Single X-ray absorptiometry: Performance characteristics and comparison with single photon absorptiometry
Autor: | B. J. Riis, J. Borg, A. Møllgaard |
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Rok vydání: | 1995 |
Předmět: |
Adult
Male musculoskeletal diseases Bone density Endocrinology Diabetes and Metabolism Coefficient of variation Ulna Absorptiometry Photon Forearm Bone Density Humans Medicine Femur Densitometer Aged Aged 80 and over Bone mineral Phantoms Imaging business.industry Middle Aged Radius medicine.anatomical_structure Single photon absorptiometry Female business Nuclear medicine Densitometry |
Zdroj: | Osteoporosis International. 5:377-381 |
ISSN: | 1433-2965 0937-941X |
Popis: | The aim of the present study was to evaluate a new device for measurement of forearm bone mass using the technique of single X-ray absorptiometry (SXA, DTX-100; Osteometer A/S, Rødovre, Denmark), and to compare the performance with the more traditional single photon absorptiometry (SPA, DT 100; Osteometer A/S, Rødovre, Denmark). The SPA phantom measurements showed a coefficient of variation of 0.43% and 0.42% for bone mineral content (BMC) and bone mineral density (BMD), respectively (39 months including seven source changes). The SXA precision errors were slightly lower with values of 0.30% and 0.30%, respectively. The patient measurements showed SPA coefficients of variation of 0.85% and 0.99% (BMC and BMD) and SXA coefficients of variation of 0.56% and 0.83%, respectively. The correlation between SPA and SXA values performed in 377 individuals yielded r values of 0.99 and 0.98 for BMC and BMD, respectively. The correlations between SXA measurements of the dominant and non-dominant forearm yielded an r-value of 0.95, with a slope of 0.949 (p0.001) and an intercept of 0.204 (p0.05). The non-dominant forearm thus had approximately 3% lower BMC than the dominant (the same was true for BMD). Correlations to spine and femur ranged from r = 0.48 to r = 0.75. In conclusion, the new single X-ray absorptiometry forearm bone densitometer described in this paper has performance characteristics which allows it to be used both for diagnostic purposes and for the follow-up of treatment. |
Databáze: | OpenAIRE |
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