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Ch 42 extraoral xray
extraoral and digital radiography
| Question | Answer |
|---|---|
| special device that allows the operator to easily position both film and patient | cephalostat |
| image receptor found in the intraoral sensor | charge coupled device |
| filmless imaging system tha uses a sensor to caputre images, then coverts the images into electronic pieces and stores them in a computer | digital radiography |
| an image composed of pixels | digital image |
| to convert an image into a digital form that it turn can be processed by a computer | digitize |
| a technique in which the image is captured on an intraoral sensor and then is viewed on a computer monitor | direct digital imaging |
| feature that allows the operator to adjust the milliamperage and kilovoltage settings | exposure controls |
| rediographs taken when large areas of the skull or jaw must be examined | extraoral radiographs |
| imaginary three dimensional horse shoue shaped zone used to focus panoramic radiographs | focal trough |
| imaginary plane that passes through the top of the ear canal and the bottom of the eye socket | frankfort plane |
| an existing radiograph is scanned and converted into a digital form with the use of a charge coupled device camera | indirect digital imaging |
| imaginary line that divides the patients face into right and left sides | midsaggital plane |
| small detector that is placed intraorally to caputre a radiographic image | sensor |
| technique in which a digital image is caputred on phosphor coated plates and then is placed into an electronic processor where a laser scans the plate and produces an image on a computer screen | storage phosphor imaging |
| joint on each side of teh head that allows movement of the mandible | temporomandibular |
| radiographic technique that allows imaging of one layer or section fo the body while blurring images from structures in other planes | tomography |
| when are extraoral radiographs taken | when large areas of teh skull or jaw must be examined or when patients are unable to open their mouths for film placement |
| Panoramic radiographs allow the dentist to | view the entire dentition and related structures on a single film |
| the images on a panoramic film are not as well defined or clear as the images on intraoral films therefore __________ are used to supplement a panoramic film to detect________ | bitewing films, dental caries or periapical lesions |
| panoramic radiographs are used to: | locate impacted teeth, observe tooth eruption patterns, detect lesions in the jaw, detect features in the bone, provide an overall view of the mandible and maxilla |
| panoramic radiographs are not used for | substitute for intraoral films, diagnose dental caries, diagnose periodontal disease, diagnose periapical lesions |
| when taking a panoramic radiograph what supplies are used | panoramic xray unit, screen type film, intensifying screens and cassettes |
| if you do not remove all removable metal objects from the facial area you can get what kind of image on your panoramic radiograph | ghost images |
| if the patients lips are not closed during a panoramic radiograph the result is | a dark radioluent shadow that abscures the anterior teeth |
| where should the patient postition the tongue during a panoramic radiograph | in contact with the palate |
| if the tongue is not properly placed during a panoramic radiograph what is the result | a dark radiolucent shadow that obscures the apices of teh maxillary teeth |
| if the patient is positioned with the chin too high when taking a panoramic radiograph the result will be | a reverse smile line |
| if the patient is positioned with the chin too low when taking a panoramic radiograph the result is | an exaggerated smile line will be apparent |
| if the patients anterior teeth are positioned to far back on the bite block what is the result | the anterior teeth appear too fat |
| if the patients anterior teeth are not positioned in the groove on the bite block and are too far forward the teeth appear | to skinny and out of focus |
| if the patient is not standing or sitting with a straight spine what is the result | the cervical spine appears as a radiopacity in the center of the film |
Created by:
cynthia.fryer
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