attenuation coefficient

(redirected from attenuation rate)
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attenuation coefficient

in radiography or ultrasound, the difference between the energy that enters a body part and the energy that is not detected. The difference is caused by the absorption and scattering of energy within the body tissues.

attenuation coefficient

A measure of the attenuation of energy waves or particles caused by absorption of energy as they pass through a particular medium (e.g., air, tissue, lead).

attenuation coefficient

The calculated remainder of the x-ray beam that is received by the detectors in a computed tomography (CT) unit. This value is used to determine the CT (Hounsfield) number.
See also: coefficient
References in periodicals archive ?
The duct attenuation rate ([alpha]) was determined from the insertion loss.
However, a general near field attenuation rate for an unknown radiator does not exist, and thus direct determination of DUT EIRP cannot be guaranteed .
The key driver: the geophysical differences of coal, air, and water with respect to EM wave propagation attenuation rates, RIM can be used to identify whether or not an old room is filled with air or water.
55 meters, exactly where the lowest attenuation rate in the light spectrum is found.
It is also observed that the attenuation rate and the harmonic suppression of the meandered-shaped resonator are superior to the other ones.
Craig, "Semi-empirical model for millimeter-wave vegetation attenuation rates," Elects.
Similar to the principles found in seismic systems, the RIM-IV's use of magnetic dipole antennas (transmission and receiver) give users the ability to survey changes in attenuation rates and phase shifts, enabling mine owners and managers to make better informed decisions on overall mine integrity and ensure continuous coal production without costly shutdown scenarios.