Development of a compact MRI system for trabecular bone volume fraction measurements

A compact MRI system for measuring trabecular bone volume fraction (TBVF) of the calcaneus was developed with the use of a 0.21 T permanent magnet and portable MRI console. The entire system weighed < 600 kg and was installed in a 2 m × 2 m space. Two cross‐sectional spin‐echo images of a heel ac...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2004-08, Vol.52 (2), p.440-444
Main Authors: Kose, Katsumi, Matsuda, Yoshimasa, Kurimoto, Takeaki, Hashimoto, Seitarou, Yamazaki, Yukako, Haishi, Tomoyuki, Utsuzawa, Shin, Yoshioka, Hiroshi, Okada, Shigemasu, Aoki, Masaaki, Tsuzaki, Tsuyoshi
Format: Article
Language:English
Subjects:
Adolescent
Adult
Bone Density
calcaneus
Calcaneus - anatomy & histology
compact MRI
Equipment Design
Female
Humans
Magnetic Resonance Imaging - instrumentation
Middle Aged
permanent magnet
Phantoms, Imaging
Reproducibility of Results
trabecular bone
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Summary:A compact MRI system for measuring trabecular bone volume fraction (TBVF) of the calcaneus was developed with the use of a 0.21 T permanent magnet and portable MRI console. The entire system weighed < 600 kg and was installed in a 2 m × 2 m space. Two cross‐sectional spin‐echo images of a heel acquired with external reference phantoms (total measurement time = 5 min) were used to quantify the TBVF of the calcaneus. The linearity and reproducibility of the measurements were evaluated by means of proton density‐adjusted phantoms. Comparative measurements with quantitative ultrasound (QUS) in groups of healthy female volunteers showed a relatively high positive correlation (R2 = 0.4539, 0.2693) between TBVF and the speed of sound (SOS). These results demonstrate the potential of this new system for measuring bone density. Magn Reson Med 52:440–444, 2004. © 2004 Wiley‐Liss, Inc.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.20135