dental x-ray equipment Flashcards
what is intra-oral dental unit
dedicated piece of equipment that allows following examinations to be taken
- upper and lower occlusal
- periapical and bitewing
Occlusal view
Periapical view
Bite wing detector
Tank construction
how long is the dental x ray tube
15cm long
1 inch diameter
how is intra-oral dental unit powered?
domestic mains supply
- structures are of low density
- short SID ensures efficient exposure on image receptor
what is the kVp setting of intra-oral unit
LOW
70
what is the tube current of intra-oral unit
LOW
10 mA
what does a low output mean?
that there is low level of heat produced within tube head and allows for tank construction
advantages of tank construction
- lightweight
- compact
- easy to manoeuvre around head
-has no trailing high-tension cables
what is the cone required to do under the IRR 2018
to restrict the size of beam and control FFD/SID
what is the tube head and where is it encased
stationary anode/ filament encased in borosilicate glass
what are the main features of a x-ray tube head
- attached to multi-jointed arm - allows for range of movements
- can be wall/ ceiling mounted
- scales allow for accurate + repeatable positioning
what is the kVp and mA pre set at on control panel
kVp - 70
mA - 10
focal spot - 0.6mm2
A cone
lead lined to control scatter and ensure radiation protection - controls FFD/ SID to ensure minimum source skin distance (20cm)
what does glass window at exit port of tube casing provide
inherent filtration
what are digital dental units
- digital detectors
- reduces dose to patient due to sensitivity
- automatic grey level adjustment
- image enhancement
what is dental panoramic tomography
a 2D x-ray examination that captures entire mouth and jaw in single image
what joints will dental panoramic tomography use
images the facial bones and tempero-mandibular joints
how is normal tomography achieved?
- by keeping body part still
- by moving x-ray tube one way and detector in the other direction
what is the principle of x-ray tomography
uses ability of x-ray radiation to penetrate objects
- fulcrum/ pivot
