MR relaxometry of lumbar spine, hip, and calcaneus in healthy premenopausal women: relationship with dual energy X-ray absorptiometry and quantitative ultrasound.
Eur Radiol
; 10(8): 1215-21, 2000.
Article
em En
| MEDLINE
| ID: mdl-10939477
ABSTRACT
This study evaluates if the reversible transverse relaxation rate (R2') assessed in vivo by MR of lumbar vertebrae, hip, and calcaneus is correlated with dual energy X-ray absorptiometry (DXA) and to quantitative ultrasound (QUS) of the calcaneus. Fifteen healthy premenopausal women aged 23-47 years were studied by DXA, QUS, and MR relaxometry. The GESFIDE sequence was used to separate the FID rate (R2*) into its two components, the non-reversible transverse relaxation rate (R2) and the reversible transverse relaxation rate (R2'). Long-term reproducibility was obtained by repeated measurements of hip and calcaneus in nine individuals after 300+/-89 days. R2' and R2* of the calcaneus had a relationship to broad-band ultrasound attenuation (BUA; r = 0.46, both p<0.05), but not to other US or DXA parameters of the calcaneus. Both R2' and R2* were correlated with bone mineral per area (BMA) of the hip (r>0.73, p<0.001 and r>0.66, p<0.01, respectively). R2 was correlated with BMA(L1-L4) (r = 0.52, p<0.05). R2' and R2* were not correlated with BMA(L1-L4). When the right and left sides were compared in calcaneus and hip the correlation coefficient for R2' and R2* ranged from 0.76 to 0.86 (p<0.001). The long-term reproducibility expressed in coefficient of variation (CV%) was approximately 5 % for R2' and approximately 4% for R2*. Differences in R2 between individuals were not reproducible. The results of this study indicate that R2' and R2* measurements are reproducible and might be of value when evaluating bone quality of the hip and foot.
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Base de dados:
MEDLINE
Assunto principal:
Imageamento por Ressonância Magnética
/
Calcâneo
/
Absorciometria de Fóton
/
Densidade Óssea
/
Ultrassonografia
/
Articulação do Quadril
/
Vértebras Lombares
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
/
Female
/
Humans
/
Middle aged
Idioma:
En
Ano de publicação:
2000
Tipo de documento:
Article