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CT registry prep

Safety Review

TermDefinition
Attenutation reduction in intensity of a radiation beam as it passes thru a substance
Photoelectric Absorption occurs when energy of an incident(incoming) photon is completely abs thru ionization of an inner shell electron in the target atom.
Compton Scattering Incident xray photon interacts with outer shell electron. Results in a transfer of energy which ejects outer shell electron (ionization). Results in loss of energy for incident xray photon and a change in direction.
Overall amount of attenuation depends on... beam quality (photon energy) and anatomic density of tissue,
Focus to Isocenter Distance distance btwn tube and center of gantry
focus to detector distance distance btwn tube and detector array.
Cone shaped beam used in MDCT. All detectors in the array must be equally exposed.
Over beaming an expansion of the cone beam used in MDCT to avoid penumbra.
Overranging occurs when extra radiation is applied before and after a scan during volumetric acquisition to ensure enough data is collected for interpolation algorithms.
Bow Tie Filter used to filter along the periphery of a cone beam. Pt dose reduction technique, due to reduced radiation along the outer parts of the pt that are thinner than the midsection.
Detector Efficiency: Inherent Absorption Efficiency describes ability of each detector array to capture transmitted xray quanta and produce the appropriate response
Detector Efficiency: Geometric Efficiency spatial arrangements of detector elements. Includes amnt of interspace material btwn elements.
Created by: ashton.harward
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