CHAPTER 23 : EXTRAORAL IMAGING Flashcards
this film is used for extraoral exposures
screen film
The use of a screen film and intensifying screens does what ?
minimizes xray exposure necessary to produce a diagnostic image
In film-based extraoral imaging, the occlusal film is used as a ______ film and does not require the use of screens for exposure
non screen
the occlusal film used extraorally requires (more) / (less) radiation exposure than does a screen film
MORE
Calcium Tungstate Screens• Emit___ light
• Used with ___ sensitive film
blue
blue
Rare Earth Screens: Emit ____ light
• Used with ___ sensitive film
- More efficient
- Less x-ray exposure
green
green
a device that converts x-ray energy into visible light; the light, in turn, exposes the screen film.
intensifying screen
this screen requires less exposure than calcium tungstate and is reccomended for exraoral based imaging
rare earth screen
used to hold the screen film in tight contact with the intensifying screens and to protect the film from exposure to light
cassette
The front side of the cassette must always face the ___ during exposure.
patient
the cassette must be ______ before exposure to orient the finished image; a metallic “R” or “L” can be used to identify the patient’s right or left side.
labelled
a device that may be used to reduce the amount of scatter radiation that reaches an extraoral film during exposure.
grid
A diagnostic extraoral image must demonstrate accurate anatomic features and proper ____ and _____
density
contrast
Extraoral projection techniques are classified by the area of interest and include:
lateral jaw imaging
skull imaging
TMJ joint imaging
