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An automated algorithm for the detection of cortical interruptions and its underlying loss of trabecular bone; A reproducibility study


Peters, M and de Jong, J and Scharmga, A and van Tubergen, A and Geusens, P and Loeffen, D and Weijers, R and Boyd, SK and Barnabe, C and Stok, KS and van Rietbergen, B and van den Bergh, J, An automated algorithm for the detection of cortical interruptions and its underlying loss of trabecular bone; A reproducibility study, BMC Medical Imaging, 18, (1) pp. 13. ISSN 1471-2342 (2018) [Refereed Article]


Copyright Statement

Copyright 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1186/s12880-018-0255-7


Background: We developed a semi-automated algorithm that detects cortical interruptions in finger joints using high-resolution peripheral quantitative computed tomography (HR-pQCT), and extended it with trabecular void volume measurement. In this study we tested the reproducibility of the algorithm using scan/re-scan data.

Methods: Second and third metacarpophalangeal joints of 21 subjects (mean age 49 (SD 11) years, 17 early rheumatoid arthritis and 4 undifferentiated arthritis, all diagnosed < 1 year ago) were imaged twice by HR-pQCT on the same day with repositioning between scans. The images were analyzed twice by one operator (OP1) and once by an additional operator (OP2), who independently corrected the bone contours when necessary. The number, surface and volume of interruptions per joint were obtained. Intra- and inter-operator reliability and intra-operator reproducibility were determined by intra-class correlation coefficients (ICC). Intra-operator reproducibility errors were determined as the least significant change (LSCSD).

Results: Per joint, the mean number of interruptions was 3.1 (SD 3.6), mean interruption surface 4.2 (SD 7.2) mm2, and mean interruption volume 3.5 (SD 10.6) mm3 for OP1. Intra- and inter-operator reliability was excellent for the cortical interruption parameters (ICC ≥0.91), except good for the inter-operator reliability of the interruption surface (ICC = 0.70). The LSCSD per joint was 4.2 for the number of interruptions, 5.8 mm2 for interruption surface, and 3.2 mm3 for interruption volume.

Conclusions: The algorithm was highly reproducible in the detection of cortical interruptions and their volume. Based on the LSC findings, the potential value of this algorithm for monitoring structural damage in the joints in early arthritis patients needs to be tested in clinical studies.

Item Details

Item Type:Refereed Article
Keywords:bone micro-architecture, cortical interruptions, high resolution peripheral quantitative computed tomography, image processing, precision, rheumatoid arthritis
Research Division:Engineering
Research Group:Biomedical engineering
Research Field:Biomechanical engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Stok, KS (Dr Kathryn Stok)
ID Code:133623
Year Published:2018
Web of Science® Times Cited:11
Deposited By:Menzies Institute for Medical Research
Deposited On:2019-07-04
Last Modified:2019-08-05
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