Ch. 5 Flashcards
What does mA control?
Filament current
What does kVp control?
KVP level
What is time selection?
Length of exposure
What does the rotor switch control?
Speed of rotating anode
What does the exposure switch control?
Moment of exposure
Where is the kVp selection?
Autotransformer
Between incoming line & exposure switch
Where is the mA selection?
Variable resistor (In filament circuit between incoming line & step down transformer)
Where is the time selection?
Timer circuit (Between exposure switch & step-up transformer)
Where is the rotor switch?
Stator
Desperate circuit from stator of anode motor
Where is the exposure switch?
Switch
Between auto transformer & timer circuit
rms voltage=
rms voltage= 70.7% peak kVp
What is diagnostic use?
Determines the source or cause of a disease
What is Therapeutic use?
Treats & rehabilitates a disease
Radiation therapy
What must the radiographic table be?
Radiolucent (carbon graphite fiber)
How is tube support locked in place?
“Detents” locked in place by a solenoid
U.S. Electricity is supplied by
60 Hz AC
Nominal rms voltage 200v-240v
Single-phase allows what?
Allows potential difference to drop to 0
What type of power is usually used for X-rays?
3-phase power
Why is 3-phase better than single-phase?
3-phase has less ripple, produces better & more consistent x-rays
Single-phase power has?
100% ripple
Voltage varies
3-phase has?
14% ripple
Voltage never falls below 86
3-phase, 12 pulse has?
4% ripple
Voltage never falls below 96
High-frequency power has?
1% ripple
Voltage never falls below 99
3-phase generator formula?
VxA=W
