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In the occlusal technique, the film is positioned so that the ________side is facing the arch that is being exposed; and it is placed in the mouth between the ___________ surfaces of the teeth
occlusal technique that is usede to examine the palate and the anterior teeth of the maxilla
What angle is the PID directed at for each of the following projections?
mandibular cross sectional
technique used to examine the palatal roots of the molar teeth, and may often be used to locate foreign bodies in the posterior maxilla
maxillary lateral projection
Used to examine the anterior teeth of the maxilla, and is recommended for used in children 5 or younger
Used to examine the anterior teeth of the mandible
used to examine the buccal and lingual aspects of the mandible, also used to locate foreign bodies or salivary stones in the region of the floor of the mouth
used to examine the anterior teeth of the mandible and is recommended for use in children 5 or younger
Which of the following can a radiograph depict?
rule governing the orientation of structures portrayed in two radiographs exposed at different angulations
buccal object rule
In the buccal object rule, 2 radiographs are taken with different ________ angles
What is the mnemonic used for the buccal object rule? What does it mean?
- same lingual opposite buccal
rule where one PA is taken, and then an occlusal film is exposed directing the central ray at a right angle to the film; primarily used for locating objects in the mandible
right angle technique
Why is less x-radiation neede for a digital image? and how much less exposure time is needed for digital radiography than conventional?
- the typical sensor is more sensitive to x-rays then conventional film
What do most digital radiography systems use for their x-radiation source?
a conventional dental x-ray unit
a small box or 'well' into which the electrons produced by the x-ray unit exposure are deposited, it is the digital equivalent of silver halide crystals used in conventional radiography
true or false. A pixel is an ordered arrangement
What are the two essential components in indirect digital imaging?
- same as direct digital imaging:
- x-ray machine
- intraoral sensor
- and also:
- CCD camera
Why is indirect digital imaging considered inferior to direct digital imaging?
the resultant image from direct digital is similar to a copy versus the original
In the storage phosphor imaging system, what is used instead of a sensor with a fiber cable?
reusable imaging plate coated with phosphor
How are images cleared from storage phosphor image plates?
by exposure to the view box light for several minutes
What are the advantages of digital radiography?
- superior gray-scale resolution
- reduced exposure time to radiation
- increased speed of image viewing
- lower equipment cost - after the initial cost
- increased efficiency
- enahancement of diagnostic image
- effective patient education tool
What are the disadvantages of digital radiography?
- Initial set up costs
- image quality
- sensor size
- infection control
- legal issues