of related projections
of an anatomical structure required for right
angle viewing or a general survey of the anatomical part to be demonstrated.
a. Methodology Named After Individual. The method is the procedure for
positioning the patient, the film, and the CR. In some cases, individuals who have
developed a method for demonstrating a specific anatomic part are recognized by
having the method named after them. For example, a PA projection of the cranium
uses the Caldwell method for demonstrating the frontal ethmoid sinuses (figure 3-28).
method: a procedure for positioning the body in reference to anatomic landmarks, film
position, and central ray to body position.
Figure 3-28. Posteroanterior projection of the cranium using the Caldwell method for
demonstrating the frontal and ethmoid sinuses.
b. The Author or Originator May Name the Position. In some cases, the
author or originator of the method for positioning the patient, film, and CR also names
the position that the patient assumes. Thus, for the Chassard-Lapine method, the
patient assumes the Chassard-Lapine position in which the patient sits well back on the
side of the table with thighs abducted (moved away from the central axis) as shown in
figure 3-29. In the case of the Caldwell method, however, the author's name has not
come to stand for the body position that the parent assumes. You will learn which body
positions are named for the author of the method as you start to use these positions in
your day-to-day work.