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Warm up the anode; Do not make repeated exposures near the tube limits
How can you extend the x-ray tube life?
Autotransformer; Line Voltage Compensator; kVp Meter; Exposure Timer; Line Meter
Low Voltage Circuit contains:
More efficient; reduce patient dose
Advantages of high frequency generator over single or three-phase generators?
Anode begins to rotate; full heat is applied to the filament
What happens when the rotor switch is activated?
The center detector is always located in the center of the IR at the central ray.
Where is the AEC detector located on a three-detector system?
An AEC which works when a specific quantity of current has been measured in this circuit, the exposure will be terminated.
More sophisticated than synchronous timers for use with three phase and high frequency generators.
Varies the resistance in the circuit which permits control of the amperage circuit
What does a Rheostat do?
Controlled by a small electric motor rotating at 60 rev/sec. each 60 impulses in the electric cycle can be used as an exposure time.
Falling Load Generator
Computer controlled; begin the exposure at the highest mA compatible with the desired filament/focal spot selection.
Reproducibility of exposure; mAs Reciprocity; mA and exposure time linearity.
What are the three control checks to ensure mA settings accuracy?
Depends on the back-up timer (may be synchronous or electronic)
Minimum exposure time for automated timers?
What is the maximum variability of the exposure timer, for times greater than 10 milliseconds?
Public Law 90-602
Generators must terminate the exposure at 600mAs for exposures above 50kVp and 2000 mAs for exposure below 50kVp). Primarily for mammography.
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