- posteroanterior (PA) projection
- a radiographic projection in which the central ray goes from the back to the front of the body, with the film at the front.
Medical dictionary. 2011.
posteroanterior (PA) projection
Look at other dictionaries:
projection — 1. A pushing out; an outgrowth or protuberance. 2. The referring of a sensation to the object producing it. 3. A defense mechanism by which a repressed complex in the individual is denied and conceived as belonging to another person, as when… … Medical dictionary
posteroanterior — A term denoting the direction of view or progression, from posterior to anterior, through a part. * * * pos·tero·an·te·ri·or .päs tə rō an tir ē ər adj involving or produced in a direction from the back toward the front (as of the body or an… … Medical dictionary
brow-down projection — a posteroanterior projection of the head with the patient prone … Medical dictionary
Caldwell projection — a posteroanterior projection of the head, used for viewing the frontal and anterior ethmoidal sinuses; the central ray enters the back of the head from a slightly superior angle … Medical dictionary
frontal projection — a radiographic projection in which the central ray is perpendicular to the frontal plane; it may be either anteroposterior or posteroanterior … Medical dictionary
half-axial projection — a radiographic projection of the head with the central ray at an angle to the frontal and medial planes; it may be either anteroposterior or posteroanterior. Called also semiaxial p … Medical dictionary
tunnel projection — a posteroanterior projection in which the knee is flexed 40 to 50 degrees with the patient prone and the foot supported; the central ray is perpendicular to the lower leg for a view of the intercondylar fossa of the femur … Medical dictionary
Towne's projection — a posteroanterior X ray film to show the entire skull and mandible. E. B. Towne (1883 1957), US otolaryngologist … Medical dictionary
Waters' projection — a posteroanterior X ray film to show the maxillae, maxillary sinuses, and zygomatic bones. C. A. Waters (1888 1961), US radiologist … Medical dictionary
Towne's projection — a posteroanterior X ray film to show the entire skull and mandible [B. Towne (1883–1957), US otolaryngologist] … The new mediacal dictionary
