Calcified Tissue International

, Volume 54, Issue 3, pp 212–218

Single X-ray absorptiometry of the forearm: Precision, correlation, and reference data

  • T. L. Kelly
  • G. Crane
  • D. T. Baran
Clinical Investigations

DOI: 10.1007/BF00301681

Cite this article as:
Kelly, T.L., Crane, G. & Baran, D.T. Calcif Tissue Int (1994) 54: 212. doi:10.1007/BF00301681

Abstract

The performance of a single X-ray absorptiometry (SXA) device incorporating an X-ray tube as a photon source was evaluated with respect to precision in vivo and in vitro, scan time, image quality, and correlation with an existing dual energy X-ray absorptiometry (DXA) device. SXA precision in vivo, expressed as a coefficient of variation (CV), was 0.66% for bone mineral content (BMC) and 1.05% for bone mineral density (BMD). Precision in vitro, based on 78 BMC measurements of a forearm phantom over 195 days, was 0.53%. Correlation with DXA at the 8 mm distal forearm site was high (r=0.97 for BMC and r=0.96 for BMD). A preliminary SXA reference database composed of 151 healthy Caucasian American women was developed to facilitate the interpretation of patient measurements. SXA scan time was 4 minutes and delivered a radiation exposure of 1.68 mrem. SXA image quality and spatial resolution were superior to SPA and comparable to DXA.

Key words

Single energy x-ray absorptiometry Dual energy x-ray absorptiometry Bone mineral density Bone mineral content 

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Copyright information

© Springer-Verlag New York Inc. 1994

Authors and Affiliations

  • T. L. Kelly
    • 1
  • G. Crane
    • 2
  • D. T. Baran
    • 2
  1. 1.Hologic, Inc.Waltham
  2. 2.Department of OrthopaedicsUniversity of Massachusetts Medical CenterWorcester

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