Chapter 5 Test Flashcards
Variations for kvp accuracy should be within _____________%
a.) 5
b.) 1
c.) 10
d.) 2
a.) 5
In regards to an AEC system, the _____________ receives the current signal sent by the sensor and terminates the exposure.
a.) element
b.) backup timer
c.) detector
d.) comparator
d.) comparator
Which type of generator uses multiple sources of alternating current so that the voltage never drops to zero?
a.) three phase
b.) high frequency
c.) failing load
d.) single phase
a.) three phase
Central ray (CR) congruency is also known as:
a.) beam bucky tray alignment
b.) light field radiation field congruence
c.) linearity
d.) detent alignment
a.) beam bucky tray alignment
Radiation output should be reproducible to within:
a.) 5%
b.) 1%
c.) 10%
d.) 3%
a.) 5%
Selecting different mA and time settings to result in the same mAs is called:
a.) reciprocity
b.) linearity
c.) reproducibility
d.) accuracy
a.) reciprocity
If the kvp stated on the console matches the actual xray energy, this is called:
a.) reciprocity
b.) accuracy
c.) linearity
d.) reproducibility
b.) accuracy
The minimum filtration required for general purpose radiography and fluoroscopy is:
a.) 2.5 mm AL
b.) 2.0 mm AL
c.) 2.3 mm AL
d.) 3.5 mm AL
a.) 2.5 mm AL
Any variations between the stated kilovolt (peak) on the control panel and the measured kilovolt (peak) must be ___________%
a.) 5
b.) 20
c.) 10
d.) 2
a.) 5
Regarding linearity:
80 kvp and 10 mas is used for the first exposure and produces 50 mR of radiation output.
80 kvp and 20 mas is used for the second exposure what will the radiation output be for the second exposure?
a.) 25 mr
b.) 100 mr
c.) 200 mr
d.) 150 mr
b.) 100 mr
A high frequency generator can use current thats been altered to as much as ________ Hz before being rectified.
a.) 60
b.) 100,000
c.) 60,000
d.) 120
b.) 100,000
When the SID is 80 cm the actual SID should match the displayed SID within a range of:
a.) 8.0 cm
b.) 1.6 cm
c.) 2.0cm
d.) 0.8 cm
b.) 1.6cm
The xray beam and bucky tray must be aligned within _________% of the SID
a.) 5
b.) 10
c.) 2
d.) 1
d.) 1
The tube angulation indicator must be accurate to within ____________ degress.
a.) 5
b.) 1
c.) 10
d.) 2
a.) 5
Variations for mAs accuracy should be within ____________%
a.) 2
b.) 10
c.) 1
d.) 5
b.) 10
Xray system reciprocity has an acceptance parameter of
a.) 10%
b.) 5%
c.) 20%
d.) 15%
a.) 10%
When the SID is 72 inches, the central ray (CR) alignment should be within what distance of the indicated field center?
a.) 1.44 inches
b.) 0.72
c.) 0.44 inches
d.) 0.3 inches
b.) 0,72
What is the primary disadvantage of using a single phase, full wave rectified generator for xray production?
a.) low velocity xray beam
b.) high velocity xray beam
c.) highly penetrating xray beam
d.) low penetrating x ray beam
d.) low penetrating xray beam
Creating the same intensity of radiation each time a set of technical factors are used to create an exposure is:
Reproducibility
Beam quanitity is:
radiation output
Using the same mAs, but with different combinations of mA and time is:
Reciprocity
Sequential increases in mAs produces the same sequential increase in the exposure measured is:
Linearity
The area of the anode bombarded by projectile electrons is:
focal spot
Accuracy of collimated area is
Light field congruence
A 3 phase 12 pulse generator will produce how many pulses in one second?
a.) 1/1000
b.) 1/120
c.) 360
d.) 720
d.) 720
An x-ray generator that is used on the battlefield is called a:
a.) portable
b.) mobile
a.) portable
The SID indicator must be within ________ % of the actual SID.
a.) 10
b.) 2
c.) 5
d.) 1
b.) 2
What are the two main components of an AEC system?
