Radiation Safety for Fluoroscopy – Exam to
Document Knowledge - Pass Grade 75%
Exam Questions
Name:
Date:
1. The radiation intensity striking a physician one meter from a patient is about _____ of the intensity
striking the patient?
1/1000
1/100
1/10
2. Lead aprons used during fluoroscopy typically attenuate ____% of the incident radiation beam.
50
75
95
3. Early transient erythmia will become apparent at ____, peaks at ____, and fades in ____ after reaching
the threshold radiation
5 minutes, 30 minutes, and several hours
6 hours, 24 hours, and several hours
several hours, 24 hours, and several days
several hours, 12 hours, and 1 month
4. The threshold radiation dose for early transient skin erythema is about:
100 rem
200 rem
300 rem
5. Utilizing “Last image hold” on a fluoroscopic unit will result in:
Lower patient dose due to lower beam-on time
No change in dose
Higher dose due to more radiation required to produce this static image
6. Using the collimators to reduce the x-ray beam will _____ the patient’s risk of injury and _____ the
image contrast.
reduce, not change
improve, reduce
improve, increase
reduce, improve
7. A medical physicist will re-measure typical dose rates for each fluoroscopy unit:
every 6 months
every year
every five years
8. Magnifying the viewed area on the patient by decreasing the image intensifier field size will ______ the
patient skin dose:
markedly decrease
not change
markedly increase
9. On a large patient, the optional “high level” fluoroscopic button will increase dose rate by a factor of
____ over normal mode fluoroscopic levels
2-4
5-10
20-30
10. For a given total amount of skin radiation, small children are _____ to harmful skin effects than adults.
less sensitive
equally sensitive
more sensitive
11. The determination of radiation induced skin injury is the total amount of dose received by all skin _____.
on the patient
on one limb
at one skin location
12. The threshold dose for permanent depilation is about:
200 rem
400 rem
700 rem
Original Release 3.2009: Reviewed & Revised 1.1.2015; Expiration Date 12.31.2017
All members of the CME Committee and anyone else in a position to control the content of this
activity have no relevant financial relationships to disclose.
Page 1 of 2
Radiation Safety for Fluoroscopy – Exam to
Document Knowledge - Pass Grade 75%
Exam Questions
13. Positioning the image intensifier closer to the patient’s skin will _______________ patient skin dose.
markedly lower
not change
markedly raise
14. Nationwide, the most common operator error for c-arm units that unnecessarily increases maximum
patient dose is:
opening collimator wider than necessary
selecting higher tube current during normal mode fluoroscopy
placing x-ray tube too close to skin
15. The skin dose to a small child will generally be ______ the dose to an adult for the same procedure and
duration.
less than
the same as
greater than
16. Varying the x-ray beam entry point over the skin will _____________.
increase the risk of injury by irradiating more skin
reduce risk because any single skin area receives less radiation
17. Results from radiation monitors (PMD’S) worn outside the lead apron are posted in departments where
all personnel should review their monthly radiation dose. The maximum allowed absorbed equivalent
dose is __________.
5000 rem/year
5000 rem/quarter
5 rem/month
18. Slanting the x-ray beam through the patient at an oblique angle will __________ patient radiation dose.
somewhat decrease
not affect
markedly raise
19. There is a true marked difference in skin sensitivity to radiation between the sexes.
True
False
20. All x-ray units can be adjusted to give lower radiation levels in exchange for:
nosier images
lower resolution of vessels containing contrast media
prolonging the length of the procedure
Original Release 3.2009: Reviewed & Revised 1.1.2015; Expiration Date 12.31.2017
All members of the CME Committee and anyone else in a position to control the content of this
activity have no relevant financial relationships to disclose.
Page 2 of 2