RANDOM RADIOTRACER STUFF
MIBG = Norepinephrine (Pheochromocytomas, Carcinoid, Medullary Thyroid Ca, Retinoblastomas) . stop insulin, reserpine, TCAs, and amphetamine-like drugs before MIBG scan.
Octreotide = Somatostatin Receptor Analog (see uptake in Medullary Thyroid Ca, Small Cell Ca, Meningioma)
Typically CNS lymphoma, toxoplasmosis, bacterial abscess, Cryptococcus infection, and tuberculosis are all positive on Ga-67 scintigraphy whereas only CNS lymphoma will be positive on Tl-201.
Use Ga-67 for vertebral OM, since IN-111 doesnt really have uptake in spine. Use IN-111 for ABD INFECTION/INFLAMMATION since Ga-67 has physiologic bowel uptake.
Thallium-201 = Decays via electron capture to Mercaury-201, CRITICAL ORGAN = KIDNEYS, 73 HR 1/2 life, text
The dose limits of medical radiation exposure to the public is 100 mrem (0.1 rem) per year, or 2 mrem in any 1 hour.
- GM counter should be calibrated ONCE A YEAR
-IN-111 = Label and reinject pt, then image 24 hours later (otherwise might get false positive with lung uptake)
-Bone scans w/ IN-111 and Tc-Sulfur Colloid = Do In-111 first, then Tc-SULFUR COLLOID for the marrow, wait 30 minutes after sulfur colloid before getting images