage , computer science , osteoarthritis , scanner , biomedical engineering , knee joint , sampling (signal processing) , nuclear medicine , artificial intelligence , computer vision , articular cartilage , medicine , pathology , surgery , alternative medicine , filter (signal processing) , operating system
Purpose Quantitative T1ρ imaging is beneficial for early detection for osteoarthritis but has seen limited clinical use due to long scan times. In this study, we evaluated the feasibility of accelerated T1ρ mapping for knee cartilage quantification using a combination of compressed sensing (CS) and data‐driven parallel imaging (ARC‐Autocalibrating Reconstruction for Cartesian sampling). Methods A sequential combination of ARC and CS, both during data acquisition and reconstruction, was used to accelerate the acquisition of T1ρ maps. Phantom, ex vivo (porcine knee), and in vivo (human knee) imaging was performed on a GE 3T MR750 scanner. T1ρ quantification after CS‐accelerated acquisition was compared with non CS‐accelerated acquisition for various cartilage compartments. Results Accelerating image acquisition using CS did not introduce major deviations in quantification. The coefficient of variation for the root mean squared error increased with increasing acceleration, but for in vivo measurements, it stayed under 5% for a net acceleration factor up to 2, where the acquisition was 25% faster than the reference (only ARC). Conclusion To the best of our knowledge, this is the first implementation of CS for in vivo T1ρ quantification. These early results show that this technique holds great promise in making quantitative imaging techniques more accessible for clinical applications. Magn Reson Med 75:1256–1261, 2016. © 2015 Wiley Periodicals, Inc.