Results 171 to 180 of about 10,977 (233)
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Photon absorptiometry of hydrocarbons
International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 1986Abstract 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
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Photon absorptiometry of bone and bone standards
The International Journal of Applied Radiation and Isotopes, 1985Abstract 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.
C.S. Chong, A.M. Ghose, D.A. Bradley
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OSTEOPOROSIS IN HYPERTHYROIDISM ESTIMATED BY PHOTON ABSORPTIOMETRY
Acta Endocrinologica, 1979ABSTRACT 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.
Th. Friis, J. Linde
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Dual-energy X-ray absorptiometry versus single photon absorptiometry of the radius [PDF]
Calcified Tissue International, 1991 Radial diaphyseal bone mineral density (BMD) was measured at the standard one-third site by dual-energy X-ray absorptiometry (DEXA) and by 125I single photon absorptiometry (SPA) in 70 consecutive subjects, aged 12-86 years, with metabolic disorders of the skeleton. Each patient was measured once by the DEXA (Hologic QDR-1000) instrument and four times
Katheryn D. New +2 more
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Dual-photon absorptiometry of the proximal tibia
Archives of Orthopaedic and Traumatic Surgery, 1987Dual-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).
C Hasling +3 more
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Dual photon absorptiometry of the proximal tibia
Calcified Tissue International, 1989Bone mineral content (BMC) and bone mineral density (BMD) of the proximal tibia were determined by dual photon absorptiometry on 44 women, aged 23-87 years. The area of the tibia measured was a 2.01 cm region immediately distal to the medial and lateral tuberosities.
Everett L. Smith +2 more
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Single X-ray absorptiometry: Performance characteristics and comparison with single photon absorptiometry [PDF]
Osteoporosis International, 1995 The aim of the present study was to evaluate a new device for measurement of forearm bone mass using the technique of single X-ray absorptiometry (SXA, DTX-100; Osteometer A/S, Rødovre, Denmark), and to compare the performance with the more traditional single photon absorptiometry (SPA, DT 100; Osteometer A/S, Rødovre, Denmark).
A. Møllgaard, B. J. Riis, J. Borg
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The reproducibility of single photon absorptiometry in a clinical setting
European Journal of Nuclear Medicine, 1989The reproducibility of single photon absorptiometry (SPA) results for detection of changes in bone mineral content (BMC) was evaluated in a clinical setting. During a period of 18 months with 4 different sources, the calibration scans of an aluminium standard had a variation of less than 1% unless the activity of the 125I source was low.
Ernest K. J. Pauwels +4 more
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Single-Photon Absorptiometry [PDF]
, 1988 Single-photon absorptiometry (SPA) was first described by Cameron and Sorenson (1963) in an effort to overcome the problems inherent in the use of film densitometry. The basic configuration for the single-photon systems commercially available today was introduced in 1972 (Mazess and Cameron, 1972).
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Sensitivity of dual-photon absorptiometry in spinal osteoporosis
Calcified Tissue International, 1988Lumbar spine bone mass and density were measured with Dual photon absorptiometry (DPA) in 60 patients with crush fractures and 60 age-matched normal women. Short-term reproducibility of bone mineral density (BMD) was 1.3% in normal women and 2.5% in osteoporotic women; long-term reproducibility in normal women was 2.2%.
Florence Trémollières +5 more
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