Comparative Evaluation of the DPX and DPX-IQ Lunar Densitometer Systems Following Software Upgrade

Wong, Joseph C. H. and Griffiths, Matthew R. (2002) Comparative Evaluation of the DPX and DPX-IQ Lunar Densitometer Systems Following Software Upgrade. Journal of Clinical Densitometry, 5 2: 199-205. doi:10.1385/JCD:5:2:199


Author Wong, Joseph C. H.
Griffiths, Matthew R.
Title Comparative Evaluation of the DPX and DPX-IQ Lunar Densitometer Systems Following Software Upgrade
Journal name Journal of Clinical Densitometry   Check publisher's open access policy
ISSN 1094-6950
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1385/JCD:5:2:199
Open Access Status Not yet assessed
Volume 5
Issue 2
Start page 199
End page 205
Total pages 7
Place of publication New York
Publisher Elsevier
Language eng
Subject 110320 Radiology and Organ Imaging
Abstract Bone densitometry research departments perform system and software upgrades infrequently in order to maintain high precision. This study compares the results obtained on a Lunar densitometer with DPX, and DPX-IQ installed to achieve year 2000 compliance. The DPX-IQ provides an improved femur edge detection algorithm with an expanded reference database. Two hundred data files for each measurement site acquired on DPX were reanalyzed on DPX-IQ. There was no change to the bone mineral density (BMD), bone mineral content (BMC), T-scores or Z-scores for the L2–L4 spine, radius (ultradistal and 33%), and total body. There was a significant high correlation for the femoral neck BMD (r = 0.98; p < 0.05). The mean differences in BMD, BMC, T-scores, and Z-scores at the femoral neck and Ward's and trochanteric regions were not significant (p < 0.05). The limits of agreement within the 95% confidence interval for the femoral neck BMD using the Bland and Altman method was between –0.057 and 0.063 g/cm2. This order of magnitude magnifies the long-term precision error and alters the usual confidence limits for interpretation of true change in densitometry practice. Therefore, it is important for reanalysis of DPX data files with the DPX-IQ to be performed so that longitudinal changes in BMD can be accurately assessed
Keyword bone densitometry
upgrade
software
comparison
precision
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Health and Rehabilitation Sciences Publications
 
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