a.) comparator
b.) grid
c.) stator
d.) detectors
a.) comparator
d.) detectors
Which type of generator would be used on the battlefield?
a.) mobile
b.) portable
b.) portable
A quality control program for radiographic equipment should include which of the following:
1.) visual inspection
2.) enviromental inspection, and or
3.) performance testing
a.) 2 and 3 only
b.) 1, 2 and 3
c.) 1 and 3 only
d.) 1 and 2 only
b.) 1, 2 and 3
If the actual SID doesn’t match the SID set by the technologists, what two things can occur?
a.) image distortion
b.) excessive density
c.) increased patient dose
d.) excessive contrast
a.) image distortion
c.) increased patient dose
The variability for timer accuracy for exposure times greater than 10 ms is _____________%
a.) 5
b.) 10
c.) 2
d.) 20
a.) 5
The term “phase” refers to the:
a.) the number of distinct wave cycles in a circuit
b.) number of wave cycles per second
c.) direction of current flow
d.) amplitude of waves
a.) the number of distinct wave cycles in a circuit
The eight penny test is used to determine accuracy of:
a.) focal spot size
b.) collimation
c.) spatial resolution
d.) SID accuracy
b.) collimation
Which of the following are considered AEC detectors? choose all that apply.
a.) photodetectors (phototimers)
b.) solid state detectors
c.) comparitors
d.) ion chambers
a.) photodetectors (phototimers)
b.) solid state detectors
d.) ion chambers
Which of the following can be used to measure effective focal spot size?
a.) ion chambers
b.) densiometer
c.) solid state detector
d.) pinhole camera
d.) pinhole camera
Two common quality control tests that should be performed on grids are grid ____________ and grid _______________tests.
a.) alignment, uniformity
b.) ratio, frequency
c.) ratio, alignment
d.) uniformity, ratio
a.) alignment, uniformity
A 3 phase 6 pulse generator will produce how many pulses in one second?
a.) 720
b.) 1/60
c.) 360
d.) 1/120
c.) 360
Which x ray generator creates a waveform in which the voltage fluctuates from the maximum voltage to zero volts with every pulse?
a.) three phase, unrectified
b.) high frequency
c.) three phase, six pulse
d.) single phase, full wave rectified
d.) single phase, full wave rectified
Voltage ripple for a three phase six pulse generator is:
a.) 1-15%
b.) 13%
c.) 3.5%
d.) 100%
b.) 13%
What will likely happen if blooming has occured?
a.) image distal will be degraded
b.) the anode will fail to rotate
c.) contrast and density will be altered
d.) pitting of the anode will result
a.) image distal will be degraded
An exposure is made using 115 kvp and 30 mas which results in a total mr of 1.88. A second exposure is made using the same kvp and mas and results in 1.82 mr. This describes:
a.) reproducibility
b.) reciprocity
c.) linearity
d.) kvp accuracy
a.) reproducibility
Electrical current in the US Is ___________ HZ.
a.) 60
b.) 220
c.) 100
d.) 120
a.) 60
Three phase generators use how many sources of current?
a.) 5
b.) 2
c.) 1
d.) 3
d.) 3
If mas is increased in increments then the radiation output should increase in the same sequential change. This is called:
a.) reciprocity
b.) linearity
c.) reproducibility
d.) accuracy
b.) linearity
HVL is best used to measure:
a.) filtration
b.) focal spot size
c.) linearity
d.) reproducibility of exposure
a.) filtration
Consistency of AEC exposure should include which of the following: choose all that apply
a.) varying part thickness
b.) varying ma
c.) varying field sizes
d.) varying kvp
a.) varying part thickness
b.) varying ma
c.) varying field sizes
d.) varying kvp
The technoligist is testing to see if the light field automatically collimates correctly to the size of the IR. They are testing the _____________.
a.) light field radiation field congruence
b.) bucky tray alignment
c.) PBL systems
d.) illuminator bulb brightness
c.) PBL system
Which performance test uses a spinning top?
a.) mas (beam quanitity)
b.) kvp accuracy
c.) linearity
d.) timer accuracy
d.) timer accuracy
An exposure is made in january at 70 kvp and 10 mas and produces a radiation output of 50 mr. The same exposure factors are used again in july and the same output of 50 mr is expected. This is called:
a.) reciprocity
b.) linearity
c.) accuracy
d.) reproducibility
d.) reproducibility
The backup timer should cut off at ______________ or _______________, whichever comes first.
