Orbit - Optic Canal (Foramen) (Rhese Method)

Radiographic Positioning

Adult

Other related pages of interest Applied Radiography Radiographic Anatomy Radiographic Protocols

Name of projection	Orbit - Optic Canal (Foramen) (Rhese Method)
Area Covered	Optic canal and non distorted view of optic foramen
Pathology shown	Bony abnormalities of optic foramen
Radiographic Anatomy
IR Size & Orientation	18 x 24cm Landscape
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 perpendicular to IR Centred to downside orbit
Collimation	Four sides of collimation Collimate to size of orbit approximately 10cm x 10cm
Markers	Superior Marker orientation PA
Shielding	Gonadal (check your department's policy guidelines)
Respiration	Suspended
Positioning	The patient should be seated, facing the upright bucky Patients chin, cheek and nose against bucky surface Adjust head so that the midsagittal plane forms a 53° angle with IR Position acanthiomeatal line perpendicular to plane of IR Centred to downside orbit
Critique PACEMAN	Positioning Area Covered Collimation Exposure
Special Notes