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Qualitative and quantitative ultrashort‐TE MRI of cortical bone
Author(s) -
Du Jiang,
Bydder Graeme M.
Publication year - 2013
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.2906
Subject(s) - cortical bone , bound water , magnetization transfer , bone matrix , osteoporosis , bone mineral , magnetic resonance imaging , biomedical engineering , matrix (chemical analysis) , materials science , radiology , chemistry , medicine , anatomy , pathology , cartilage , organic chemistry , molecule , composite material
Osteoporosis causes over 1.5 million fractures per year, costing about $15 billion annually in the USA. Current guidelines utilize bone mineral density (BMD) to assess fracture risk; however, BMD alone only accounts for 30–50% of fractures. The other two major components of bone, organic matrix and water, contribute significantly to bone mechanical properties, but cannot be assessed with conventional imaging techniques in spite of the fact that they make up about 57% of cortical bone by volume. Conventional clinical MRI usually detects signals from water in tissues without difficulty, but cannot detect the water bound to the organic matrix, or the free water in the microscopic pores of the Haversian and the lacunar‐canalicular system of cortical bone, because of their very short apparent transverse relaxation times ( T 2 *). In recent years, a new class of sequences, ultrashort‐TE (UTE) sequences, with nominal TEs of less than 100 µs, which are much shorter than the TEs available with conventional sequences, have received increasing interest. These sequences can detect water signals from within cortical bone and provide an opportunity to study disease of this tissue in a new way. This review summarizes the recent developments in qualitative UTE imaging (techniques and contrast mechanisms to produce bone images with high contrast) and quantitative UTE imaging (techniques to quantify the MR properties, including T 1 , T 2 * and the magnetization transfer ratio, and tissue properties, including bone perfusion, as well as total, bound and free water content) of cortical bone in vitro and in vivo . The limitations of the current techniques for clinical applications and future directions are also discussed. Copyright © 2012 John Wiley & Sons, Ltd.