Chapter 15 - Beam Restriction PowerPoint
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11 Terms
Beam restriction is another word for
collimation
What does beam restriction do?
Decreasing the field size, decreases the ESE by absorbing scatter radiation (decreases patient dose)
ESE
Entrance Skin Exposure
Most common type of collimator?
Variable Rectangular Collimator (manual)
What is PBL?
Positive Beam Limiter (automatic collimator)
#1 priority of beam restrictors?
less dose to patient
#2 priority of beam restrictors?
less scatter produced
The shutter on the collimator
is a device usually made of lead fixed to an x-ray tube housing to intercept the useful beam
What is the collimator used for?
to block any stray radiation which includes leakage & secondary radiation
Allowed leakage amount
1 mGy per hour at a distance of 1 meter from tube housing
Not collimating may result in
Increased scatter production
Increased patient dose
Note 
Flashcards (20)