RPs Flashcards
Cystography (voiding)
Vesicoureteral reflux RPs
DTPA
Sulfur Colloid
Pertechnetate
I131 OIH 150-300 uCi
Direct tc99m (catheter) 0.5-1 mCi
Indirect tc99m (inject) 3-10 mCi
Tc99m
half life, decay, and produced by
6 hours
Isomeric transition, Gamma
Generator
I131
half life, decay, and produced by
8.1 days
B-, gamma
Fission reactor
Renal Cortical imaging RPs
DMSA 1-6 mCi
GH 10-20 mCi
Renogram RPs
DTPA - for GFR 5-10 mCi
MAG3 - for ERPF 2-5 mCi
MAG3 localization for renals
Tubular secretion - ERPF
DTPA localization for renals
Glomerulus - GFR
DMSA localization for renals
Binds to plasma proteins in renal cortex - fixed in - slow clearance
Lasix dose
20-40 mg or based on creatinine
ACEI dose
25-59 mg Captopril, image after 1 hour
Infection imaging RPs
Tc99m tagged WBCs Exametazime (Ceretec) 5-10 mCi
In111 tagged WBCs 500 uCi
Ga67 Citrate 2-6 mCi
Ga67 half life, decay, produced, used for?
78.3 hours
Electron capture, gamma
Accelerator
Infection or tumors
4 energies - Med to High collimator
Ga67 localization and excretion
Iron analog, iron binding proteins
ER
Bowel/hepatobiliary
In111 oxine half life, decay, produced by
2.8 days
Electron capture, gamma
Accelerator produced
Med collimator
In111 oxine localization and excretion
RE
Bowel
Best RP for infection imaging in abdomen
In111
Best RP for infection imaging in spine
Ga67
GI bleed RPs
99mTc pertechnetate tagged RBCs 20-30 mCi
Sulfur colloid 10-20 mCi
Best RP for intermittent bleeding
99mTc pertechnetate tagged RBCs 20-30 mCi
Best RP for active bleeding
Sulfur Colloid 10-20 mCi
How much blood do you pull for GI bleed in vitro method?
2-2.5 mL
Tag with ultratag kit
What divides upper and lower GI tract
Ligament of Treitz
Renal cortical imaging RP
99mTc DMSA 1-6 mCi
99mTc GH 10-20 mCi
Thyroid RPs
99mTc Pertechnetate
I123 sodium iodide
I131 sodium iodide
99mTc imaging only; I123 and I131 are for uptake and imaging
I131 imaging is not recommended
Thyroid uptake doses
I123 - 100-200 uCi
I131 - 4-10 uCi
Thyroid imaging doses
99mTc 2-10 mCi
I123 200-600 uCi
I131 50-200 uCi
When is imaging preformed for thyroid RPs?
99mTc 15-30 mins
I123 3-4 or 16-24 hours
I131 6-24 hours
cold thyroid nodules mean?
carcinoma, benign adenoma, cyst, hematoma, inflamatory conditions
Hot thyroid nodule means?
benign
GI bleed RPs
99mTc pertechnetate Tagged RBCs
99mTc Sulfur Colloid
RBCs 20-30 mCi
SC 10-20 mCi
Best RP for intermittent GI bleed
99mTc Tagged RBCs
Sulfur colloid is best for active bleeding, it clears so fast
99mTc tagged RBCs for GI bleed localization and excretion
compartmental
excreted renally
Melena (black stool) indicates a GI bleed where?
upper GI
Normal uptake of 99mTc tagged RBCs
spleen, liver, great vessels, heart, bladder and kidney due to excretion
an active bleed with Sulfur Colloid will visualize in ___ minutes
5 minutes
Mebrofinin for HIDA takes up in what cells
Hepatocytes
Ga67 energies and collimator
93, 184, 296, 388 keV
Medium or high
Pt prep for Ga67
None except bowl prep
Tracer of choice when imaging for infection in the abdomen
In111 labeled WBCs
Bone marrow and WBC imaging
Sulfur colloid 10 mCi
And In111 WBCs 0.3-1 uCi
Either one can be injected first
2 day protocol
In111 pentetate DTPA energies
2 gamma
173, 247 keV