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Dental radiography mock exam > radiography > Flashcards

radiography Flashcards

1
Q

The collective term for best describing the black, white and grey shadowing on a developed xray are better known as…..

A

Contrast

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2
Q

What type of radiation is used in dentistry?

A

Ionising Radiation

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3
Q

When we talk about Z in Radiation, what do we mean ?

A

The number of Protons (+) In the nucleus of an atom

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4
Q

The nucleus is made up of what?

A

Neutrons (no charge) and protons (+)

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5
Q

What is the process known as removing an electron (-) from an atom?

A

Ionisation

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6
Q

The closest shell to the nucleus is known as the what?

A

K Shell

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7
Q

What does the focusing device do in the x-ray tube?

A

It aims the stream of electrons (-) at the focal spot of the target

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8
Q

When does heat producing collisions take place?

A

When an incoming electron collides with an outer shell

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9
Q

Continuous spectrum happens when?

A

the xray electron passes close to the nucleus of the atom

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10
Q

What is attenuation in relation to xrays striking matter?

A

Absorption and scatter

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11
Q

When electrons (-) bombard the target, What percentage of xrays produced?

A

1%

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12
Q

What is the radiation absorbed dose?

A

The measure of the amount of energy absorbed from the radiation beam per unit mass of tissue

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13
Q

What is the background radiation estimated at approximately?

A

2.7 mSv

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14
Q

Deterministic effects will happen if….?

A

….the body is exposed to a high dose of radiation

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15
Q

The photoelectric effect is described as…?

A

Pure absorption with low energy photons

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16
Q

A step down transformer is used for what….?

A

Changes the incoming mains voltage from 240v to a low voltage current required to heat the filament

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17
Q

What is indirect action to cells within the body?

A

Involves the breakdown of water molecules

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18
Q

Fatal radiation induced malignancy from a BW xray in adults- What is the risk?

A

1 in 20000000

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19
Q

What is a spacer cone also known as?

A

beam indicating device

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20
Q

What is a direct action radiographic film?

A

is sensitive primarily to xray photons

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21
Q

What does the lead foil do in a xray film packet?

A

prevents scattered radiation

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22
Q

Calcium tungstate screeens are sensitive to what coloured light?

A

Blue

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23
Q

In chemical processing the silver halide crystals are converted to what colour metallic silver in the development stage?

A

Black

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24
Q

In this instance in chemical processing the temperature of the developer is 20 oC, how long should the film be immersed for?

A

5 minutes

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25
Q

The Ionising Radiations Regulations 2017……

A

Came into force on 1st January 2018

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26
Q

The Ionising Radiation (medical exposure) Regulations 2018 states that….

A

the practitioner must justify an exposure

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27
Q

Non classified workers in relation to radiation, their dose per year should not exceed

A

6mSv a year

28
Q

Radiolucency on a radiography will show as….?

A

completely Black

29
Q

What is and advantage of using the bisecting angle technique?

A

is quick and simple to use

30
Q

When taking a BW xray the tubehead should be positioned….?

A

5-8o downwards

31
Q

What is and advantage of using BW holder?

A

the image receptor is held firmly in position and cannot be displaced by the tongue

32
Q

What is an upper standard occlusal radiograph used to?

A

detecting unerupted canines or supernumeries

33
Q

cephalometric radiographs…..

A

Can be used in orthognathic surgery planning

34
Q

In dental panoramic tomography…..

A

The focal trough is horseshoe shaped

35
Q

When positioning a patient for DPT the patient should….

A

Keep their spine straight

36
Q

A main advantage of using DPT is….

A

compared to full mouth survey using intraoral films it is about 1/5 the radiation dose

37
Q

A too dark image is caused by…..

A

being overdeveloped

38
Q

Images that are unsharp/blurred could be caused by?

A

film packet being excessively bent

39
Q

Where do you find cervical burn out?

A

at the neck of the tooth. (not to be mixed up with root caries)

40
Q

What is the correct colour of mop and bucket to clean a surgery floor?

A

yellow

41
Q

How many hours of eCPD do you need to complete in a 5 year cycle?

A

50

42
Q

How many principles are there in the GDC standards? 5,6,7,8,9

A

9

43
Q

What has a target?

A

Anode

44
Q

A photon charge is…?

A

nil

45
Q

What is Z?

A

the atomic number

46
Q

What is removed from an inner to an outer shell to cause excitation?

A

electron

47
Q

braking radiation is also known as…?

A

continuous spectrum

48
Q

electrons jumping from one energy shell to another and emits xray photons is called..?

A

characteristic spectrum

49
Q

energy below 69.5 kV is known as what?

A

characteristic k line

50
Q

Which is the fastest intensifying screen?

A

rare earth

51
Q

Which states xray equipment having to have a light, audible warning when exposing xray?

A

Ionising radiation regulations

52
Q

Who is responsible for overall safety of staff when using radiation?

A

radiation protection supervisor

53
Q

Which clarifies the positions of responsibility regarding employer, referrer and operator?

A

Ionising radiation (medical exposure) regulations

54
Q

what should be kept by all xray machines?

A

local rules

55
Q

what should be used by all staff taking more than 100 intraoral or 50 extraoral xrays a year?

A

personal monitoring

56
Q

All patients should be treatment using….?

A

safety glasses/spectacles

57
Q

What should not be used when opening film packets?

A

powdered gloves

58
Q

how should pts be seated when taking bws?

A

occlusal plan horizontal

59
Q

when xraying pt what should you think about before hand…..?

A

pt dose constraints and radiographic audit

60
Q

under which heading checks the performance of the counterbalance for the correct position of the tube head

A

equipment checks

61
Q

the coin test comes under which heading/checks?

A

darkroom inspection

62
Q

what is directly associated with step-wedge test?

A

image processing

63
Q

inverse square law is best related to what?

A

increasing the distance between the radiation source and the personnel

64
Q

Your employer gives training on new receptor holders, , what are you most likely to consider when using these?

A

avoiding unnecessary radiography

65
Q

A 16 year old boy comes to do work experience at the practice, you ask work colleague to look after him whilst xrays are being taken. What should be considered?

A

reducing exposure factors

66
Q

Changing from D speed to E speed, what should be considered?

A

reduce exposure factors

Dental radiography mock exam (2 decks)

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