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Physics Unit 4 Exam

Chapters 8/9/10

QuestionAnswer
heated filament emits electrons by ________ thermionic emission
electrons are accelerated by a _____ voltage high
when high speed electrons hit the metal target, this produces...... x-rays
What are the 2 factors that affect heat production? tube current and kVp
adjusted for variations in patient thickness or density and creates a more uniform exposure to the IR compensating filters
Beam Quantity number of photons in the x-ray beam
Quantity is a direct relationship between the ____ that patients receive radiation dose
What changes by the square of the ratio of the change in kVp? beam quantity
If we increase our SID, the quantity reaching the IR ______ decreases
Filtration absorbs low energy ____ photons
the penetrability of the x-ray beam, how well the x-ray beam can transmit through the body to the IR beam quality
What is the primary factor of beam quality? Second? kVp, filtration
The measurement for beam quality Half Value Layer (HVL)
What is the normal HVL of diagnostic beams? 3 to 5 mm Al
What does the primary beam do? Exits the collimator and exposes the patient
What does the remnant beam do? remains after interaction with the patient; exits the patient to expose the IR
x-ray QUANTITY = x-ray _________ intensity
x-ray QUALITY = beam _________ penetrability
What 2 things affect HVL? kVp and filtration
Roentgens are the measurement for x-ray exposure, quantity
If the distance from source to image (SID) is reduced by half, how is the x-ray intensity at the image affected? It is increased by 4 times
An increase of 15% in kVp is equivalent to increasing mAs ___ 100%
beam quality is affected by filtration and kVp
Created by: user-2058008
 

 



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