radiology Flashcards
Name the error that could have occurred to produce the following faults in a panoramic radiograph:
The film shows anterior teeth that are out of focus and magnified.
The pt is too far away.
Name the error that could have occurred to produce the following faults in a panoramic radiograph:
The molars are larger on one side than the other.
The patient is rotated - has their head to 1 side so they are asymmetrically positioned in the machine.
Name the error that could have occurred to produce the following faults in a panoramic radiograph:
Vertical or horizontal distortion of 1 part of the image.
The pt moved whilst the radiograph is being taken.
Name the error that could have occurred to produce the following faults in a panoramic radiograph:
The radiograph is too dark.
- overexposure (increased exposure time)
- overdevelopment
- fogging (due to poor storage of the film of light leaking)
- pt with very thin tissues
4 ways to minimise the radiation dose to the pt having an intraoral radiograph.
- rectangular collimation
- fast film type
- high voltage of 70 kV (optimal kV)
- justification
What are stochastic effects?
Random events.
How does ionising radiation affect the body?
Direct or Indirect Damage
- Direct Damage — ionising biological molecules such as DNA.
- Indirect Damage — ionising water which then produces free radicals that can then cause problems elsewhere.
What does the acronym ALARP stand for?
As Low As Reasonably Practicable
(aims to minimise the exposure to radiation)
One technique for taking periapical radiographs is the paralleling technique.
Name another.
bisecting angle technique
According to the IR(ME)R regulations, what is the role of the:
REFERRER
Responsible for supplying the practitioner with sufficient information to justify the radiograph being taken.
According to the IR(ME)R regulations, what is the role of the:
PRACTITIONER
Justifies the exposure and that the benefits outweigh the risks.
According to the IR(ME)R regulations, what is the role of the:
OPERATOR
Any adequately trained professional who carries out the exposure.
According to the IR(ME)R regulations, what is the role of the:
EMPLOYER
The person with legal responsibility for radiological installation - must ensure regulations are enforced, usually the practice owner.
Who comes up with the local rules for radiation?
Radiation Protection Supervisor
Which type of imaging has been decided as the gold standard for dental imaging?
CBCT
