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Flashcards in Imaging Safety Deck (25)
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1

contraindications to contrast?

renal function eg eGFR <30
contrast allergy

2

imaging is not usually done for __ week post-op patients

<6

3

contraindications to MRI?

pacemaker
some metallic implants

4

what areas of the body are most susceptible to radiation damage? what happens to them?

lens of eye -> cataracts
skin -> erythema
bone marrow -> dec production
gonads -> infertility

5

what layer of skin is most susceptible to radiation damage?

stratum corneum

6

what emits more radiation: CXR or lumbar spine XR

lumbar spine XR

(emits about 1mSV whereas CXR emits 0.02msV)

7

what cells have to be affected for someone's child to develop radiation-related developmental issues?

germline cells

8

name some long term somatic effects of radiation

cancer
cerebrovascular disease
cardiovascular disease

9

give an example of a stochastic effect of radiation

cancer
hereditary abnormalities

these do not have a set threshold at which they would occur, they just involve chance

10

give an example of a deterministic effect of radiation

erythema
cataracts
hair loss

these are guaranteed to occur above a certain threshold

11

the severity of a stochastic radiation effect increases with dose T/F

F

is unrelated to dose, it could happen at a low dose or a high dose

12

what imaging option has the most radiation exposure?

abdo CT (10msv)

13

how much radiation are we exposed to from our environment?

2msv

14

what kind of imaging exposes you to the same amount of radiation you would accumulate in a year?

head CT (2msv)

15

a barium enema emits more radiation than a lumbar spine XR T or F

T

BE emits about 3-8msv whereas a lumbar spine XR emits 0.7msv

16

what are the risks of radiation exposure early in pregnancy?

tissue abnormalities
slowed mental development
death
childhood cancer

17

which radiation risk during pregnancy is the most common?

fetal death

18

what fetal tissues are most at risk of malformation from radiation? why?

brain
CNS

these cells are highly undifferentiated

19

most neural development occurs between _ and - weeks

8 and 15

20

iodine based Tx or Ix can cause abnormalities where in the fetus?

thyroid

21

what advice should be given to a woman of childbearing age who is to receive radionucleotide Tx?

avoid conception for several months

22

radioactivity can be secreted in breast milk T/F

T

23

a woman should stop breastfeeding altogether if she is on radionucleotides T/F

F
depends on the radionucleotide strength

24

During the first __ days of the menstrual cycle it is thought that there is no significant risk of any radiation effect in a foetus that is conceived subsequently

10

(if radiation exposure occurs before ovulation the fetus should be unaffected)

25

An absorbed dose to the foetus of >__ mGy after the first few weeks of pregnancy could double the natural incidence of childhood cancer

10 (this is very unlikely though)