Summary
Results from Dual Photon Absorptiometry, a common tool in the assessment of bone mass, vary as a function of source life, increasing by as much as 0.6% per month. This rate of increase may vary with source, and its cause is not clear. However, this long-term “drift” must be considered a significant problem for longitudinal studies and regular standardization of DPA equipment, in addition to callibration to machine standards, may be required for stringent quality control.
References
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Subdivision of the New York State Dept. of health
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Lindsay, R., Fey, C. & Haboubi, A. Dual photon absorptimetric measurements of bone mineral density increase with source life. Calcif Tissue Int 41, 293–294 (1987). https://doi.org/10.1007/BF02555232
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DOI: https://doi.org/10.1007/BF02555232