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Panoramic Imaging

Chapter 22 DNH 130

Purpose and Use of Panos evalute impacted teeth evaluate eruption patterns detect diseases trauma eval 3rd molars
Does the patient sit or stand for panos either
Is the receptor intraoral or extraoral extraoral
Sectioning certain parts of the body for optimum viewing quality whiles blurring other images in other plans of film is called tomography
The rotation center is the point or axis around which the cassette carrier and tube head rotate
When the jaws are positioned outside the focal trough the image will appear...? blurred or distorted
The focal trough is narrower in the anterior or posterior areas? anterior
Define real image structures that lie between the receptor and the moving rotation center and appear in the correct anatomic postions
focal trough 3d curved zone where the dental arches must be positioned to achieve the clearest image
define double image restulst when the atomic structure is behind the moving rotation center
causes of ghost images earrings, glasses
example of double image cervical spine
equipment associated with panos xray unit screen film intestfying screen cassette
pano machine components tube head head positoner exposure controls
What shape is the collimator for the pano narrow rectangle
The tube head is in a fixed position and the ________ angulation cannot be changed vertical
The beam is directed slightly ________ upward
The parts of the head positioner chin rest notched bite block forehead rest lateral head supports
What can be changed on the exposure control to accomodate a patients size? kVp and mA
Is the exposure time fixed or variable? fixed (10-30 secs)
Types of receptors based on the type of machine digital phosphor film based
Two types of intensifying screens calcium tungstate rare earth green
What are cassettes devices to hold film and intensifying screen
Is the bite block disposable. No, the bite block is covered with a barrier
do you use a lead apron with or without thyroid collar? without
do you use a single sided or double sided apron? double sided
Where do you direct the patient to put their tongue ? roof of the mouth
What will happen if the tongue is not placed at the roof of the mouth? a radiolucent shadow will appear over the apices of the maxillary anteriors
What can be used to help take a pano of an edentulous patient? cotton rolls
What creates a cone shaped radiopacity on receptor images lead apron artifact, apron was too high or thyroid collar was left on.
What causes the apices of the maxillary teeth to be obscured? the tongue is not placed on the roof of the mouth
What causes the "reverse smile" patients chin is tipped upward
What is the problem of a reverse smile hard palate and floor of nasal cavity are super imposed over roots of max teeth loss of detail in max incisal area max incisors are blurred
what causes the "joker" or exaggerated smile line? patients chin is tipped downward
What is the frankford plane? the line that passes from the top of the ear canal to the outer canthus of the eye
What happens if the teeth are placed too far anterior on bite block? anterior teeth appear skinny, out of focus overlapping pre molars
What happens if the teeth are placed too far posterior on bite block? anterior teeth appear fat and out of focus
What happens if the patient is not centered midsaggitally one side will appear more magnified
What causes the cervical spine to appear as radiopacity in center of film? patient not sitting or standing up straight
Advantages of panos field size simplicity patient cooperation minimal radiation
disadvantages of panos image quality focal trough limitations distortion equipment cost
Created by: kbowman12