Quiz
Radiography 1
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Questions in this quiz (63)
1Where should the front edge of a bitewing radiograph be aligned?
- AMesial edge of the upper first pre-molar
- BDistal edge of the upper first pre-molar
- CMesial edge of the upper second pre-molar
- DDistal edge of the upper first molar
2Which type of bitewing radiography is more commonly used?
- AHorizontal
- BVertical
3In a bitewing radiograph, the film should be positioned [blank_start]perpendicular[blank_end] to the occlusal surfaces of the teeth / central x-ray beam.
- Aat 90°
- Bat 45°
- Cat 30°
4When may a bitewing radiograph be prescribed?
- AAssessing occlusal and interproximal caries of multiple teeth
- BAssessing crowns of pre-molars and molars on one side of the mouth
- CMonitoring periodontal status
- DAssessing individual teeth and their apical tissues
5What % of radiographs must be of excellent quality, with no errors in exposure, positioning or processing?
- A70%
- B80%
- C50%
- D30%
6What colour of envelope is used to request a radiograph in the X-ray department?
- AWhite
- BGreen
- CWhite/Purple
7A _______ envelope is used to request a radiograph on clinics
- AGreen
- BWhite
- CWhite/Purple
8What size of film is used when taking anterior periapical radiographs?
- ASize 0
- BSize 2
- CSize 4
9Size 4 film is used for what type of radiograph?
- AOcclusal
- BPosterior periapical
- CBitewing
- DAnterior periapical
10What size of film is used when taking posterior periapical radiographs?
- ASize 2
- BSize 4
- CSize 1
- DSize 0
11Posterior periapicals and Bitewing radiographs are both taken using the same size of film.
- ATrue
- BFalse
12The white side of the X-ray film faces [blank_start]toward[blank_end] the X-ray tube.
- Atowards
- Baway from
13Radiographs should be prescribed to screen for disease.
- ATrue
- BFalse
14Select the correct indications for use of a peri-apical radiograph
- APeriodontal status
- BPost-operative evaluation of implants
- CApical infection
- DEndodontic treatment
- EInterproximal caries
- FOcclusal caries
15Which type of X-ray film holder is used when using the bisecting angle technique?
- ARinn Snaparay
- BRinn anterior holder
- CRinn endoray
- DHawes-Kwikbite
16The paralleling periapical technique is [blank_start]reproducible[blank_end] since the X-ray film and tube are held in place with a holder.
- Areproducible
- Bnot reproducible
17In the paralleling periapical technique, the tooth and sensor are in contact.
- ATrue
- BFalse
18In both the ideal and parallelling periapical technique, which two things are parallel?
- ASensor
- BLong axis of the tooth
- COcclusal surface of the tooth
- DFree gingival groove
19In the ideal technique, the tooth and sensor are in contact.
- ATrue
- BFalse
20The best way to describe the bisecting angle technique is...
- APoorly reproducible
- BEasy to set up
- CHighly reproducible
- DA type of technique used when taking bitewing radiographs
21The angle between which two features is bisected to reach the bisected angle?
- ALong axis of tooth
- BLong axis of sensor
- COcclusal surface of tooth
- DAlveolar crest of bone
22Where is the central X-ray beam directed in the bisecting angle technique?
- AApex of the tooth
- BLong axis of the tooth
- CPulpal horns
- DPulp chamber of the tooth
23What does ALARP stand for?
- AAs low as reasonably practicable
- BAs little as radiographically possible
- CAs low as radiationally possible
- DAdminister local anaesthetic for radiation protection
24Poor contrast may be as a result of...
- APoor processing
- BWrong kV used
- CExposure to daylight
- DInsufficient exposure
25Shorter roots can be caused by [blank_start]too much[blank_end] vertical angulation.
- Atoo much
- Btoo little
26An overexposed image is darker than an optimally exposed image.
- ATrue
- BFalse
27Which side of the sensor faces the X-ray tube?
- AWhite side
- BWhite/Purple side
28Which side of the sensor faces away from the X-ray tube?
- AWhite/Purple side
- BWhite side
29For peri-apical radiographs, the embossed dot should aim towards the...
- ACrown of the teeth
- BApex of the root
- CPulp chamber
30For bite wing radiographs, the embossed dot should aim towards the...
- AUpper teeth
- BLower teeth
- CApex of the lower teeth
31What type of film is used for extra oral radiography?
- ADirect
- BIndirect
32What type of film is used for intra oral radiography?
- ADirect
- BIndirect
33Direct film is primarly responsive to
- AX-ray photons
- BLight photons
34Indirect film is primarly sensitive to
- ALight photons
- BX-ray photons
35Indirect film does not have embossed dot therefore L+R markers are used in the casette.
- ATrue
- BFalse
36Which of these are components used in intensifying screens?
- ACalcium Tungstate
- BLanthanum
- CGadolinium
- DSilver halide
- EYttrium
37Intensifying screens reduce patient dose but consequently produce a lower resolution image.
