Results 171 to 180 of about 549,458 (270)

Dual-photon Gd-153 absorptiometry of bone.

Radiology, 1985
Dual-photon absorptiometry with gadolinium 153 was used to measure the mineral content of lumbar vertebrae in cadavers, excised vertebrae with marrow, and dry, marrow-free vertebrae. The error introduced by the surrounding soft tissue of cadavers was 3%, and the error in determining mineral mass or density in excised vertebrae was about 5%.
H W, Wahner, W L, Dunn, R B, Mazess, M, Towsley, R, Lindsay, L, Markhard, D, Dempster   +6 more
openaire   +3 more sources

An evaluation of dual-energy X-ray absorptiometry and comparison with dual-photon absorptiometry

Osteoporosis International, 1992
Dual-photon absorptiometry (DPA) is a well-established procedure for measuring bone mineral density (BMD). Recently, dual-energy X-ray absorptiometry (DXA) has become available, which has the ability to measure BMD both regionally and in the total body (TB). We have evaluated the in vivo and in vitro precision of a DXA instrument and compared it with a
B, Lees, J C, Stevenson
openaire   +3 more sources

Vertebral and Peripheral Bone Mineral Content by Photon Absorptiometry

Investigative Radiology, 1977
Dual photon absorptiometry with 153Gd was used to determine the bone mineral content of the lumbar spine of 46 subjects. The bone mineral content of the radius and ulna were measured on these same subjects using single photon absorptiometry. The bone mineral content at the peripheral sites was not a very accurate indicator of absolute bone mineral ...
M. Madsen
openaire   +3 more sources

Precision of dual-photon absorptiometry

Calcified Tissue International, 1988
Precision of dual-photon absorptiometry (DPA) measurements was determined in a lumbar spine phantom and in humans. Approximately half of the measurements were made before and half after a 153gadolinium source change. The phantom was measured with different amounts of acrylic, which simulates human soft tissue, in order to evaluate the influence of body
C C, Shipp, P S, Berger, M S, Deehr, B, Dawson-Hughes   +3 more
openaire   +2 more sources

Photon absorptiometry of hydrocarbons

International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 1986
Abstract Measured and parametrised values of the attenuation coefficients of several hydrocarbons having a hydrogen-to-carbon weight ratio in the range from 0.05 to 0.16 and for photon energies 33, 75, 145, 279 and 662 keV are presented. The values are compared and possible trends and applications discussed.
D.A. Bradley, C.S. Chong, A.M. Ghose
openaire   +1 more source

Photon absorptiometry of bone and bone standards

The International Journal of Applied Radiation and Isotopes, 1985
Abstract Measured and parametrised values of the attenuation coefficients of bone and several bone standards are presented for the photon energies 33, 75, 145, 279 and 662 keV. The values are compared, inadequacies are highlighted and possible new formulations are discussed.
D A, Bradley, C S, Chong, A M, Ghose
openaire   +2 more sources

OSTEOPOROSIS IN HYPERTHYROIDISM ESTIMATED BY PHOTON ABSORPTIOMETRY

Acta Endocrinologica, 1979
ABSTRACT The degree of osteoporosis in hyperthyroidism before and during treatment with carbimazole was studied by photon absorption technique of the right forearm and calcaneus. In addition serum total calcium, serum ionized calcium, serum phosphorus and serum alkaline phosphatase were determined.
J, Linde, T, Friis
openaire   +2 more sources

Dual-photon absorptiometry of the proximal tibia

Archives of Orthopaedic and Traumatic Surgery, 1987
Dual-photon absorptiometric bone-mineral assay, penetration tests, and axial compression tests of the proximal tibial epiphyses were carried out in 18 human cadaver knees. The reproducibility of bone mineral assay was within +/- 12% (95% tolerance limits).
I, Hvid, C, Hasling, S L, Hansen, H H, Hansen   +3 more
openaire   +2 more sources