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This monograph, written as a competitive thesis, reviews the embryologic development, anatomic structure and anthropomorphic determinations of the positions of the optic canals. It mentions and comments on the various technic (some 30 in all) employed for making roentgenograms of these structures. The author then presents his own improved technic and recommends it for general use.
In this method a cagelike device is attached to the roentgen ray tube to fit over the patient's head and hold a small film perpendicular to the primary pencil of rays. In operation the patient is seated with the head steadied on a chin support, with the Virchow plane (plane of Reid's line) corresponding to the horizontal plane. The device is placed over the head, and the tube "must be moved in such manner as to annul angles alpha and beta" of the optic canals. These angles are achieved by directing the tube downward
Pfeiffer R. Sobre a radiologia do canal optico. Arch Ophthalmol. 1939;22(4):714–715. doi:10.1001/archopht.1939.00860100200022
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