DASA Radiography Exam: Well Verified Questions & Accurate Answers A+GRADED!!!!
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Course
DASA Radiography
Institution
DASA Radiography
DASA Radiography Exam: Well Verified Questions &
Accurate Answers A+GRADED!!!!
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What's direct action film? - CORRECT ANSWER -- Intra oral film. Only sensitive to
xray photons
What's indirect action film - CORRECT ANSWER -- Extra oral with intensify...
DASA Radiography Exam: Well Verified Questions &
Accurate Answers A+GRADED!!!!
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What's direct action film? - CORRECT ANSWER -- Intra oral film. Only sensitive to
xray photons
What's indirect action film - CORRECT ANSWER -- Extra oral with intensifying
screen & cassette . sensitive to light photons
Why is direct action film used for intra oral - CORRECT ANSWER -- For excellent
image quality
black paper is used on either side of the film to protect the film from...? - CORRECT
ANSWER -- Light
damage by fingers
saliva that may leak into film packet
Why is a thin sheet of lead foil placed behind the film? - CORRECT ANSWER -- To
stop residual radiation going further into pt tissues
To stop secondary radiation from scattering back onto film and degrading the image
If film was placed wrong way in pts mouth the lead foil would show on radiograph
making the fault easily identified
Increasing the Ma will make the image - CORRECT ANSWER -- too dark/blacken
Decreasing the mA will make the image - CORRECT ANSWER -- Too white / light
What % of energy is conducted as heat and X-rays ? - CORRECT ANSWER -- Heat
-99%
Xrays - 1%
What is the recommended FSD - CORRECT ANSWER -- 200mm or 20cm
What are the dose units used for radiography - CORRECT ANSWER -- Radiation
absorbed dose
Equivalent dose
Effective dose
What dose is the actual dose patients are interested in? - CORRECT ANSWER --
Effective dose
, What is the effective dose from one intra oral radiograph ? - CORRECT ANSWER --
0.022&0.0003 millisievert msv
What are the steps involved for effective dose ? - CORRECT ANSWER -- Radiation
absorbed dose x weighting factor = equivalent dose
Equivalent dose x tissue weighting factor = effective dose
Add all effective doses added up for final effective dose
Definition of paralleling technique - CORRECT ANSWER -- Image receptor parallel
to the long axis of the tooth and X-ray beam at right angles to tooth and image
receptor
Clinical indications for periapical paralleling technique ? There's 7 - CORRECT
ANSWER -- 1- apical infection
2-periodontal tissues
3- trauma to teeth & bone
4- root numbers and shape before XLA
5-before during and after endo
6-before and after apical surgery
7-post op and evaluation of implants
If the position of the tooth is not ideal the image may be ?
Foreshortened
Elongated
Distorted - CORRECT ANSWER -- Forshortened
If the position of the image receptor isn't ideal / slanted the image may appear?
Distorted
Foreshortened
Elongated - CORRECT ANSWER -- Elongated
If the X-ray position is not ideal the image may appear ?
Distorted
Elongated
Foreshortened - CORRECT ANSWER -- Distorted
Why might the tooth not be able to touch the image receptor ? - CORRECT
ANSWER -- Pts anatomy
In order for the tooth and image receptor to be parallel they have to be ? -
CORRECT ANSWER -- Some distance apart to ensure the whole tooth and apical
tissues are recorded
What is the guidance note FGDP recommendation for paralleling technique -
CORRECT ANSWER -- Using a film , phosphor plate or sensor holder which has a
aiming device
What does a short focus to skin distance do - CORRECT ANSWER -- Diverges the
beam making it magnified
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