Results 261 to 270 of about 76,780 (308)

Enhanced precision with dual-energy x-ray absorptiometry

Calcified Tissue International, 1992
Repeat spine and femur measurements (5 per case) were done on 19 subjects with the DPX-L densitometer operating at 3 mA giving a radiation flux fourfold higher than the earlier DPX model. The precision for spine bone mineral density (BMD) was about 0.55% (L2-L4) and 0.48% (L1-L4) for 2-minute scans (2.4 mrem). The precision was only slightly lower (0.4-
R, Mazess, C H, Chesnut, M, McClung, H, Genant   +3 more
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Technical principles of dual energy X-ray absorptiometry

Seminars in Nuclear Medicine, 1997
Since its introduction nearly ten years ago, dual-energy x-ray absorptiometry (DXA) has become the single most widely used technique for performing bone densitometry studies. One reason for its popularity is the ability of DXA systems to measure bone mineral density (BMD) in the spine and proximal femur, the two most common sites for osteoporotic ...
Blake, G M, Fogelman, I
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Simulation studies of dual‐energy x‐ray absorptiometry

Medical Physics, 1989
Computer simulations were performed to predict the performance characteristics of dual‐energy x‐ray absorptiometry. K‐edge filter techniques were analyzed in detail and compared to 153Gd sources in terms of output intensity, precision, patient dose, image contrast, beam hardening, and marrow fat effects.
J A, Sorenson, P R, Duke, S W, Smith
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The Use of Dual-Energy X-ray Absorptiometry in Animals

Investigative Radiology, 1996
The use of dual-energy absorptiometry (DXA) to measure bone mineral content (BMC) and bone mineral density (BMD) is widespread in humans and has been adapted to animals because of the need to examine bone and body composition in longitudinal studies.
S J, Grier, A S, Turner, M R, Alvis
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Dual-Energy X-Ray Absorptiometry

2007
Early attempts at bone densitometry used conventional x-rays with a step wedge made from an aluminum or ivory phantom included in the field of view as a means of calibration. The bone density was calculated by a visual comparison of the density of the bone and the known densities of the each of the steps on the phantom.
Nicola J. Crabtree, Mary B. Leonard, Babette S. Zemel   +2 more
openaire   +1 more source

Clinical reproducibility of dual energy X‐ray absorptiometry

Journal of Orthopaedic Research, 1995
AbstractDual energy x‐ray absorptiometry is a technique advocated for the measurement of bone mass throughout the skeleton, and recently it has been used to measure changes in periprosthetic bone mass after joint replacement. The accuracy and precision of the method in clinical patient populations have not been firmly established.
P, Williams-Russo, J H, Healey, T P, Szatrowski, R, Schneider, S, Paget, K, Ales, P, Schwartzberg   +6 more
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[Dual energy X-ray absorptiometry].

Nihon rinsho. Japanese journal of clinical medicine, 1994
Dual energy X-ray absorptiometry (DXA) has been widely used in Japan. In this article, we described our lateral measurement of lumbar vertebral body, and reviewed the fracture threshold and the diagnosis of osteoporosis. The bone mineral density was measured in the anteroposterior projection (L2-4BMD) and in the lateral projection (L3 latBMD) by XR-26.
S, Ichimura, T, Nakagawa
openaire   +1 more source

Indications and Reporting for Dual-Energy X-Ray Absorptiometry

Journal of Clinical Densitometry, 2004
Although dual-energy X-ray absorptiometry (DXA) is widely used to measure bone mineral density (BMD), there are few guidelines regarding indications for testing in populations other than postmenopausal women or for reporting the results from DXA studies. At the 2003 Position Development Conference of the International Society for Clinical Densitometry,
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The clinical role of dual energy X-ray absorptiometry

European Journal of Radiology, 2009
Dual energy X-ray absorptiometry (DXA) measurements of hip and spine bone mineral density (BMD) have an important role in the evaluation of individuals at risk of osteoporosis, and in helping clinicians advise patients about the appropriate use of anti-fracture treatment.
Blake, GM, Folgelman, I
openaire   +3 more sources

Dual-energy X-ray absorptiometry of the calcaneus: Comparison with vertebral dual-energy X-ray absorptiometry and quantitative computed tomography

Calcified Tissue International, 1995
The purpose of this study was to determine the efficacy of using bone mineral measurements of the calcaneus to evaluate osteoporosis. Dual energy X-ray absorptiometry (DXA) of the calcaneus was compared with posteroanterior lumbar absorptiometry (DXA) and vertebral quantitative computed tomography (QCT) measurements in 171 white women (78 normal and 93
A M, Laval-Jeantet, C, Bergot, M, Williams, K, Davidson, M, Laval-Jeantet   +4 more
openaire   +2 more sources