UNIT 6 Chapter 8 X-Ray Emission & 9 Flashcards
the number of x-rays in the beam
X-ray quantity
the penetrability of the beam
X-ray quality
the intensity of the xray beam, the number of xrays in the beam
xray quanitity
another term used for intensity
radiation exposure
mAs=#=intensity=radiation exposure
radiation exposure, intensity or quality is measured in ___ in the air
milligray (mGya)
measures the number of ion pairs produced in the air
milligray in the air
factors that affect radiation exposure
mAs, kVp, distance, filtration
xray quantity is _________ to mAs
proportional
the main controlling factor is
mAs
when mAs is doubled, the quantity of xrays is____
doubled
Grays in air ar the measurement for x-ray_____
quantity, exposure or intensity
the number of xrays in the useful beam defines xray ______
quanitity
if filter thickness is ___ then xray intensity is___
If filter thickness is INCREASED, then xray intensity is DECREASED and if filter thickness is DECREASED then xray intensity is INCREASED
the inverse square law has the same affect on optical density and x-ray
The inverse square law has the same affect on x-ray intensity x-ray exposure x-ray quantity and optical density.
An increase of 15% in kVp is equivalent to increaseing mAs
An increase of 15% in K V P is equivalent to increase seen M A S 100%.
If the intensity of a 70kVp exposure at 20 mAs is 10 mGya what would it be at 5 mAs?
it would be 25 mGya at 5 mAs because exposure is proportional to mAs
If an exposure is 0.5 mGya at an SID of 40 inches, what would the exposure be at an SID of 60 inches?
it would be at 0.222 mGya at an SID of 60 inches because of the inverse square law.
The penetrability of an x-ray beam is called x-ray _____.
The penetrability of an x-ray beam is called x-ray quality.
An x-ray beam that could pass through dense tissue would have high _____.
An x-ray that could pass through thick tissue would have high quality and penetrability.
A compensating filter is used to create _____ optical density with a body part of _____ thickness.
A compensating filter is used to create uniform optical density with a body part of non-uniform thickness.
Five X-Ray Interactions with Matter
Coherent scattering Compton scattering Photoelectric effect Pair production Photodisintegration
Coherent Scattering can occur at energies below
10 KeV
AKA classical scattering or Thompson
scattering
Coherent Scattering
