posteroanterlor (PA) projection: a projection of the X-ray beam from a
projection: to an anterior surface.
proximal: refers to parts nearest the center, midline, or trunk; near the
beginning or source.
radiograph: an X-ray film containing an image of an anatomical structure.
radiographic examination: encompasses positioning the anatomical structure
(body part), exposing, and processing the film.
recumbent: lying down or reclining.
of related projections
of an anatomical structure, required for
right angle viewing or a general survey of the anatomical part to be
scale: see "contrast."
of secondary radiation created
when the radiation has
been deviated in direction during passage through thick body parts.
source-to-image receptor distance (SID): distance in inches between the
X-ray tube focal spot and the film; also referred to as: anode-film distance and
focal spot-film distance.
straight central ray: the principal beam of rays emanating from the X-ray tube
forms a 90 angle with the film; may be horizontal perpendicular or vertical
superior: situated farther up, farther from the bottom of base position; also the
upper surface of an organ or structure. See "cephalic."
suspended expiration: patient is instructed to take a deep breath, blow it all the
way out, and then hold it out.
suspended inspiration: the patient is told to take a deep breath and hold it.
suspended respiration: the patient is instructed to stop breathing.