Abstract
Summary
Longitudinal studies of bone using high-resolution medical imaging may result in non-physiological measurements of longitudinal changes. In this study, we determined that three-dimensional image processing techniques best capture realistic longitudinal changes in bone density and should therefore be used with high-resolution imaging when studying bone changes over time.
Introduction
The purpose of this study was to determine which longitudinal analysis technique (no registration (NR), slice-match (SM) registration, or three-dimensional registration (3DR)) produced the most realistic longitudinal changes in a 3-year study of bone density and structure using high-resolution peripheral quantitative computed tomography (HR-pQCT).
Methods
We assessed HR-pQCT scans of the distal radius and tibia for men and women (N = 40) aged 55–70 years at baseline and 6, 12, 24, and 36 months. To evaluate which longitudinal analysis technique (NR, SM, or 3DR) best captured physiologically reasonable 3-year changes, we calculated the standard deviation of the absolute rate of change in each bone parameter. The data were compared between longitudinal analysis techniques using repeated measures ANOVA and post hoc analysis.
Results
As expected, both SM and 3DR better captured physiological longitudinal changes than NR. At the tibia, there were no differences between SM and 3DR; however, at the radius where precision was lower, 3DR produced better results for total bone mineral density.
Conclusions
At least SM or 3DR should be implemented in longitudinal studies using HR-pQCT. 3DR is preferable, particularly at the radius, to ensure that physiological changes in bone density are observed.
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Data availability
The data are not publicly available. Upon reasonable requests to the corresponding author, data may be shared.
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Acknowledgments
The authors thank J.M. Allan, J.A. Allan, S. Gaudet, M. Kan, and B. Love for participant recruitment and A. Cooke, S. Kwong, and D. Raymond for scan acquisition and analysis. The authors also thank the study participants for generously donating their time to support our research.
Funding
This study was funded by Pure North S’Energy Foundation in response to an investigator-initiated research proposal.
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The study was approved by the Conjoint Health Research Ethics Board at the University of Calgary and Health Canada. All participants gave written consent before participating in the study.
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TDK, CMJdB, LG, DAH, and LAB have nothing to declare. EOB has previously received honoraria from Amgen and Eli Lilly and a research grant from Amgen. SKB has received honorariums from Amgen and Servier and is co-owner of Numerics88 Solutions Inc.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Kemp, T., de Bakker, C., Gabel, L. et al. Longitudinal bone microarchitectural changes are best detected using image registration. Osteoporos Int 31, 1995–2005 (2020). https://doi.org/10.1007/s00198-020-05449-2
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DOI: https://doi.org/10.1007/s00198-020-05449-2