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Filtration-Pam09
| Question | Answer |
|---|---|
| Define "filtration" | The process of removing "undesirable" low energy xray photons via insertion of absorbing materials in the primary beam. |
| What is another name for filtration? | Hardening |
| What is the only purpose of filtration? | To lower the patient's radiation dose |
| What are the 2 ways filtration is measured? | 1. Al/Eq (Aluminum Equivalent) 2. HVL (Half Value Layer) |
| What is the HVL? | The amount of absorbing material that will reduce intensity by 1/2 |
| ____ mm Al/Eq is for equipment over 70 kVp | 2.5 |
| ____mm Al/Eq is for equipment between 50-70 kVp | 1.5 |
| ____mm Al/Eq is for equipment below 50 kVp | 0.5 |
| HVL affects Quality or Quantity? | Quality |
| What 2 areas of radiography use equipment below 50 kVp? | 1. Mammography 2. Dental radiography |
| What are the 4 types of filtration? | 1. Inherent 2. Added 3. Total 4. Compensation |
| What is inherent filtration | Filtration that is built into the x ray tube |
| What 3 items are part of inherent filtration? | 1. Glass envelope 2. Di-electric oil 3. Glass window |
| ___mm Al/Eq makes up inherent filtration | 0.5-1.0 |
| What material does mammography use for their tube window? As opposed to...? Why? | Beryllium, instead of Pyrex. So they don't filter out absorbing rays they need for extra detail. |
| What is added filtration? | Any filtration outside of the tube & housing & before the IR |
| ___mm Al/Eq makes up the collimator | 1.0 |
| What type of filtration is the mirror? | Added |
| What is total filtration? | Inherent + Added |
| What is a compensation filter? | A device providing a more uniform density |
| What 4 substance can a compensation filter be made of? | 1. Aluminum 2. ClearPb(Lead) 3. Plastic 4. Saline bag |
| What are 3 examples of when a compensation filter would be used? | 1. Foot x-ray 2. T-Spine x-ray 3. Chest x-ray |
| What is a Wedge filter? | A wedge shaped device that gives a uniform density when the part is larger on one side than another |
| When using a Wedge filter, the ___ end goes over the thinner area of the body part | Thicker |
| When using a Wedge filter, the ___ end goes over the thicker area of the body part. | Thinner |
| What is a Trough? | A device that gives a uniform density when the body part is thicker on the edges and thinner in the middle |
| What is another name for a Trough? | Double Wedge |
| What is an example of when a Trough would be used? | Chest x-ray |
| What must happen to technique when adding a filter? | Technique must go up |
| What happens to density when a filter is introduced? Contrast? | Density decreases Contrast decreases |
Created by:
mornstein
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