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Linear combination filtering for T 2 ‐selective imaging of the knee
Author(s) -
Vidarsson Logi,
Gold Garry E.,
Hargreaves Brian,
Pauly John M.
Publication year - 2006
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.20878
Subject(s) - meniscus , filter (signal processing) , cartilage , biomedical engineering , knee cartilage , knee joint , materials science , articular cartilage , computer science , osteoarthritis , physics , computer vision , medicine , optics , anatomy , pathology , surgery , alternative medicine , incidence (geometry)
Recently a novel T 2 selective imaging method based on linear combination (LC) filtering was developed. By linearly combining images acquired with different echo times LC filtering is able to generate images showing only tissues with a preselected range of T 2 relaxation times. In this study the use of LC filtering in knee imaging was investigated. Three LC filters were designed: a short LC filter for imaging the knee meniscus, a medium LC filter for articular cartilage, and a long LC filter for synovial fluid. To verify the filter designs, eight phantoms with different T 2 relaxation times were imaged. In addition, in vivo images were acquired from four asymptomatic volunteers and a subject with cartilage damage. T 2 maps were also generated using the same source images. Signal‐to‐noise ratio (SNR) measurements were made of the meniscus, cartilage, and fluid regions on the three LC filtered images. The highest SNR was seen in the target tissue on each of the LC filtered images. LC filtering is a new method that can selectively image knee tissues based on their T 2 . Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.