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Panoramic Imaging

Dental Radiography -- Principles and Techniques

TermDefinition
Panoramic Imaging wide view of MX and MD
Purpose eval impacted teeth eval eruption patterns, growth, and development detect disease, lesions, and conditions of jaw extent of large lesions eval trauma
Fundamentals xray tube rotates arounf PT head in one direction while recptor rotates in opposite direction ... creates tomography
Tomography allows imaging of one layer/section of body while blurring images of structures in other planes
Rotation Center Pivotal point or axis around where the receptor and xray tube head rotate
3 Basic Rotation Center 1. dbl center 2. trpl center 3. moving center
Focal Trough theoretical concept used to determine where dental arches must b positioned to obtain clearest image
Vertical Angulation tube head always rotates behind PT head receptor always rotates in front of PT
Head Positioner consists of chin rest, bite-block, forehead rest, and lateral head supports
Film blue- sensitive -- paired w screens that produce blue light green-sensitive -- paired w screens that produce green light
Intensifying Screens -- Calcium Tungstate emit blue light
Intensifying Screens -- Rare Earth -emit green light -require less xray exposure -faster
Cassette device that holds extra-oral films and intensifying screens
Ghost Image -if not all metallic/radiodense objects are not removed -radiopaque artifact seen on pano image
Lead ApronArtifact - occurs if lead apron is improperly placed - radiopaque cone-shaped artifact
Positioning of Lips and Tongue - dark radiolucent shadow that obscures ant teeth - if tongue doesnt remain on palate, dark radiolucent shadow appears
Positioning of Frankfort Plane Upward - chin too high or is tipped up, frankfort plane is angled upward -- results in reverse smile line
Positioning of Frankfort Plane Downward - chin too low or tipped down -- exaggerated smile line
Aligning Teeth Ant to Focal Trough - PT teeth too far forward on bite-block or ant to focal trough - ant teeth appear skinny
Aligning Teeth post to Focal Trough - Pt ant teeth are aligned too far back on bite-block - teeth appear fat
Aligning Midsagittal Plane - PT head not centered - ramus and post teeth appear unequally magnified
Aligning the Spine - PT not standing w spine straight - cervical spine appears as a radiopacity in the center of mage
Advantages of Pano Imaging field size simplicity PT cooperation Min exposure
Disadvantages of Pano Imaging image quality focal trough limitations distortion equpitment cost
Created by: summerbradley