[An experimental study of quantitative bone mineral analysis using computed tomography with calibration phantom].

The fat tissue in the bone marrow distorts the values of the mineral density obtained by quantitative computed tomography (QCT), so the precise bone mineral density must be measured by modified QCT followed by corrected magnetic resonance imaging (MRI). The correlation between CT-value and trabecular distribution of the bone area in the undecalcified section of the vertebral body was reviewed. As a result, Ca-content corrected by MRI showed closer approximate value to Ca-content obtained by chemical analysis than to Ca-content obtained by QCT alone. Higher correlations were also obtained between bone area and bone mineral density corrected by MRI. Bone mineral density can be estimated from the QCT-value followed by corrected MRI. In trabecular distribution, bone area was greater at the posterior part of the vertebral body than at the anterior part.