5/24 Rad Test Flashcards
Number of x-rays traveling from the x-ray tube to the film.
Quantity (mA)
What is responsible for accelerating the electrons from the cathode to the anode?
kVp
What radiographic setting determines the quality of the x-ray beam and its ability to penetrate tissue?
kVp
The higher the kVp, the;
Faster electron acceleration, shorter wavelength of x-ray, more penetration, higher percentage of x-rays reach the film, lowers the mAs.
If the kVp is high, the mA is?
Low
What is the energy related to motion called?
Kinetic energy
What is the formula for Sante’s rule?
2 X thickness (cm) + 40 = kVp
What device is used to measure the thickness of an anatomic part, measured in cm?
Caliper
What occurs with thermionic emission and where does it occur?
Boiling off of electrons from filament from cathode.
What is the measure of the electron current to the filament which determines how many x-rays are produced?
mA
How is the mAs calculated?
mA X time(seconds) = mAs
Period of time x-rays are permitted to leave the tube?
Exposure time
What is the most common radiographic artifact in veterinary medicine?
Motion “Murphy’s Law”
What are the 4 advantages of having a high mA setting?
Shorter exposure times, decrease motion artifacts, allows examination of thicker anatomical areas, decreased exposure to personnel.
SID?
Source Image Distance
FFD?
Focal Film Distance
FFD is always kept at what distance?
40 inches
What is the Inverse Square Law?
The intensity of radiation varies inversely as the square of the distance from the source.
X-rays follow the rules of?
Light
Measurable distance between two adjacent densities.
Contrast
Varying degree of blackness.
Density
What is the formula for calculating new mAs with a new SID?
Old mAs X (new SID)^2 divided by Old SID^2 =new mAs
Quality of beam is determined by?
Penetrating power (kVp)
Quantity of the beam is determined by?
Number of x-rays traveling from the tube toward film over a given period of time. (mA)
