Q5 Flashcards
Angle of anode
•7-18* degrees
Effective/Apparent focal spot
- perpendicular to long axis of tube •smaller then the actual focal spot
- the beam projected onto the patient
|< (diode)
- | cathode negative side
* < anode positive side
Bias Forward flow
•Cathode(negative)-Anode(positive)
Valve tubes/Diodes
- allow flow in one direction negative-positive
- lessons load on tube
- prolongs life
Focusing cup
- negatively charged
* keeps the electrons in a cloud
Cathode(filament)
•produces electrons through thermionic emissions
Anode
•receives/attracts electrons
Valve tube rules for conduction
- cathode-anode
* negative-positive
Why rectify X-ray tubes
•to be closer to DC •works more efficient on direct current
True/False X-ray tubes self rectify
•True
Actual focal spot
•perpendicular to target/anode face
How many pulses per sec. Does a full wave rectification have
•120 pulses per sec.
How many pulses per sec. Does a half wave rectification have
•60 pulses per sec.
Full wave rectification principle
•creates full wave rectified pulsed DC flow to tube
On an autotransformer what side is the line compensator on?
•input
Kv taps location
- major/minor kVp
* output taps
Autotransformer
•operates as primary/secondary coil by adjusting # of coils on either side
Equation for calculating heat units
- Kv x mA x time x constant
* constant is 1 for single phase
The smaller the anode angle..
•the larger the heel effect
Difenition of roentgen
•ionization of air
