Radiography Flashcards Preview

clinical practise 2 > Radiography > Flashcards

Flashcards in Radiography Deck (23)
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1
Q

what is a radiograph?

A

an image produced by x-rays passing through an object and interacting the the photographic emulsion on a film.

2
Q

why are radiographs useful?

A

they allow us to look inside the body, particularly at the mineralised tissues. Other advanced techinques allow us to look at soft tissue aswell.

3
Q

what dose is from a panoramic? and how many days does it last?

A
  • 4-30 microSv

- 1-3 days

4
Q

what dose from a periapical? and over how many hours/days?

A
  • 1-8.3 microSv

- 8-40 hrs

5
Q

how many intra oral examinations are taken each year roughly?

A

over 10 million

6
Q

how many panoramic x-rays are taken each year roughly?

A

over 3 million

7
Q

what does the term ‘somatic’ mean?

A

-affecting those iradiated

8
Q

do deterministic effects of radiation occur in dentistry?

A
  • No

- only non-deterministic effects occur

9
Q

what does ALARP stand for?

A

As Low As Reasonably Possible

10
Q

what are some warnigng signs that a radiograph is about to be taken?

A
  • visible light and audible noise when x-rays produced
  • operator should be able to prevent access to controlled area
  • control panels/switches are outside the control area
11
Q

why might a peri-apical be taken?

A
  • detect apical inflammation
  • assess perio problems
  • trauma/fractures
  • tooth morphology pre-extraction
  • presence/position of unerupted teeth
  • endodontics
  • pre/post apical surgery
  • eruption of implants
12
Q

what are the two techniques of taking a periapical?

A
  • paralleling

- bisected angle

13
Q

name 4 different image receptors

A
  • direct film
  • indirect film
  • DR (CCD or CMOS)
  • CR (PSP)
14
Q

what receptor sizes are used for bitewings?

A

0,1,2

15
Q

what receptor sizes are used for young children?

A

0,1

16
Q

what receptor size for adults anterior are used?

A

1

17
Q

what receptor size for adult posterior periapical is used?

A

2

18
Q

what receptor size is used for occlusals?

A

4

19
Q

how is human error reduced?

A
  • introducing simpler systems
  • improve working enviroment
  • encourage reporting without blame
20
Q

what are the two legislations for radiography

A
  • IR(ME)R 200 -protects the pt

- IRR 99 -protects staff and public

21
Q

is caries on a radiograph over or underestimated?

A

underestimated

22
Q

what is the dose of exposure for a dental x-ray?

A

0.005mSv

23
Q

what is the does of of exposure from 100g Brazil nuts?

A

-0.01mSv