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RADT 334 x-ray tube
radiographic physics review covering x-ray tube
Question | Answer |
---|---|
What does the filament do? | The filament emits electrons when it is heated. |
Lists the two types of anodes. | Stationary and Rotating. |
What type of anode is best used in tubes that don't require high tube current and power? | Stationary. |
Which type of tube enclosure has the longest life? | Metal |
True or False? The anode is the negatively charged side of the x-ray tube? | False. It is the positive side. |
What is the space-charge effect? | The space charge makes it difficult for subsequent electrons to be emitted by the filament. |
What is space charge? | Emitted electrons form a cloud around the filament before releasing to the anode. |
List three functions that the anode serves in an x-ray tube? | It is an electrical conductor, mechanical support and thermal dissipator. |
List the three causes of x-ray tube failure. | Heat in the tube, heat of the anode for prolong periods and electron arcing from the filament. |
List the three ways heat can be dissipated. | Radiation, Conduction and Convection. |
What are the three types of x-ray tube rating charts important to the technologist? | Radiographic rating chart, anode cooling chart and housing cooling chart. |
What is the most important rating chart? | Radiographic rating chart. |
What area of the tube housing allows the for the x-ray beams to travel towards the patient? | Window |
Virtually all high-capacity x-ray tubes use what type of enclosures? | Metal |
What part of the x-ray tube has the filament embedded in it? | Focusing cup. |
What is the most frequently used support system? | Ceiling support. |
Name the three different support systems. | Ceiling, floor-to-ceiling and C-arm support systems. |
What does the protective housing do? | Controls leakage and scatter radiation, isolates the high voltages and provides a means to cool the tube. |
Why is glass enclosures usually made out of Pyrex? | To help withstand the heat generated. |
The weaker intensity of x-ray beam is on what side of the tube? | The anode side. |
What unit is x-ray thermal energy measured in? | Heat Units |