Results 221 to 230 of about 55,053 (254)

Measurement of mass attenuation coefficients in air by application of detector linearity tests

Physical Review A, 2002
Accurate knowledge of x-ray mass attenuation coefficients is essential for studies as diverse as atomic physics, materials science, and radiation safety. However, a significant discrepancy exists between theoretical tabulated results for air at soft x-ray energies.
A. G. Peele, C. T. Chantler, D. Paterson, P. J. McMahon, T. H. K. Irving, J. J. A. Lin, K. A. Nugent, A. N. Brunton, I. McNulty   +8 more
openaire   +1 more source

The linear attenuation coefficients as features of multiple energy CT image classification

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2000
Abstract We present in this paper an analysis of the linear attenuation coefficients as useful features of single and multiple energy CT images with the use of statistical pattern classification tools. We analyzed four CT images through two pointwise classifiers (the first classifier is based on the maximum-likelihood criterion and the second ...
M.R.P Homem, N.D.A Mascarenhas, P.E Cruvinel   +2 more
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A DC-4GHz High Linearity Attenuator with Negative Temperature Coefficient

2021 IEEE International Conference on Integrated Circuits, Technologies and Applications (ICTA), 2021
Yangyang Zhou, Hao Zhang 0111, Chuanchuan Wan, Tian Zhang   +3 more
openaire   +1 more source

Improvements in the two media method for measurements of gamma-ray linear attenuation coefficients

Applied Radiation and Isotopes, 2003
The two media method has been previously presented as a solution to the problem of measuring gamma-ray attenuation coefficients of odd-shaped samples. We propose that air is chosen as one of the two media. We theoretically demonstrate that this choice simplifies the equation used, as well as the laboratory work, and also reduces some of the terms ...
openaire   +2 more sources

Derivation of linear attenuation coefficients from CT numbers for low-energy photons

Physics in Medicine and Biology, 1999
One can estimate photon attenuation properties from the CT number. In a standard method one assumes that the linear attenuation coefficient is proportional to electron density and ignores its nonlinear dependence on atomic number. When the photon energy is lower than about 50 keV, such as for brachytherapy applications, however, photoelectric ...
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Energy resolution for accurate measurements of the X-ray linear attenuation coefficient

Radiation Physics and Chemistry, 2006
Abstract At energies below 100 keV, measurements of the X-ray linear attenuation coefficient μ , require either a mono-energetic source or a detector with good energy resolution. The majority of X-ray sources contain a spread of energies whilst detectors have finite energy resolution.
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Increase in linear attenuation coefficient by changing crystal structure of materials for radiation shielding and biomedical devices safety

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2021
Muhammad Maqbool, Muhammad Maqbool
exaly  

Linear Attenuation Coefficients for Phantom Materials Simulating Soft Tissue

Acta Radiologica. Diagnosis, 1973
A, Hemmingsson, B, Jung
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A Mineral X-ray Linear Attenuation Coefficient Tool (MXLAC) to Assess Mineralogical Differentiation for X-ray Computed Tomography Scanning

Minerals (Basel, Switzerland), 2020
Megan Becker, Jodie Miller, Lunga Bam
exaly  

A Method for Calculating Linear Attenuation Coefficients for Combinations of Fat and Muscle

Radiology, 1983
openaire   +2 more sources