Physics Unit 4 Flashcards
What is the appropriate voltage needed for x-ray machines in the United States
220
What type of generator system allows the potential difference to drop to zero
Single phase
Which phase generator operates at 360 pulses per second
Multi phase
Supplies the tube with properly modified power, boosts voltage, sets length of exposure, activates, rotor, contains the KVP selector, contains the step up transformer, contains the rectification circuit
Main circuit
Boost amperage, surprise, filament with properly modified power, contains the step down transformer
Filament circuit
Which of the following actions initiates the rotation of the anode/rotor?
First 1/2 of the depression of the exposure switch
Which type of exposure timer utilizes ion chambers?
Automatic timers
The typical volts applied to the filament circuit after the transformer is approximately____
6–12 V
What device has major and minor settings?
Auto transformers
The MA setting on the console signifies what setting
The anticipated MA needed at the filament
A 3-phase, 6 pulse generator has an approximate voltage ripple of_____ percent
13–25
A high frequency generator has an approximate voltage ripple of_____ percent
3–4
A 3 phase, 12 pulse generator has an approximate voltage ripple of_____ percent
4–10
What type of generator are typically equivalent to battery operated units?
3-phase, 12 pulse
What MA setting does the following word generator begin?
The highest MA possible for the exposure
Which of the following is not set by the technologist when using AEC
Timer
What setting is used to control detail?
mA
Where are the ion Chambers located?
Between the patient and the IR
The back up timer should be set at_____ of the anticipated manual exposure
150%
Tomographic images are typically obtained in the____ plane
Coronal
The_____ is the pivot point of the connection between the tube and the IR on a tomographic unit
Fulcrum
Which of the following has movement during the exposure on a tomo unit?
Tube and IR
Amplitude and thickness are_______ proportional
Indirectly
Which statement is true regarding recorded detail, while using a tomo unit
The wider, the arc, the better the detail
Zonography utilizes a_____
Small angle arc
How many chambers are in a typical radiographic, ion chamber configuration?
3
_____ is the total distance traveled by the tube during exposure phase of a tomo exposure?
Exposure angle
The distance from the table top to the fulcrum is known as the_____
Fulcrum level
_____ describes the total distance the tube travels when making an exposure
Tube shift
Where is the area of interest located when performing tomo exams?
Focal plane
What type of tomo unit allows the fulcrum to be changed while the patient is stationary
Adjustable fulcrum
What should be adjusted one more blurring is needed for the object of interest
Exposure angle
What is used to simulate tomo exposures?
Digital tomosynthesis
What exposure angle provides the best radiographic detail
90°
What happens to blur when the OID is increased?
Increases
What exposure factor should be set at first when performing a tomo exam?
Time
What type of mA station is set for tomogram?
As low as possible
Why is tomography not utilized much anymore?
Other modalities like CT and MRI can obtain better, more efficient images
