coefficientRadioactivityThe half-value thicknesses, linear and mass attenuation coefficients of biological samples such as bone, muscle, fat and water have been measured at 140, 364 and 662 keV γ -ray energies by using the ATOMLABTM-930 medical spectrometer. The γ -rays were obtained from ...
where Φ0(λ) is the incident radiant flux incident at a wavelength λ, μ(λ) is a wavelength-dependent attenuation coefficient which is the sum of absorption, k(λ), and scattering, ε(λ), coefficients: μ(λ) = k(λ) + ε(λ). Curve Jtr(λ) in Figure 6 shows the spectral ...
What is the attenuation coefficient of bone? The mass attenuation coefficient of bone with a density of 1.8 g/cm3, is0.2 cm2/gfor an 80-keV gamma ray. What is the attenuation coefficient of water? theoretical value of the mass attenuation coefficient of water at 59.54 keV isabout 47.0%for...
That is, the expected attenuation coefficient of air should be set to zero with small standard deviation only. For the hardware mean attenuation coefficient, we found that μ hardware=0.01 mm−1 is a good choice both for the headphones and for the RF coil. However, similar results were ...
The ultrasonic spectroscopy (broadband pulse) technique was applied to simultaneously measure phase velocity and attenuation coefficient of shear waves in a solid at frequencies ranging from 2.2 to 7.6 MHz. This technique is an extension of the ultrasonic spectropy technique currently used in determining...
We have observed the effect of the x-ray bandwidth on precise but relatively scaled measurements of the mass attenuation coefficient of molybdenum made on ... MD De Jonge,Z Barnea,CQ Tran,... - 《Physical Review A》 被引量: 29发表: 2004年 Two new experimental diffraction methods for a ...
In vitro measurement of the frequency-dependent attenuation in cancellous bone between 0.2 and 2 MHz Our goal was to evaluate the frequency dependence of the ultrasonic attenuation coefficient in cancellous bone. Estimates were obtained in immersion, using... Sana Chaffa,Frederic Padilla,Genevieve Berg...
Attenuation, scattering, and absorption of ultrasound in the skull bone PURPOSE: Measured values of ultrasound attenuation in bone represent a combination of different loss mechanisms. As a wave is transmitted from a fluid into... G Pinton,J Aubry,E Bossy,... - 《Medical Physics》 被引量: ...
Attenuation coefficientBackscatter coefficientBone volume fractionTrabecular thicknessThe present study aims to investigate the dependences of the attenuation and the backscatter coefficients on the frequency, the bone volume fraction (BV/TV) and the trabecular thickness (Tb.Th) in 16 trabecular-bone-...
Previous work has shown that ultrasonic waves propagating through cancellous bone often exhibit a linear-with-frequency attenuation coefficient, but a decr... CC Anderson,KR Marutyan,MR Holland,... - 《Journal of the Acoustical Society of America》 被引量: 81发表: 2008年 Waveform characteristics...