| Name of projection | Mandible - Orthopantomogram |
| Area Covered | Single panaoramic image of the teeth, mandible, TMJ's, nasal fossae, maxillary sinus and zygomatic arch |
| Pathology shown | Fractures of mandible, TMJ pathology, caries, tooth alignment |
| Radiographic Anatomy | Mandible Radiographic Anatomy |
| IR Size & Orientation | 25 x 30cm
Landscape |
| Film / Screen Combination | Regular
(CR and DR as recommended by manufacturer) |
| Bucky / Grid | No |
| Filter | No |
| Exposure |
|
| FFD / SID | Fixed (per manufacturers specification) |
| Central Ray | Fixed and directed slightly cephalic to project anatomic structures at the same height on top of one another |
| Collimation | A narrow vertical slit diaphragm is attached to the X-ray tube which provides the collimation |
| Markers | Often built into the cassette (check orientation of cassette before inserting into OPG machine) |
| Shielding | Lead Apron (check your department's policy guidelines) |
| Respiration | Normal breathing |
| Positioning | - Removal all metal, plastic and removable objects (dentures, earrings, hair clips, glasses etc)
- Patient erect or seated
- Guide patient into OPG unit, resting chin on bite block
- Have patient stand in close with spine straight (don't aloow head and neck to stretch foward)
- Adjust chin rest until IOML is aligned parrallel with floor
- Align midsagittal plane with the vertical centre line of the chin rest
- Position bite block between patients front teeth
- Instruct patient to place lips together and position tongue on roof of mouth
- Explain to patient how the tube will rotate around them and the time it will take
|
Critique
| Positioning
Area Covered
Collimation
Exposure
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| Special Notes |
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