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15 Cards in this Set
- Front
- Back
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How does I-131 decay?
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Beta emission.
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Half life of I-131.
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8 days
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Principal gamma emission of I-131?
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364 keV
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High thyroid dose makes I-131 undesirable for routine imaging of the thyroid?
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Yes, but then that makes it an ideal radiotherapeutic agent for treating certain thyroid disorders.
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What is the advantage of long half life of I-131?
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Advantage in scanning for the detection of functioning metastatic thyroid carcinoma because imaging can be done over several days to allow for optimum concentration by metastatic deposits.
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I-123 decays by ?
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Electron capture
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Principal photon energy of I-123 is ?
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159 keV
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Half life of I-123?
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13 hours
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What is the iodine of choice for thyroid imaging?
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I-123.
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On a 99mTc-pertechnetate scan, what is well seen in addition to the thyroid?
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salivary glands.
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Name 3 conditions in which 99mTc-pertechnetate is preferred over radioiodine?
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Patient receiving thyroid blocking agents, unable to take medication orally, or study < 2 hours.
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Nursing can be resumed how many hours after 99mTc-pertechnetate?
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12-24 hours after admin.
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Nursing can be resumed how many days after I-123 admin?
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2 to 3 days
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I-131 is not recommended for what 2 populations?
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Children and pregnant women.
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What is the formula for % thyroid uptake
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(Neck counts-thigh counts)/counts in standard x 100 %
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