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CH. 22
Panoramic Imaging
| Term | Definition |
|---|---|
| Which describes use of panoramic imaging | evaluation of impacted teeth, eruption patterns, growth and development, detection of diseases lesions, condition of jaw, extent of larger lesions and evaluate trauma |
| Zone in which structures are clearly demonstrated on panoramic image is termed | focal trough |
| type of screen and why it’s recommended for panoramic imaging | rare earth intensifying screens because they require less x-ray exposure for patient |
| Why is thyroid collar not recommended in panoramic imaging | it blocks c-ray beam and obscures information |
| Imaging line from bottom of eye socket through top of ear canal | franfort plane |
| When receptor and tube head rotate around patient it’s called | panoramic imaging ONLY |
| Type of image used to examine extent of large lesions | panoramic imaging |
| In panoramic imaging what must be aligned | dental arches and focal trough |
| When collimater is lead plate with opening in shape of a narrow slit (vertical) it’s used for | panoramic imaging |
| When lead collimater is lead plate with small rectangle opening it’s used for | intraoral imaging |
| Vertical angulation in the head is variable in | intraoral imaging |
| Head positioner is used in | panoramic imaging |
| Lead apron with thyroid collar is only used for | intraoral |
| All jewelry must be removed for | both panoramic and intraoral |
| Midsagitsl line must be positioned perpendicular to floor for | panoramic imaging |
| Vertical column must be perfectly straight for | panoramic imaging |
| Equipment and preparations necessary before panoramic imaging | cover bite block with plastic, set exposure factors, adjust machine to height of patient |
| How to discuss preparation necessary before exposure of panoramic projection | explain procedure, place lead apron (low on neck) and have patient remove all objects on upper body |
| Patient positioning steps discussion for panoramic imaging | “sit as tall as possible”, “bite on plastic bite block with top and bottom front teeth”, position midsagital plane (head can’t be tilted only straight), tongue on roof of mouth, tell them remain still while rotating |
| Errors with franfort positioning errors and corrections | patients head is tipped down results in lower MD incisors blurred and loss of dental in anterior apical region, exaggerated smile line (curved upward) |
| Solution | carefully position patient so frankfort plane is parallel cooperation, minimal exposure |
| Advantages of panoramic imaging | field size simplicity, patient cooperation, minimal exposure |
| Disadvantages of panoramic imaging | image quality, focal trough limitations, distortion, equipment cost |
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