Mandible - Orthopantomogram (OPG)

From wikiRadiography
Jump to navigation Jump to search

Radiographic Positioning

Other related pages of interest

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
Film / Screen Combination Regular
(CR and DR as recommended by manufacturer)
Bucky / Grid No
Filter No
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
  • 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

Area Covered
Special Notes