4. Radiological Interpretation - CBCT

Question 1

why CBCT?

Answer 1

provides desired diagnostic yield
low patient risk
low cost

Question 2

when is a pan or PA useful?

Answer 2

initial and / or postoperative assessment

Question 3

when is a pan or PA unsuitable?

Answer 3

unsuitable as a single imaging source for dental implant assessment due to inablity to assess the buccolingual dimension and inherent inacuraces

Question 4

why are CBCTs not used as routine postoperative assessment?

Answer 4

too much exposure
too much artifact

Question 5

imaging protocol should include the ____ FOV necessary

Answer 5

smallest

Question 6

CBCT image acquisition - depends on 4 aspects

Answer 6

1. x-ray generation
2. image detection system (receptor)
3. image reconstruction (computer)
4. image display

Question 7

2 principles of CBCT

Answer 7

1. x-ray source and detector move synchronously
2. x-ray beam is usually pulsed to reduce exposure

Question 8

why not use CBCT on every patient?

Answer 8

must be aware of radiation exposure

Question 9

stochastic effects

Answer 9

main effect: cancer!

-risk is proportional to dose
-has no threshold dose
-severity is independent of the dose

Question 10

deterministic effects

Answer 10

includes in utero birth defects, skin erythema, cataracts

has a threshold dose, above hwich the effect happens

Question 11

are stochastic or deterministic effects of concern in dentistry?

Answer 11

stochastic

Question 12

DICOM

Answer 12

digital imaging and communication in medicine

Question 13

proprietary files

Answer 13

are specific to the manufacturer

can only be opened by the manufacturer’s software