Chapter 6 (The X-Ray Imaging System) Flashcards
What are the three principal parts of an x-ray imaging system?
X-ray tube, operating console, high-voltage generator.
What is the primary function of the x-ray imaging system?
To provide a controlled flow of electrons for x-ray production.
What does kVp control in x-ray production?
X-ray beam quality (penetrability).
What does mAs control?
X-ray beam quantity (intensity).
What is the purpose of a high-voltage generator?
To step up voltage for x-ray production.
What is the purpose of the operating console?
Controls exposure settings (kVp, mAs, time).
What is the function of AEC (Automatic Exposure Control)?
Terminates exposure when sufficient x-rays reach the receptor.
What type of power supply do most x-ray systems use?
220V power supply.
What does a rectifier do in an x-ray system?
Converts AC to DC.
What is the difference between half-wave and full-wave rectification?
Half-wave blocks negative cycles, full-wave flips them positive.
What is voltage ripple?
The variation in voltage output from a power source.
Which power system produces the lowest voltage ripple?
High-frequency generators (<1% ripple).
What is the advantage of a three-phase power system?
Produces a more constant x-ray beam output.
What material is commonly used for x-ray tables?
Carbon fiber (low attenuation, high strength).
What is the function of a Bucky system?
Holds grids and cassettes to reduce scatter.
How does beam filtration affect image quality?
Removes low-energy x-rays, reducing patient dose.
What does line compensation do?
Adjusts incoming voltage to the correct level.
What happens if the SID increases?
mAs must be increased to maintain exposure.
What is the main advantage of high-frequency x-ray generators?
Better image quality with lower patient dose.
What is the role of a step-down transformer?
Reduces voltage to increase filament current for thermionic emission.
