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WorksheetsRAD 121 Chapter 17, 18 & 20
Total questions: 10
Worksheet time: 5mins
For all x-ray machines that can operate above 70 kVp, the required minimum amount of total filtration for the x-ray tube is:
2.5 cm Pb equivalent
0.25 mm Pb
2.5 mm Al equivalent
2.5 mm Al
A wedge-shaped compensating filter would always be placed with the thinnest end:
toward the thickest anatomy
toward the thinnest anatomy
toward the patient’s head
toward the patient’s feet
Added filters are usually made of what material for diagnostic x-ray machines:
aluminum
copper
tungsten
molybdenum
Which of the following devices is most recommended for both protecting the patient and
improving subject contrast in the remnant beam as it reaches the image receptor:
increase kVp
increase mAs
extension of exposure time
collimator
Positive beam limitation (PBL) should be manually over-ridden when:
the PBL is inaccurate by ½ inch (or 1 cm)
the field light is burned out
the desired field size is smaller than the receptor plate size
the desired field size is larger than the receptor plate size
The proportion of scatter radiation present in the remnant x-ray beam is most directly and most dramatically determined by the:
amount of off-focus radiation produced
volume of tissue exposed to the primary beam
use of grids
kVp set
As the kVp increases the probability of Compton interactions
increase
decreases
remains about the same
Additional scatter radiation increases:
overall exposure at the receptor plate
desirable gray scale
umbra
penumbra
Scatter radiation affects:
primary beam geometry
image resolution
image distortion
occupational exposure
Which of the following is most likely to result in visible grid lines:
oscillating grid
stationary grid
reciprocating grid
focused grid
