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what does a panoramic film show?
a wide view of the upper and lower jaws on one film
T/F the panoramic film is used to supplement bitewing and selected periapical films
the purpose of the pano film is to evaluate _________ teeth, _________, _________ ________, growth and development.
It detects _______, lesions and conditions of the ____, and examine the extent of large _______.
- eruption patterns
T/F images on a pano are sharper than intraoral films
the pano should not be used to evaluate and diagnose _______, _________ disease, or _________ lesions
T/F a pano can be used as a substitute for intraoral films
T/F the tubehead of a pano machine moves in one direction around the patients head and the film moves in the opposite direction.
What is tomography and what does it do?
tomo = section. it allows imaging of one layer or section of the body and blurs images from structures in other planes = shape of the dental arches
name the three rotation centers
- double-center rotation
- triple-center rotation
- moving-center rotation
what is the rotation center?
the pivotal point or axis around which the cassette carrier and x-ray tubehead rotate
focal trough " ". what is it?
- "image layer"
- three dimensional curved zone in which structures are clearly demonstrated on a pano.
- the structures positioned inside or outside of the focal trough appear blurred or indistinct and are not visible on the pano
what three pieces of equipment are used for a pano x-ray unit?
- screen film
- intensifying screen
what are the main components of the pano unit?
- x-ray tubehead
- head positioner
- exposure controls
T/F pano units may differ in the number of rotation centers, size and shape of the focal trough, and the type of film transport mechanism used.
T/F the pano x-ray tubehead is similar to an intraoral tubehead; filaments produce electrons, and a target produces x-rays.
T/F the collimator in the x-ray tubehead is similar to the one in the intraoral tubehead
the collimator in the pano unit is the shape of what
- a narrow vertical slit
- the x-ray beam = narrow band
- the beam passes through the patient, to the film through another vertical slit in the cassette carrier
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