Home » Positioning Guide » Rhese Method: Parieto-Orbital oblique Position – Optic Canal (Foramen)

Rhese Method: Parieto-Orbital oblique Position – Optic Canal (Foramen)

Film: 8×10 in (18×24 cm)

Position of Patient:
-Patient in prone or sealed-erect position,
-with arms in the comfortable position
-shoulders lie in the transverse plane.

Position of part:
-Rest the zygoma, nose and chin of the affected at the table center and the cassette.
-AML is perpendicular MSP forms an angle of 53˚ with the plane of film
-If rotation is correct, MSP is parallel to the protractor set to 53˚
-AML position is check with one of the right side of the triangle
-Immobilize head and respiration suspended for the exposure

Central Ray:
Directed perpendicular through the affected orbit closest to the film

Structure shown:
-Optic canal is in cross-section and lying in the inferior and lateral quadrant of orbital shadow.
-Lateral duration indicates incorrect rotation of head
-Longitudinal duration indicates incorrect angulations of AML
-Supra orbital margins lie in the same transverse line
-Both side are examined for comparison

Evaluation Criteria
-Optic canal lie in the inferior and lateral quadrant of the orbit
-Optic canal should be seen enface at end of the sphenoid ridge
-Entire orbital shadow should be included
-Close beam restriction of orbital region is needed


The author is a Radiologic Technologist, currently in the academic field, hoping to mold and produce future Radiologic Technologists who will be theoretically and technologically competent.

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