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Dx Imaging (X-Ray Tube)
Terms in this set (19)
X-Rays are emitted __________ which means the photons are transmitted in all directions with equal directions.
X-Rays are emitted Isotropically, which means that ________?
The photons are transmitted in all directions with equal directions.
What is the glass envelope?
Maintains a vacuum, made from Pyrex glass to withstand heat.
What is the window of te X-ray tube?
Thinner area of the envelope which allowed maximum emission of x-rays without absorption. It is what the x-rays are emitted through.
What is the charge of the cathode?
What happens when you change the current of the filament?
You control the current of the X-ray tube.
What is the filament of the X-ray tube made of?
What is the function of the X-ray tube filament?
Emits electrons when heated
What is the Thermionic emission of the X-ray tube filament?
Boiling off electrons
How is the thermionic emission related to the mA?
200 mA = twice the amount
What is the charge of the focusing cup?
What is the function of the Focusing cup?
Electrostatically confines the electron beam to a small area of the anode.
What is the dual focusing cup?
Focal spot size is controlled by heating one of the two filaments.
What is the anode?
receives electrons, conducts electricity, radiates heat, and contains the target.
What is the charge of the Anode?
What is the function of the Anode?
- Electrical conductor
- Mechanical support
- Thermal dispatcher
Why does the anode rotate?
- Allows it to produce high intensity x-rays in a short time.
- Provides nearly 500x more area for the electron beam to interact than the stationary. (3400 revs/min)
What is the target of the Anode?
Why is tungsten used?
- High anatomic number = high efficiency x-ray production
- Thermal conductivity = efficient metal for dissipating heat.
- High melting point 3400 C.
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