Results 71 to 80 of about 8,000 (135)

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

Dual photon absorptiometry of the proximal tibia

Calcified Tissue International, 1989
Bone 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.
M M, Checovich, B J, Kiratli, E L, Smith
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

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-energy X-ray absorptiometry versus single photon absorptiometry of the radius

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
R S, Weinstein, K D, New, L J, Sappington   +2 more
openaire   +2 more sources

Sensitivity of dual-photon absorptiometry in spinal osteoporosis

Calcified Tissue International, 1988
Lumbar 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%.
J M, Pouilles, F, Tremollieres, J P, Louvet, B, Fournie, G, Morlock, C, Ribot   +5 more
openaire   +2 more sources

Dual Photon Absorptiometry The Importance of Clinical Correlation

Clinical Nuclear Medicine, 1988
Dual photon absorptiometry is a reliable method of assessing bone mineral density. However, distortions of bony architecture, which may not be evident from the low-resolution images provided, can complicate the evaluation and lead to misleading findings. A case is presented which describes the importance of clinical and radiographic correlation.
L K, Von Moll, B L, Shulkin
openaire   +2 more sources

The Use of Photon Absorptiometry in the Diagnosis of Renal Osteodystrophy

Radiology, 1973
By using a 125I collimated point source to measure bone mineral, 700 measurements were obtained from the cortical bone of the lower arm in 303 patients with renal failure representing every stage of the disease. Of these patients, 123 had received transplants.
H J, Griffiths, R E, Zimmerman, G, Bailey, R, Snider   +3 more
openaire   +2 more sources

The reproducibility of single photon absorptiometry in a clinical setting

European Journal of Nuclear Medicine, 1989
The 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.
R, Valkema, J A, Blokland, S E, Papapoulos, O L, Bijvoet, E K, Pauwels   +4 more
openaire   +2 more sources