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15 Cards in this Set

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