Longitudinal precision of dual-energy X-ray absorptiometry in a multicenter study

Eric Orwoll, Shelia K. Oviatt, Adrian LeBlanc, Meryl Leboff, Robert Marcus, Susan Ott, Lionel Reese, Dick Drost, Harry Genant, Peter Stieger, David Sartoris, Richard Wasnich

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Reproducibility is a key issue in both clinical and research applications of bone mineral density (BMD) measurements. To examine the longitudinal precision of dual-energy x-ray absorptiometry (DEXA) for the measurement of mineral density in vivo and in vitro, the performance of a group of instruments in the course of a multicenter longitudinal clinical trial was monitored. Measures were performed on eight identical machines (Hologic QDR1000) and analyzed using the same automated software program. Short-term precision was good in vitro, [anthropomorphic spine phantoms; mean intrasite coefficient of variation (CV) 0.42 ± 0.1% (SD)] and in vivo (lumbar spine; CV 1.1 ± 0.5%). Intersite measures of a single spine phantom (specified mineral content -57.8 g) revealed a range of 57.3-58.4 g (CV 0.7%). In two subjects intersite CV in vivo were 3.7 and 2.1% (spine) and 1.8 and 3.2% (femoral neck). At five sites frequent phantom measures were performed over a 1 year period (mean number of measures 196) and revealed a mean all-point CV of 0.43% (range 0.35-0.53%). Longitudinal precision in vivo was somewhat less (mean CV of spinal measures 1.1%, femoral neck 1.2%, trochanter 1.3%, and Ward's area 2.4%). At one additional site large variations in phantom measures heralded repeated mechanical failures that eventually required machine replacement. In summary, DEXA demonstrates good in vitro and in vivo longitudinal precision, providing the basis for expanded clinical and research usefulness. Nevertheless, stringent quality assurance measures are required to detect and respond to system malfunctions.

Original languageEnglish (US)
Pages (from-to)191-197
Number of pages7
JournalJournal of Bone and Mineral Research
Volume6
Issue number2
StatePublished - Feb 1991

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Photon Absorptiometry
Multicenter Studies
Spine
Femur Neck
Minerals
X-Rays
Research
Bone Density
Femur
Software
Clinical Trials
In Vitro Techniques

ASJC Scopus subject areas

  • Surgery

Cite this

Orwoll, E., Oviatt, S. K., LeBlanc, A., Leboff, M., Marcus, R., Ott, S., ... Wasnich, R. (1991). Longitudinal precision of dual-energy X-ray absorptiometry in a multicenter study. Journal of Bone and Mineral Research, 6(2), 191-197.

Longitudinal precision of dual-energy X-ray absorptiometry in a multicenter study. / Orwoll, Eric; Oviatt, Shelia K.; LeBlanc, Adrian; Leboff, Meryl; Marcus, Robert; Ott, Susan; Reese, Lionel; Drost, Dick; Genant, Harry; Stieger, Peter; Sartoris, David; Wasnich, Richard.

In: Journal of Bone and Mineral Research, Vol. 6, No. 2, 02.1991, p. 191-197.

Research output: Contribution to journalArticle

Orwoll, E, Oviatt, SK, LeBlanc, A, Leboff, M, Marcus, R, Ott, S, Reese, L, Drost, D, Genant, H, Stieger, P, Sartoris, D & Wasnich, R 1991, 'Longitudinal precision of dual-energy X-ray absorptiometry in a multicenter study', Journal of Bone and Mineral Research, vol. 6, no. 2, pp. 191-197.
Orwoll, Eric ; Oviatt, Shelia K. ; LeBlanc, Adrian ; Leboff, Meryl ; Marcus, Robert ; Ott, Susan ; Reese, Lionel ; Drost, Dick ; Genant, Harry ; Stieger, Peter ; Sartoris, David ; Wasnich, Richard. / Longitudinal precision of dual-energy X-ray absorptiometry in a multicenter study. In: Journal of Bone and Mineral Research. 1991 ; Vol. 6, No. 2. pp. 191-197.
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AU - Ott, Susan

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