Results 281 to 290 of about 3,275,520 (334)
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AJR. American journal of roentgenology, 2019
OBJECTIVE Recently, a new method was developed to diagnose hepatic steatosis by measuring attenuation coefficients that are based on the ultrasound-guided attenuation parameter (UGAP).
T. Tada +6 more
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OBJECTIVE Recently, a new method was developed to diagnose hepatic steatosis by measuring attenuation coefficients that are based on the ultrasound-guided attenuation parameter (UGAP).
T. Tada +6 more
semanticscholar +1 more source
Measurement science and technology, 2019
Accurate measurements of the ultrasonic shear wave attenuation coefficient are essential for the quantitative nondestructive evaluation of the microstructure of a material. This work provides an experimental technique for measuring this coefficient using
Guangdong Zhang +4 more
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Accurate measurements of the ultrasonic shear wave attenuation coefficient are essential for the quantitative nondestructive evaluation of the microstructure of a material. This work provides an experimental technique for measuring this coefficient using
Guangdong Zhang +4 more
semanticscholar +1 more source
Attenuation Coefficient Measurement in the Thyroid
Journal of Ultrasound in Medicine, 2003To assess the feasibility of a novel method of measuring the attenuation coefficient in the thyroid, which offers less variability of results than the conventional method.In our new method, the attenuation coefficient was evaluated on the basis of the following equation with sound field correction: alpha = -1/4[Fc(z)-epsilon(z)] x d/dz[log(M0(z))-tau(z)
Yasutomo, Fujii +3 more
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Light & Engineering, 2019
The article describes the estimation of measurement error of seawater beam attenuation coefficient using the Monte Carlo method. Measurements of the beam attenuation coefficient and its vertical distribution are the most common type of hydro-optical ...
V. Burenkov +3 more
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The article describes the estimation of measurement error of seawater beam attenuation coefficient using the Monte Carlo method. Measurements of the beam attenuation coefficient and its vertical distribution are the most common type of hydro-optical ...
V. Burenkov +3 more
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Mass-attenuation coefficients of beta particles
International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 1990Abstract A method to obtain mass-attenuation coefficients of β particles is described. This method is based upon the simulation of β emission by means of the β energy spectrum. The range of the β particle is chosen as random incidence by means of range distribution of monoenergetic electrons which have the same energy as the β particle.
CENGIZ, AHMET, OZMUTLU, C
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Radiochimica Acta, 2018
In this work, the structure properties and mass attenuation coefficient of MgO nanoparticles were studied before and after gamma irradiation. The as-synthesized samples of MgO nanoparticles by sol–gel method were analyzed by XRD which suggested the ...
M. Amini +3 more
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In this work, the structure properties and mass attenuation coefficient of MgO nanoparticles were studied before and after gamma irradiation. The as-synthesized samples of MgO nanoparticles by sol–gel method were analyzed by XRD which suggested the ...
M. Amini +3 more
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Relative Spectral Attenuation Coefficients of Water
Applied Optics, 1967The relative variation of attenuation coefficient with wavelength has been studied in the laboratory for distilled water and seawater. The study was for the purpose of locating any very fine structure in the attenuation vs wavelength curve. The spectral region from 3750 A to 6850 A was examined with 0.2 A resolution; water paths were 9.7 m and 19.5 m ...
L F, Drummeter, G L, Knestrick
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Attenuation Coefficient Estimation of Normal Placentas
Ultrasound in Medicine & Biology, 2019Attenuation coefficient estimation has the potential to be a useful tool for placental tissue characterization. A current challenge is the presence of inhomogeneities in biological tissue that result in a large variance in the attenuation coefficient estimate (ACE), restricting its clinical utility. In this work, we propose a new Attenuation Estimation
Farah Deeba +8 more
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Radiology, 2022
Nonalcoholic fatty liver disease (NAFLD) is the most common chronic liver disease worldwide, with an estimated prevalence of up to 30% in the general population and higher in people with type 2 diabetes.
G. Ferraioli +5 more
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Nonalcoholic fatty liver disease (NAFLD) is the most common chronic liver disease worldwide, with an estimated prevalence of up to 30% in the general population and higher in people with type 2 diabetes.
G. Ferraioli +5 more
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Gamma-Ray Attenuation-Coefficient Measurements
Physical Review A, 1970Total $\ensuremath{\gamma}$-ray attenuation coefficients have been measured at nine energies in the range of 88 keV to 2.75 MeV for the following elements: Be, C, Mg, Al, S, Ti, Fe, Ni, Cu, Zn, Zr, Nb, Mo, Ag, Sn, La, Gd, Hf, W, Au, Pb, Th, U, and Pu. Radioactive isotopes were used as sources of monoenergetic $\ensuremath{\gamma}$ radiation in a narrow-
A. L. Conner +3 more
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