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14 Cards in this Set
- Front
- Back
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What are the two tracers used for GI bleeding
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99tc-RBC-20mCi
99Tc-sulfur Colloid- 10mCi |
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What tracer is used for lower GI bleeds only
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99tc-RBC-20mCi
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What tracer is used for continous imaging of the abdomen
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99tc sulfur colloid 10mCi
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Why are blood tracers used ?
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bc GI bleeding is an intermittent phenomenon and is sometimes missed by angiograms
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If there is tracer inbetween the common iliacs where is the MC source of bleeding
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rectum
(make sure it is not the bladder or ureters) |
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What are some problems with interpreting blood scans
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the blood will pool (and not be by the source) and there is some guess work with where the source of bleeding is
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What is the tracer used to find a meckels diverticulmn
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99tc-pertechnetate
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Will you see all most meckels with a meckel scan
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no, only the ones with gastric mucosa
but they are the only ones that need to be seen bc they are the only ones that bleed. |
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What is the sequence of a meckels scan
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blood pool and then after 15 minuts the stomach is seen
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Is the kidney and bladder seen well in a meckels scan
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yes
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What is seen in an abnormal meckels scan
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small, discrete, collection of tracer in the RLQ that increases progressively with the same timing as the stomach
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What are some causes of confusion with meckels scan
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renal collecting sytem or ureters
normal gastric activity in bowel inflammatory process (crohns, tumor, appendicitis, intussusception) |
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How do you differentiate a meckels diverticulum from endometrial activity or inflammatory activity such as IBD
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meckels accumulates with time and the others clear out with time
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What is a good way to differentiate a splenule from a mass
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Tc sulfur colloid study and the splenule will take up tracer
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