Interrelationships between 3T MRI derived cortical and trabecular bone structure parameters and quantitative computed tomography derived bone mineral density

摘要

Recently 3T magnetic resonance imaging (MRI) has been introduced for bone imaging. Through higher signal-to-noise ratios, as compared to 1.5 T MRI, it promises to be a more powerful tool for the assessment of cortical and trabecular bone measures. The goal of our study was to compare MRI derived cortical and trabecular bone measures to quantitative computed tomography (QCT) derived bone mineral density (BMD).Using 3T MRI in 51 postmenopausal women apparent (app.) measures of bone volume/total volume, trabecular number (Tb.N), trabecular thickness (Tb.Th) and trabecular separation were derived at the distal radius, distal tibia and calcaneus. Cortical thickness (Ct.Th) was calculated at the distal radius and distal tibia. These measures were compared to QCT derived BMD of the spine, hip and radius.Significant correlations (*p<0.05; **p<0.001; ***p<0.0001) were found between spine BMD and MRI derived Ct.Th (rradius=0.55*; rtibia=0.67***) and app. Tb.N (rradius=0.33*; rtibia=0.35*) at the radius and tibia. Furthermore within the first 10mm at the radius an inverse correlation for cort. thick and app. BV/TV (r6mm=−0.56, p<0.001; r10mm=−0.36, p<0.05) and app. Tb.Th (r6mm=− 0.54, p<0.001; r10mm=− 0.41, p<0.05) was found..