Guy D. Potter

Tomography and Cross Sections of the Ear

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Optic Canal Positioning Device

Abstract The optic canal must De piacea at a right angle to the film for accurate roentgenography. The necessary angle is difficult to achieve without the aid of a positioning device. The authors describe an instrument developed for this purpose and explain the procedure involved in its use.

A Method of Optic Canal Radiography

An alignment device to facilitate taking optic canal radiographs is described. It is designed to be used as an accessory for standard radiographic head units. The device has proven to be an extremely rapid method for the preparation of symmetrically placed optic canal radiographs.