Document Detail

A preliminary evaluation of the lunar expert-XL for bone densitometry and vertebral morphometry.
MedLine Citation:
PMID:  9240736     Owner:  NLM     Status:  MEDLINE    
We have evaluated the Lunar Expert-XL for standard bone mineral densitometry (BMD) and for morphometric imaging of the spine in the lateral projection. The short-term precision in vitro of the Expert-XL for BMD measurements was 0.7% for the Hologic and European spine phantoms, and the long-term stability (15-month) measurements had a 1.1% coefficient of variation. The precision in vivo for three operators examining a group of 10 premenopausal women was 0.9-1.5% for lumbar spine (L2-L4), 1.7-2.2% for the femoral neck, and 0.9% for the total hip region of interest. For a group of nine postmenopausal women, the lumbar spine, femoral neck, and total femur precision ranges were 2.0-2.4, 1.2-2.9, and 1.6-1.7% respectively. For L2-L4, BMD comparison between the Expert-XL and DPX-L yielded a correlation coefficient of r = 0.98, a slope of 0.86, and an intercept of 0.139 g/cm2. The femoral neck results were r = 0.92, slope = 1.00, and intercept = 0.03 g/cm2. In an evaluation of the Expert-XL for lateral morphometry, we employed a group of 16 postmenopausal women. Comparison of vertebral dimensions between the Expert-XL and radiographic morphometry showed strong agreement (r = 0.97), but the interobserver variability for vertebral height was higher for the Expert-XL than for radiographs (3-5% vs. 1-2%). In a subset of four women who had repeat scans, the interscan precision for measuring vertebral dimensions was 1.9, 4.1, and 43% for the L1-L4, T12-T8, and T7-T5 levels respectively. In the Expert-XL images, it was possible to identify clearly L4-T4 in 10 of 16 patients and L4-T6 in 15 of 16, indicating potential utility for vertebral fracture prescreening.
T Lang; M Takada; R Gee; C Wu; J Li; C Hayashi-Clark; S Schoen; V March; H K Genant
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research     Volume:  12     ISSN:  0884-0431     ISO Abbreviation:  J. Bone Miner. Res.     Publication Date:  1997 Jan 
Date Detail:
Created Date:  1997-09-08     Completed Date:  1997-09-08     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8610640     Medline TA:  J Bone Miner Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  136-43     Citation Subset:  IM; S    
Osteoporosis Research Group, Department of Radiology, University of California-San Francisco, 94143-1250, U.S.A.
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MeSH Terms
Absorptiometry, Photon / instrumentation,  methods*,  standards
Aged, 80 and over
Bone Density / physiology*
Expert Systems
Femur / physiology*,  radiography
Femur Neck / physiology*,  radiography
Lumbar Vertebrae / physiology*,  radiography
Middle Aged
Models, Theoretical
Observer Variation
Osteoporosis, Postmenopausal / diagnosis,  physiopathology*,  radiography
Phantoms, Imaging
Postmenopause / physiology
Reproducibility of Results

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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