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Bushong ch 7
The x-ray tube
| Question | Answer |
|---|---|
| What is the name of the most frequently used support system? | ceiling support |
| What components make up the external structure of the x-ray tube? | support structure, protective housing, glass or metal enclosure |
| The ______ _______ provides mechanical support. | protective housing |
| What is the positive side of the x-ray tube called? | anode |
| What is the negative side of the x-ray tube called? | cathode |
| This occurs when the tungsten vaporizes,coats the inside of the glass housing, and then causes the current to stray. | arcing |
| What are the 2 parts of the cathode? | filament, focusing cup |
| What is the most common cause of tube failure? | tungsten vaporization |
| What is the filament made of? | tungsten |
| The boiling off of electrons is known as? | thermonic emission |
| What is the target of a rotating anode coated with? | tungsten |
| What does thermonic emission cause to happen at the filament? | space charge effect |
| WHat is the actual source of x-rays in the tube? | the focal spot |
| What is the size of most filaments? | 1-2 cm long, 2mm wide |
| When is the small focal spot used? | when better spatial resolution is required |
| What turns the rotating anode? | magnetic field |
| Name the 2 types of anodes. | stationary and rotating |
| How much of the electron interaction with the anode turned into heat? | 99% |
| What is the target of the anode? | the area of the anode struck by electrons from the cathode |
| What is a rotating anode made of? | tungsten alloy |
| High capacity tubes rotate at up to ________ rpm. | 10,000 |
| What components make up the induction motor? | rotor, stator |
| what is the rotor? | a shaft made of copper and soft iron |
| What is the stator? | a series of magnets placed around the neck of the tube |
| What is the anode heel effect? | When the intensity is greater on the cathode side than the anode |
| The smaller the ______ the greater the heel effect. | angle |
| When imaging a larger patient, the ______ should be directed over the larger part. | cathode |
| Due to the line focus principle, the target angle is made _______, so the effective focal spot is ________. | smaller, smaller |
| What is the formula for Heat units of a 3phase 6 pulse x-ray machine? | 1.41 X kVp X mA X s |
| What does it mean when a tube has 2 focal spot sizes or a dual tube? | it has 2 filaments |
| What does each tube rating charts have in common with one another? | they are all the maximum eposure times that is safe for the tube |
| Where is the stator located in the x-ray tube? | outside the glass enclosure |
| Where is the rotor located in the x-ray tube? | inside the glass enclosure behind the anode |
| What causes the anode heel effect? | the angle of the stationary anode |
| This occurs when the electrons bounce off the focal spot and land on other areas of the target, causing x-rays to be produced outside the focal spot(scatter). | off focus radiation |
| The actual focal spot size is ______ than the effective focal spot size in the line focus principle. | larger than |
| When the anode has pits or cracks in it, what caused this? | the temp of the anode is excessive during a single exposure |
Created by:
radgirl37
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