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12 Cards in this Set
- Front
- Back
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Difference between plain films and fluoroscopy x-rays
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plain are short exposure for x-rays
fluoro is longer exposure |
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What is fluoro good for?
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Anything that moves (Gi, diaphragm, BV)
Moving things in body (catheters, skeletal fixation devices) |
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Downside to fluoroscopy
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radiation exposure
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4 ways to practice radiation protection
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lead aprons
TV fluoroscopy with electronic image intensifier limit time of study pulsed fluoroscopy |
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What is a contrast agent?
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material given orally or IV to enhance or get more info from an image
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2 main types of contrast agents
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oral or GI contrast
IV contrast agents (vessels, vasculature, renal collecting system) Can also have organ specific contrast agents |
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2 classes of GI contrast
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Barium sulfate
water soluble contrast |
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Describe the properties of barium sulfate
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Suspension of fine particles.
Nonabsorbable, can't use if leak from GI tract suspected. Also, don't want to sit in colon for prolonged time b/c convert to barium rock |
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Properties of water soluble agents
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iodinated aromatics
-hypertonic solution, can't use if aspiration is a concern, will pull water into the lungs -not as dense as barium -doesn't coat well |
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two main classes of vascular contrast
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iodine based contrast (CT, IVP, Angio)
Gadalinium based (MRI) |
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Why is gadolinium used in MRIs?
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Strongly paramagnetic (shows like iodinated contrast like CT)
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radiofrequency ablation
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target previously difficult to reach tumors
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