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9 Cards in this Set
- Front
- Back
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Give some examples of imaging techniques |
- Xrays - CT - MRI - PET - Ultrasound - Angiogram |
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What are some of the downsides of Xray scans? |
- They have no functional representation - you only get a 2D view of a 3D image - it causes radiation exposure |
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How does a CT scanner work? |
CTs essentially take multiple Xrays all around the body to get multiple views of the same body part. They are much more radiation intensive |
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What are the relative exposures for the different types of imaging involving Xrays? |
Chest Xray - 0.02 mSv (2-3 days worth) Head CT - 2 mSv (1 yr worth) Abdomen CT - 10 mSv ( 5 Yr worth) |
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Who is at increased risk of cancer from Xray scans? |
- women of childbearing age - pregnant patients - children and teenagers |
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How do MRIs work? |
They use large magnets and spinning protons to create a very clear picture of soft tissues |
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What are some drawbacks to MRIs? |
- Very dangerous if the patient has metal anywhere on them, eg pacemaker or fragments in eyes - some patients struggle with claustrophobia - takes up to an hour, while CT takes a few seconds |
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Which category of patients does Ultrasound not work for? |
Obese patients |
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What is the order of density in a CT/Xray? |
Air > Fat > Fluid > Soft tissue > Bone > Metal |
