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DENTAL NURSE > Unit 306- radiography > Flashcards

Unit 306- radiography Flashcards

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1
Q

what does the step wedge test and what is it

A

developer solution
quality
aluminium step

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2
Q

layers of the film

A

paper film paper foil

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3
Q

what happens when mounting is done wrong

A

wrong treatment could be provided

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4
Q

when are radiation monitoring badges worn

A

by nurses when there is more than 150 intra-oral exposures or more than 50 pantomographs

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5
Q

what is the x-ray called showing both jaws

A

panoramic tomograph

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6
Q

what is automatic processing and the order

A

series chemicals at precise time and temperature
films dropped into roller(conveyor belt), developer, fixer, water, drier

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7
Q

3 types of intra-oral x-rays

A

horizontal and vertical(shows roots) bitewing
periapical
anterior occlusal

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8
Q

3 regulations for radiography

A

ionising radiation regulation IRR99
ionising radiation medical exposures IR(ME)R
local rules

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9
Q

what does ALARP mean

A

as low as reasonably practicable

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10
Q

what is scatter radiation

A

bounces of tissue cells and can re-expose patients

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11
Q

what does ALARP do to help scatter radiation 3 things

A

-fast films
-short exposure time
-rectangular collimator tube

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12
Q

what three people should there be in the work place

A

1- legal person(ensures workplace is in compliance)
2- radiation protection advisor(gives advice)
3- radiation protection supervisor(assess risks and ensure precautions)

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13
Q

how far is controlled area

A

2m or further

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14
Q

what is isolation switch

A

cut of circuit from power source

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15
Q

what does the radiation protection file include

A

-local rules
-risk assessment by legal person
-patient protection
-alarp
details of the quality assurance programme

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16
Q

who supplies the badges

A

radiation protection division

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17
Q

what is the substance called when absorbed or scattered and what is it called when passes through

A

-radiopaque
-radiolucent

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18
Q

how often should moderate caries risk and high caries risk be radiographed

A

moderate- every year
high-6 months

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19
Q

layers of extra oral film

A

cassette case
intensifying screen
rare earth coating
xray film

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20
Q

whats the intensifying screen for

A

reduce to dose of radiation exposure

21
Q

what happens with cassette after exposure

A

-take to a dark room
-place in cassette container

22
Q

how does intensifying screens create an image

A

fluorescence brightness

23
Q

name extra-oral radiographs

A

-DPT/OPT/OPG
-lateral oblique(3rd molar, one side mandible)
-lateral skull(side of the head, uses machine called cephalostat, jaw growth, ortho)

24
Q

what is bisecting angle technique

A

at an angle due to restricted patients size of mouth used non anterior occlusal and lateral oblique

24
Q

what is the paralleling technique

A

exactly parallel to the tooth same size as tooth

25
Q

what is digital radiography

A

x-ray is fired at sensor plate which converts image on the computer directly

26
Q

what happens if light enters the light tight lid container

A

image could be lost

27
Q

automatic processing explained

A

-check chemical and water levels
-temperature is correct
-film placed
-removed packet
-developer, fixer, water, drier

28
Q

what is manual processing

A

dark room with 4 tanks- developer, water, fixer, water that sit in a bath at 18-22 degree
orange light for some vision

29
Q

what is mounting

A

positioning x-ray on a light box and magnifier

30
Q

shorting of image

A

collimator angulation too steep

31
Q

elongation of image

A

collimator angulation too shallow producing long image

32
Q

coning

A

not central film partly exposed

33
Q

blurred

A

moving during exposure

34
Q

faint image

A

film is placed wrong way
developer solution weak, temp low

35
Q

fogged

A

exposed to light before

36
Q

blank film/loss of film

A

machines not on
film stuck in roller

37
Q

scratches or fingerprints

A

not holding film by edges

38
Q

blank spots

A

fixer splashed before developer

39
Q

black line across film

A

film bent

40
Q

brown stains

A

incorrect fixing old solution

41
Q

crazed film

A

dried too quick

42
Q

crystals

A

not washed good after fixing

43
Q

dark film

A

developer solution too much, temp too high

44
Q

partly blank film

A

partially immersed in developer

45
Q

fading image

A

not enough in fixer

46
Q

artefacts

A

solution spillages

47
Q

what is digital indirect

A

phosphor plate exposure then scanned to PSP scanner passes onto computer carestream

DENTAL NURSE (12 decks)

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