Article

Heel bone densitometry: device specific thresholds for the assessment of osteoporosis.

Regional Medical Physics Department, University Hospital of North Durham, North Road, Durham DH1 5TW, UK.
British Journal of Radiology (Impact Factor: 1.22). 07/2006; 79(942):464-7. DOI: 10.1259/bjr/47352663
Source: PubMed

ABSTRACT A diagnosis of osteoporosis is facilitated by bone mineral density (BMD) measurement of the lumbar spine and hip using dual energy X-ray absorptiometry (DXA), interpreted in accordance with criteria published by the World Health Organization (WHO). The use of peripheral DXA is growing in primary care and guidance on its use has recently been published by the National Osteoporosis Society (NOS), recommending a triage approach using thresholds specific to each type of peripheral device. However, no data currently exist for the Norland Apollo heel densitometer (Cooper Surgical, Trumbull, USA). 215 women between 50 years and 75 years of age (mean age 64.6 years) referred for hip and spine BMD measurements also had a heel BMD measurement. Device specific upper and lower thresholds were calculated for the Norland Apollo heel densitometer to give a 90% sensitivity and 90% specificity for osteoporosis at the hip or spine. Patients with a heel T-score of above -1.2 are very likely to have normal bone density on axial densitometry, whilst patients with heel T-score of below -2.2 are very likely to have osteoporosis at the hip or spine. Patients whose measurements lie between the thresholds should be referred for axial DXA.

0 Bookmarks
 · 
88 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: A new low-power, high-speed CMOS 1-bit full adder cell is presented. It is based on recent designs of XOR and XNOR gates, and pass-transistors, it has 16 transistors. This cell has been compared to two widely used efficient adder cells; the transmission function full adder cell (16 transistors), and the low power adder cell (14 transistors). The new cell has no short circuit power and lower dynamic power, because of less number and magnitude of circuit capacitances. It consumes up to 21% less power than the other two cells, while it is 12% to 20% faster. A comparative analysis (using Magic and Hspice) for 8-bit ripple-carry and carry-select adders shows that the adders based on the new cell can save up to 29% of power consumption
    Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on; 01/1998
  • [Show abstract] [Hide abstract]
    ABSTRACT: Although peripheral dual-energy X-ray absorptiometry measurements have been found to predict fractures in population studies of white subjects, little is known about their utility in other races and in patients with greater risk of fracture. In a cross-sectional study of 874 women referred for bone mineral density (BMD) testing, we examined the utility of heel BMD in African-American (AA) compared with Caucasian (CA) women and in women using glucocorticoids. The ability of heel T-score to predict central osteoporosis was similar in AA and CA women (odds ratio [OR] per 1 unit decrease in T-score of 2.79 [95% confidence interval {CI} 2.16-3.60] and 3.15 [95% CI 2.53-3.92], respectively). The association between heel T-score and prevalent vertebral fractures was also similar in the 2 groups (OR 1.46 [95% CI 1.15-1.85] in AA and 1.42 [95% CI 1.16-1.74] in CA). In women using glucocorticoids heel T-score was better than central T-score in predicting vertebral fractures (OR 1.38 [95% CI 1.03-1.85] and 1.22 [95% CI 0.86-1.73], respectively). We conclude that in a multiracial referral population heel BMD predicts central osteoporosis and prevalent vertebral fractures equally well in AA as in CA women and may be better than central BMD in assessing fragility in glucocorticoid users.
    Journal of Clinical Densitometry 10/2013; · 1.71 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Peripheral assessment of bone density using photon absorptiometry techniques has been available for over 40 yr. The initial use of radio-isotopes as the photon source has been replaced by the use of X-ray technology. A wide variety of models of single- or dual-energy X-ray measurement tools have been made available for purchase, although not all are still commercially available. The Official Positions of the International Society for Clinical Densitometry (ISCD) have been developed following a systematic review of the literature by an ISCD task force and a subsequent Position Development Conference. These cover the technological diversity among peripheral dual-energy X-ray absorptiometry (pDXA) devices; define whether pDXA can be used for fracture risk assessment and/or to diagnose osteoporosis; examine whether pDXA can be used to initiate treatment and/or monitor treatment; provide recommendations for pDXA reporting; and review quality assurance and quality control necessary for effective use of pDXA.
    Journal of Clinical Densitometry 01/2008; 11(1):188-206. · 1.71 Impact Factor

Full-text (2 Sources)

View
26 Downloads
Available from
Jun 4, 2014