- ATrue
- BFalse
38If a direct film is placed the wrong way round, there is no way of telling that an error has been made.
- ATrue
- BFalse
39Label the image of the direct X-ray film
- AProtective gelatin layer
- BEmulsion (silver halide)
- CAdhesive
- DPlastic base
40When X-ray photons strike the silver halide emulsion of the film, what happens to the silver halide emulsion?
- AIt is sensitised
- BIt is excited
- CIt is neutralised
- DIt is oxidised
41When X-ray photons hit the silver halide emulsion, does this form the visible or latent image?
- ALatent image
- BVisible image
42The embossed dot should face toward the operator and x-ray tube.
- ATrue
- BFalse
43In a CCD X-rays hit the [blank_start]scintillation[blank_end] layer above the matrix/array and are converted to [blank_start]light[blank_end] photons. This creates a [blank_start]charge packet[blank_end] which represents the [blank_start]latent[blank_end] image. This is transmitted as an [blank_start]analogue[blank_end] voltage then converted by an analogue-digital converter to the digital image.
- Ascintillation
- Blight
- Ccharge packet
- Dlatent
- Eanalogue
44Instead of film, what do PSPP systems use?
- ABarium fluorohalide phosphor
- BSilver halide
- CGadolinium
- DLanthanum
45For a PSPP system, the barium [blank_start]fluorohalide[blank_end] phosphor layer absorbs the X-ray photons and stores them (X-rays not [blank_start]attenuated[blank_end] by patient). The image plate is then placed in a laser reader and this causes the stored X-rays to be released as light. A [blank_start]photomultiplier[blank_end] tube then detects this light energy and converts it into a voltage which is then interpreted by a computer and displayed as a digital image.
- Afluorohalide
- Battenuated
- Cphotomultiplier
46Select the disadvantages of digital film
- ALoss of quality if printed
- BImage alteration possible
- CExpensive to initially implement
- DHigher dose
- ESlower processing
47Select the advantages of digital film
- ALower dose
- BFaster processing
- CEasy transfer
- DInexpensive to implement
- ELess security required in software
48Digital X-ray processing:
1. [blank_start]Analogue[blank_end] voltage converted to numerical [blank_start]digital[blank_end] signal
2. Each pixel given x,y coordinate and [blank_start]number[blank_end]
3. The computer then allocates the number a shade of [blank_start]grey[blank_end] scale- AAnalogue
- BDigital
- Cdigital
- Danalogue
- Enumber
- Fhash
- Ggrey
- Hthe visible spectrum
49A number 0 given to a pixel represents a black shade on the grey scale. What does this mean about X-ray attenuation of the patient?
- AThe patient has not attenuated any of the X-rays
- BThe patient has fully attenuated the X-rays
50A number 255 given to a pixel represents a white shade on the grey scale. What does this mean about X-ray attenuation of the patient?
- AAll of the X-rays have been attenuated by the patient
- BSome of the X-rays have been attenuated by the patient
- CNone of the X-rays have been attenuated by the patient
51Which factors affect the final resolution and size of a digital X-ray image?
- ANumber of pixels
- BSize of pixels
- CNumber of shades available from grey scale
- DType of pixel
- EX-ray attenuation by patient
52Put in the correct order the processing of X-ray film
1. [blank_start]Development[blank_end]
2. [blank_start]Fixation[blank_end]
3. [blank_start]Washing[blank_end]- ADevelopment
- BFixation
- CWashing
53During development of X-ray film, sensitised silver halide ions are reduced to black metallic silver. What part of the image does this produce?
- ABlack/Grey part
- BWhite part
54Too long development of X-ray film leads to an image that is...
- AToo dark
- BToo pale
55What is the name of the active ingredient in the developing solution used to develop X-ray film?
- AHydroquinone
- BCamphoroquinone
- CGamma-methacryloxypropyltrimethoxysilane
56During fixation of the X-ray film image, what substance is used to remove unsensitised silver halide ions?
- AAmmonium thiosulphate
- BCopper sulphate
- CSodium hexafluoride
57The removal of unsensitised silver halide ions results in which parts of the image?
- ATransparent/White
- BBlack/Grey
58The time taken to clear unsensitised silver halide ions is known as the...
- AClearing time
- BWashing time
- CFixation time
- DOxidation time
59The X-ray film is fixed for ........ the clearing time
- ADouble
- BTriple
- CHalf
60The fixation solution is alkaline and thus contamination with the alkaline developer solution is not a problem.
- ATrue
- BFalse
61The X-ray film emulsion is ........... by aliminium chloride.
- AHardened
- BSoftened
- CFixed
62After fixation, X-rays films are washed to remove residual chemicals. What chemical is used to wash them?
- AWater
- BAmmonium thiosulphate
- CHydrogen peroxide
- DEthanol
63In manual processing there is sometimes an extra washing stage - when is this completed?
- ABefore development
- BBetween development and fixation
- CBetween fixation and washing
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- Part 1 Radiography Quiz containing questions from Introduction to Intra-oral Radiography and Radiographic films/processing.
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