600 mAs or 6 seconds
Voltage ripple for a three phase twelve pulse generator is:
a.) 100%
b.) 1-15%
c.) 3.5%
d.) 13%
c.) 3.5 %
The maximum variability allowed for the reproducibility of exposure is ________________%
a.) 5
b.) 10
c.) 2
d.) 20
a.) 5
The light field radiation field of a radiographic unit must be congruent to within ___________% of the SID
a.) 5
b.) 3
c.) 1
d.) 2
d.) 2
When the selected tube voltage is 80 kvp, the actual kvp must be accurate within a range of:
a.) 1.6 kvp
b.) 8.0 kvp
c.) 0.8 kvp
d.) 4.0 kvp
d.) 4.0 kvp
Voltage ripple for a high frequency generator is:
a.) 100 %
b.) 13%
c.) 1-15%
d.) 3.5 %
c.) 1-15%
The ________ ensures the light field of the collimator is the same area struck by xrays.
a.) focal spot test
b.) light field congruence
c.) beam alignment
d.) bucky tray alignment
b.) light field congruence
The ability of an xray imaging system to produce contrast radiation output at various combinations of mA and exposure time, resulting in the same mAs is called:
a.) linearity
b.) reproducibility
c.) uniformity
d.) reciprocity
d.) reciprocity
Focal spot size effects which part of the image?
a.) scatter
b.) spatial resolution
c.) contrast
d.) density
b.) spatial resolution
Beam quantity measures:
kvp
mas
timer accuracy
AEC
mAs
The control booth window may have obstructions as long as the tech has a clear view of the patient in the exam room.
a.) true
b.) false
b.) false
Radiographic kvp should be evaluated:
a.) monthly
b.) annually
c.) weekly
d.) semiannually
b.) annually
The variablility allowed for millampere and time linearity is ____________%
a.) 20
b.) 2
c.) 10
d.) 5
c.) 10
Contamination of a nuclear medicine department is detected using a:
a.) geiger muller
b.) proportional counter
c.) pocket dosimenter
d.) ion chamber
a.) geiger muller
An xray system with unreliable exposure reproducibility may resuly in which two adverse effects?
a.) improper receptor exposure
b.) increased distortion
c.) unacceptable spatial resolution
d.) unessesary patient exposure
a.) improper receptor exposure
d.) unessessary patietn exposure
If there is inaccuracy of the timer, what could result?
a.) increased patient dose
b.) image distortion
c.) excessive contrast
d.) insufficient density
a.) increased patient dose
Beam quantity should be with _____________
a.) 1%
b.) 2 %
c.) 10 %
d.) 50 %
c.) 10 %
Voltage ripple for a single phase generator?
a.) 13%
b.) 3.5 %
c.) 100%
d.) 1-15%
c.) 100%
The varibale aperture light localizing collimator must confine the xray beam to:
a.) 2% of the SID
b.) inside the light field
c.) outside the light field
d.) 5% of the SID
a.) 2% of the SID
Grid testing should include: choose all that apply
a.) grid uniformity
b.) grid alignment
c.) recuprocity
d.) linearity
a.) grid uniformity
b.) grid alignment
Collimation systems equipped with positve beam limitation must be accurate no more than a total of _______________%of the SID.
a.) 5
b.) 4
c.) 3
d.)2
b.) 4
A pinhole camera and stary pattern are test tools used for:
a.) kvp
b.) focal spot size
c.) mas
d.) exposure timer
b.) focal spot size
The kilovolts peak must be accurate to :
a.) 15
b.) 5
c.) 2
d.) 10
b.) 5
Which of the following devices for radiation measurement is the msot sensitive?
a.) ion chamber
b.) proportional counter
c.) geiger muller
d.) pinhole camera
c.) geiger muller
The xray tube output for identical technical paramets, should not vary by more than what percentage?
a.) 5%
b.) 2%
c.) 1%
d.) 10%
a.) 5 %
