Zygomas - Arches (OM)

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24 x 30cm
PortraitRadiographic Positioning

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Name of projection Zygomas - Arches (OM)
Area Covered
Pathology shown
Radiographic Anatomy Facial Bones Radiographic Anatomy
IR Size & Orientation 24 x 30cm
Film / Screen Combination Regular
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or Stationary Grid
Filter No
Exposure 75 kVp
20 mAs
FFD / SID 100cm
Central Ray CR angled 23° to 38° caudal.
CR enters the vertex midway between the zygomatic arches.
Collimation Collimate closely to outer margins of the skull
Markers Inferior and Lateral
Marker orientation PA
Shielding Gonadal (check your department's policy guidelines)
Respiration Suspend
  • The patient should be seated, facing the upright bucky.
  • Rest the tip of the nose and chin on the upright bucky
  • The median sagital plane should be perpendicular to the cassette, this is done by checking the external audiatory meatuses and the outer canthi of the eyes
  • CR angled 23° to 38° caudal
  • CR enters the vertex midway between the zygomatic arches.

Area Covered
Special Notes