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Panoramic imaging
Oral Radiography DENT-120
| Term | Definition |
|---|---|
| panoramic imaging | an extraoral technique used to examine the maxilla and mandible on a single projection |
| Used for | evaluation of dentition and supporting structure, impacted teeth, eruption patterns, growth and development. Detection of lesions and conditions of the jaws. Examining the extent of large lesions, and evaluating trauma |
| Not used for | caries diagnosis, periodontal disease, or periapical lesions. Not a substitute for intraoral projections |
| Tomography | an imaging technique that allows the imaging of one layer or section of the body, while blurring the images of structures in other planes. |
| Rotation center | the axis around which the receptor and x-ray tubehead rotate. Modern tubeheads use a continuously moving center rather than multiple fixed center locations. |
| focal trough | a three-dimensional curved zone in which structures are clearly demonstrated on a panoramic image |
| real image | results when a structure lies between the receptor and the moving rotation center. Appears in the correct anatomic location |
| double image | results when an anatomic structure that is located behind the moving rotation center is penetrated twice by the x-ray. Mirror image |
| ghost image | results when an anatomic structure or object is located outside the focal plane and close to the x-ray source. Resembles it's true image and is found on the opposite side of the receptor. Blurred, magnified, and higher than the actual image |
| Pano collumator | a lead plate with an opening in the shape of a narrow vertical slit |
| Tubehead | always rotates behind the patients head |
| head positioner | chin rest, notched bite block, forehead rest and lateral guides |
| Time of exposure | ranges from 10-30seconds |
| Image receptors | direct digital sensor (CCD or CMOS), PSP plate or film |
| Screen Film | type of film used in film based panoramic imaging. Sensitive to light emitted from intensifying screens. Comes in 5x12 and 6x12in |
| T-Mat film | sensitive to green light, rare earth, require less radiation |
| X-Omat DBF film | sensitive to blue light, calcium tungstate |
| cassette | device used to hold extraoral film and intensifying screens. Light tight. Marked with a metal letter R to indicate patients right side, Film can be labeled immediately after processing with a marking pen or adhesive label |
| density | ideally not excessive. An overexposed digital image can present areas of 'burnout", but be corrected with software, an underexposed image cannot |
| contrast | ideal contrast should allow for the identification of the junction between the enamel and the dentin in the molar region. Inadequate contrast may lead to problems with the detection of unerupted teeth. |
Created by:
SonyaP
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