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X-RayTube Part 2 147
| Question | Answer |
|---|---|
| What is the function of the x-ray induction motor? | Spin the anode inside the X-ray tube |
| The Stator is composed of Electromagnets that completely surround the rotor that _____ | Induce the turning of the rotor |
| The Rotor is a _______ | Tube shaft that attaches to the anode disk |
| How does the Whole Motor Work? | AC current flows through the stator coils |
| The magnetic fields in the coils______ | Constantly Change |
| The rotor is pulled around by _______ which reaches through the glass tube | The Magnetic Field |
| The rotor spins the anode at______ | Thousands of revolutions per minute |
| The spinning anode spreads the ________ over a larger area, preventing damage | Heat from the Electron Beam |
| Focal spot “Blooming” is an increase in ________ size | Actual Focal Spot |
| What effect does Blooming have on the image? | Reduced spatial resolution (less image sharpness) |
| What is the cause of Blooming? | At very high mA, electrons repel one another more as they travel from the filament to the anode |
| _______ occurs when Electrons strike areas of the anode outside the focal spot | Off-Focus Radiation |
| What is the cause of Off-Focus Radiation? | Electrons are scattered after hitting the actual focal spot, producing additional unwanted x-rays |
| What effect does Off-Focus Radiation have on the image? | Increased blur and reduced image contrast |
| Added tube filtration = | 2.0 mm |
| Total tube filtration = | 2.5 mm |
| Inherent tube filtration = | 0.5 mm |
| Window in glass envelope- | Inherent Tube Filtration |
| Below Window & Mirror- | Added Tube Filtration |
| What does filtration do? | Removes low energy x-ray beams |
| ______ is called “hardening” the beam | Increasing the average energy (kVp) |
| Higher kVp = | Higher Penetration |
| Higher penetration = | Less Absorption |
| Less absorption = | Lower Patient Dose |
| How is filtration measured? | Half Value Layer |
| Half Value Layer is the ________ (measured in mm of aluminum [Al] or aluminum equivalent filtration) | Thickness of absorbing material necessary to reduce the intensity of the beam to one-half its original intensity |
| Half Value Layer is a measure of _______ | Beam Quality (kVp) |
| What is the first step when Determining Half Value Layer? | Measure the intensity of the beam with a radiation detector |
| What is the second step when Determining Half Value Layer? | Place aluminum filters between the tube and the radiation detector until the intensity reading is reduced to one-half the original value |
| What is the Final step when Determining Half Value Layer? | Measure the total thickness of the aluminum. This is the half value layer |
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user-2016295