Chapter 15 - Doses and Risks of Diagnostic Radiology Flashcards
What is the target organ in nuc med?
Is the organ of interest
What is the critical organ?
An organ that has affinity for the radiopharmaceutical but of no interest in the study.
A dramatic increase in Nuc Med studies come from?
Cardiology
US does what percentage of the worlds Nuc Med studies?
50%
What deterministic reaction (tissue reactions) do you see with fluoro and why?
It is such a high dose
Skin rashs and ulcerations
What make up the natural background radiation?
Cosmic
Earth’s crust (uranium and thorium in the soil)
Internal (potassium-40 and radon)
What is the largest source of natural background radiation?
Radon
Most of the risk from diagnostic radiology is what type of effects?
Stochastic
What are the exceptation to the rule about radiology only involving stochastic effect?
Exposure to embryos
Fluoro studies with deterministic effect
What is the effective dose?
Takes into account dose and sensitivity of the tissue
Gray is?
absorbed dose
Sievert is?
unit of effective dose
Person Sievert?
collective effective dose
What is collective effective dose?
effective dose on a whole population
Difference in types of radiation used in SPECT vs PET?
SPECT uses gamma emitting radiopharm
PET uses positions and annihilation
