[Short-cone or semi-distancing technic. Substitution for so-called contact projections]

Radiation protection requires that the so-called "on contact" (PARMA) projections be prohibited. They can be replaced by the short cone technique, which provides a sufficient enlargement to eliminate parasitic shadows on the unexamined opposite side, and is indicated for profile radiology of the TMA and profile parotid sialography examinations.