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Knee cartilage MRI with in situ mechanical loading using prospective motion correction
Author(s) -
Lange Thomas,
Maclaren Julian,
Herbst Michael,
LovellSmith Cris,
Izadpanah Kaywan,
Zaitsev Maxim
Publication year - 2014
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.24679
Subject(s) - knee joint , osteoarthritis , cartilage , biomedical engineering , biomechanics , patella , tracking (education) , materials science , medicine , anatomy , surgery , pathology , pedagogy , alternative medicine , psychology
Purpose To assess the feasibility of high resolution knee cartilage MRI with in situ mechanical loading using optical tracking to compensate for motion. Methods In vivo cartilage MRI with in situ mechanical loading is demonstrated on a clinical 3T system for the patellofemoral as well as for the tibiofemoral knee joint using a T 1 ‐weighted spoiled three‐dimensional gradient‐echo sequence. Prospective motion correction is performed with a moiré phase tracking system consisting of an in‐bore camera and a single tracking marker attached to the skin. Results Rigid‐body approximation required for prospective correction with optical motion tracking is fulfilled well enough for the patellofemoral as well as for the tibiofemoral joint when the tracking marker is attached to the knee cap and the shin, respectively. Presaturation proves to be efficient in suppressing pulsation artifacts from the popliteal artery and residual motion artifacts primarily arising from nonrigid motion of the posterior knee compartment. Conclusion The proposed technique enables knee cartilage imaging under in situ mechanical loading with submillimeter spatial resolution devoid of significant motion artifacts and thus appropriate for cartilage volumetry. It has the potential to provide new insight into the biomechanics of the knee and might complement the panoply of diagnostic MR methods for osteoarthritis. Magn Reson Med 71:516–523, 2014. © 2013 Wiley Periodicals, Inc.