Relationship between cancellous bone induced magnetic field and ultrastructure in a rat ovariectomy model

Masaya Takahashi, Felix W. Wehrli, Scott N. Hwang, Suzanne L. Wehrli

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The site-dependent variations in trabecular bone morphology were studied in the rat tibia by magnitude and phase difference three-dimensional nuclear magnetic resonance microscopy and image processing, and the implications of ovariectomy were evaluated. Specimens excised from the proximal tibial metaphysis in ovariectomized (n = 7) and intact control (n = 4) rats were imaged at 9.4T with their anatomic axes parallel to the direction of the magnetic field. An echo-offset 3D rapid spin-echo excitation pulse sequence was used to generate phase difference maps, from which the standard deviation of the phase difference, σ(Δφ), was calculated. In addition, a fictitious rate constant, R2/', was calculated from the slope of the exponential portion of the Fourier transform of the phase difference histogram. Trabecular bone volume fraction was also determined in the same volume of interest. The results show strong correlations between bone volume fraction and both σ(Δφ) and R2/', suggesting that these parameters could be useful for nondestructive assessment of trabecular bone volume.

Original languageEnglish (US)
Pages (from-to)33-39
Number of pages7
JournalMagnetic Resonance Imaging
Volume18
Issue number1
DOIs
StatePublished - Jan 1 2000

Keywords

  • NMR microscopy
  • Osteoporosis
  • Ovariectomy
  • Phase map
  • Trabecular bone

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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