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RAD106 exam 3

QuestionAnswer
What is the 15 or 50 Rule? An increase of 15 {kVp} is equivalent to increasing mAs} by 50% (doubling it). A 10% change in kVp has a much greater effect on intensity than a 10% change in mAs.
What is the Inverse Square Law: X-ray quantity/exposure is inversely proportional to the square of the distance from the source. The Inverse Square Law has the same effect on X-ray intensity and X-ray exposure
What is the Density Maintenance Formula? To maintain constant exposure when the SID (Source-to-Image Distance) is changed, mAs must be changed by the square of the distance ratio ({mAs}/SID)2.
Beam Energy refers to the penetrability of the X-ray beam
Increasing kVp increases the energy of the X-ray beam
An X-ray beam that could pass through dense tissue would have high penetrability and quality
The main purpose of added filtration to reduce patient dose by absorbing low-energy X-rays
Increasing filter thickness reduces X-ray intensity
What is the Half Value Layer (HVL)? the quantitative measurement of beam energy (quality). It is lowered by a decrease in kVp
Coherent Scattering...? An interaction between low-energy X-rays and atoms that occurs without ionization.
Primarily caused by photoelectric absorption: Differential absorption
High kVp techniques...? reduce differential absorption (lowering image contrast)
Bone has...? the greatest mass density among common body tissues (air, fat, soft tissue)
Increases with increasing atomic number Z: K-Shell Binding Energy
The use of contrast agents increases the amount of...? Differential absorption, photoelectric absorption, and Compton scatter.
Created by: evanlbates
 

 



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