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14 Cards in this Set
- Front
- Back
What was Ga-67 Citrate first used for?
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bone imaging
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What are the characteristics of Ga-67?
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Energies: 93, 184, 296, 388 KeV
T 1/2 = 78 hours Decay: EC, Gamma |
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What type of collimator is used for Ga-67?
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LEHR or Medium
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What are the indications for Ga-67 Citrate scan?
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- fever of unknown origin
- Pulmonary disorders - myocardial or pericardial inflammatory processes - immuno-compromised pts (AIDs) |
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What are the advantages of using Ga-67?
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- does not require a blood withdrawl
- easy to prepare - easy to administer |
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What are the disadvantages of using Ga-67?
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- GI tract accumulation
- results are delayed for 24-72 hours - 64% specificity - long T 1/2 (78 hrs) - high energy - upper colon is the critical organ |
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What is the adult dose and ROA for Ga-67 citrate?
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5-10 mCi
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How soon can imaging begin after administering Ga-67 Citrate?
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As early as 6 hours and continued for 24, 48, and 72 post injection
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What percentage of Ga-67 is excreted by the kidneys?
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20-25%
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What percentage of Ga-67 is excreted by the bowels?
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20-25%
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Where is Ga-67 activity expected to accumulate?
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liver, spleen, bone marrow, skeleton, bowel and kidneys
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At 72 hours post injection, what organs should not be visible?
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the kidneys
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What images should be acquired for a Ga-67 Citrate scan?
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WB Statics: head/neck, chest, pelvis, lower extremeties
-or- WB sweep (10 cm/min) |
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What is the MOL for Ga-67 Citrate?
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It is an iron analogue so it binds to iron-binding protiens. It competes for iron sites and is absorbed by lysosomes and ER of WBC
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