Term
| A decrease of intensity on the anode side of x-ray beam due to angle |
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Definition
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Term
| Metal deposits on the inner wall of the envelope that attract electrons from the cathode |
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Definition
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Term
| The control panel of the x-ray machine |
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Definition
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Term
| Controls the length of the exposure |
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Definition
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Term
| A positively charged electrode that acts as a target for the electrons from the cathode |
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Definition
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Term
| The peak of energy of the x-rays which determines the quality of beam |
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Definition
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Term
| The small area of the target with which electrons collide on anode |
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Definition
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Term
| Low energy circuit, when heated, releases electrons from their orbits |
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Definition
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Term
| Amount of electrical energy bein applied to the filament |
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Definition
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Term
| Metal commonly used in focusing cups |
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Definition
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Term
| Wave rectification creates constant electrical potential across the tube |
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Definition
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Term
| Wave rectification converts alternating to direct current |
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Definition
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Term
| A restricting device used to control the size of the primary beam |
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Definition
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Term
| Acts as the kilovoltage selector |
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Definition
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Term
| Negatively charged electrode that provides a source of electrons |
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Definition
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Term
| Partial outer shadow of an object |
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Definition
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Term
| Electrical energy being applied to anode and cathode to accelerate the electrons |
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Definition
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Term
| A recessed area where the filamen lies, directing the electrons toward the anode |
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Definition
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Term
| Common metal used in the filament of the cathode |
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Definition
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Term
| This produces a controlled x-ray beam and accelerates electrons while housing the cathode and anode |
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Definition
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Term
| The x-ray tube is encased in oil for this reason: |
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Definition
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Term
| Due to excess heat x-rays will scatter in all directions losing energy and will appear lighter on film this is called? |
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Definition
"Pitting"
Note: Stationary/dental and small portable machines are prone to this occurenece if not properly used |
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Term
True or False
Small focal spots result in greater detail |
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Definition
True
Remember: Ideally you want a small focal spot with an adequately large target |
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Term
| Is an equation, the difference between the actual and apparent focalspot |
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Definition
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Term
| What is the number one cause of tube failure? |
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Definition
| Filament evaportaion due to high temperature and long heating times. Make sure everything is ready before you depress the button. |
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Term
| The waring out of bearings due to unnecessary use of pre-exposure button can lead to what type of failure? |
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Definition
Anode Bearing Failure
Remember:If it gets worse it can decrease anode speed leading to over heating of targets which results in Andode Target Failure |
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Term
| Tube failure can be caused : |
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Definition
| By either glass envelope damage or tube housing damage (shift of glass envelope or oil leak) |
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Term
| What are some electrical components of the x-ray machine? |
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Definition
- High-Voltage Circuit
- Line-Voltage Compensator
- Low-Voltage (filament) Circuit
- Timer Switch
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Term
| Step-down transformer is placed between the cathode filament and the imput voltage, it reduces voltage to what? |
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Definition
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Term
| The step-up transformer increases voltage from 110 or 220 volts to what? |
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Definition
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Term
True or False
The fewer the turns in the coil on the secondary (output) side the lower the output voltage will be |
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Definition
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Term
| The auto transformers initial setting is 65 volts which means that it will or will not leave the auto transformer at 65 volts |
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Definition
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Term
True or False
The secondary coil in the step-up transformer has 1000 times as many turns as the primary coil |
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Definition
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Term
| When the low-voltage circuit heats the filament this last for how long? |
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Definition
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Term
True or False
Voltage starts at zero and reahces a maximum of 110 or 220 before going back to zero |
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Definition
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Term
| The process of changing AC to DC which occurs in the x-ray tube: |
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Definition
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Term
| This prevents the reverse flow of electrons when a half-wave rectification is occuring: |
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Definition
| Valve tubes/AKA Self rectifiers |
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Term
| This rectification has constant electrical potential across the tube at 120 time/second making twic the xrays produced and less exposure is needed: |
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Definition
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Term
| X-ray tubing rating is based on what four things? |
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Definition
- Focal spot size
- Target angle
- Anode speed
- Electrical current- single or three phase
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Term
| What is the maximum electrical thermal rating for portable and tabletop? |
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Definition
- 60 to 90 kvp-portable
- 40 to 120 kvp- tabletop
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Term
| A restricting device that control the primary beam and prevent unnecessary radiation to the patient and personnel: |
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Definition
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Term
| This supports the x-ray tube and can come in varying designs: |
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Definition
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Term
| What does the control panel (the console) consist of? |
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Definition
- On/off switch
- Voltage compensator
- Kilovoltage selector
- Millamperage selector
- Timer
- Exposure Button- two stage button
- Warning light
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Term
| These are used to increase the potential power of th electrical supply: |
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Definition
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Term
| This generator is used for more powerful/shorter exposure times: |
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Definition
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Term
| How can anode target failure be prevented? |
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Definition
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