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16 Cards in this Set
- Front
- Back
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What are the physical characteristics of Tc99m-Exametazime?
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Energy: 140 KeV
T 1/2: 6 hrs Decay: IT, Gamma Produced by: Generator |
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What is another name for Tc99m-Exametazime?
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Tc99m-Ceretec
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What is the method of localization for Tc99m-Ceretec labeled WBCs?
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WBC migration through chemotaxis.
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What is the plasma half life of Tc99m-Ceretec?
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~ 4 hours
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What was Tc99m Exametazime originally developed for?
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Regional Cerebral Blood Flow (rCBF)
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What is the adult dose range for Tc99m-Ceretec?
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10-25 mCi
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How is the dose prepared for injection?
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1. Request blood sample kit from pharmacy
2. Prepare syringe (60-100 ml) with ACD or heparin 3. Obtain 40-50 ml of pt's blood with heparinized syringe and large-guage needle 4. gently invert for 1 minute 5. label syringe and prepare to return to pharmacy for tagging ~~~upon return from pharmacy~~~ 1. Verify dose belongs to pt 2. Assay dose 3. Reinject WBCs slowly & flush well |
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What collimator is used to image when using Tc99m-Exametazime?
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LEHR or Medium
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What are the indications for performing a Tc99m-Ceretec WBC Scan?
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- Infection/Inflammation
- Abcess - Irritable Bowel Disease - Osteromyelitis |
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How long after reinjection of tagged Tc99m-Ceretec WBCs can imaging begin?
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~ 1-4hours
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What are the advantages of Tcc99m-Ceretec WBC?
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- fast uptake of Tc99m-Ceretec permits earlier imaging
- low absorbed dose makes imaging suitable for children (.74 rem/ 10 mCi) |
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What are the disadvantages of theTcc99m-Ceretec WBC?
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- requires 40-50 ml of blood withdrawl
- 2-3 hour labeling process - short T 1/2 = 6 hrs - displays activity in GI tract, urinary tract, and GB |
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What is the max amt of time recommended between drawing the pt's blood and reinjection?
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no more than 5 hours
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What is the recommended use for labeled cells?
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Within 1 hour of preparation and in no case more than 3 hours after preparation!
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What is the normal activity distribution for Tc99m-Ceretec?
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kidneys, bladder, liver, spleen, gall bladder
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What images are obtained when performing a Tc99m-Exametazime WBC scan?
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WB Statics: Head/Neck, Chest, pelvis, lower extremeties
-or- WB Sweep |
