Radiography Flashcards
What is the deterministic effect of radiation
Effects of radiation that only occur after a threshold has been reached
What are the effects of deterministic effects
Nausea, cataracts and erythema
What are stochastic affects of radiation
Effects in which the effect depends on the dose (no threshold dose level)
What are the effects of stochastic radiation
DNA disruption and cancer
What is radioactivity
The amount of ionising radiation released
What is exposure
The amount of radiation travelling through the air
What is absorption
The amount of radiation absorbed by a person or object
What is the dose equivalent
Combination of the amount of radiation absorbed and the medical effect of the radiation
What is dose equivalent measure in
Sievert
What is the value of background radiation
2.4 mSv
What considerations must be taken before exposure goes someone to radiation
Pregnancy stays, kidney problems, if better tests can be taken
What 3 planes can MRI scans be taken in
Axial, coronal and sagitaal
How can contrast medias be given
Orally, rectally, IV or IA
What is an example of a positive media
Iodine
What do positive contrast medias do
Give white images
What do negative contrast medias show
Black images
Give an example of a negative contrast media
Water, air, CO2
What are Idiosyncratic reaction
Reactions to contrast media occurring within 20 mins
What are no -idiosyncratic reactions
Reactions to contrast media that occurs after 30mins from the dose
Which type of osmolality are better to use for contrast medias
Low
What is the main type of excretion of contrast media
Glomerular filtration
What is the typical half life of constraint medias
30-60 mins
