| Vx | vertex |
|---|---|
| AL | angiographic area of lateral projection |
| ALAO | angiographic area of left anterior oblique projection |
| ARAO | angiographic area of right anterior oblique projection |
| ESP | early systolic paradox; echo spacing; effective sensory projection; effective systolic pressure; end... |
| AP projection | The alternative frontal radiographic projection, used mainly in bedside or portable radiography. Synonym: anteroposterior projection. (05 Mar 2000) |
|---|---|
| axial projection | Radiographic projection devised to obtain direct visualization of the base of the skull. Synonym: axial view, base projection, submental vertex projection, submentovertical projection, verticosubmental view. (05 Mar 2000) |
| base projection | Radiographic projection devised to obtain direct visualization of the base of the skull. Synonym: axial view, base projection, submental vertex projection, submentovertical projection, verticosubmental view. (05 Mar 2000) |
| Caldwell projection | Inclined PA radiographic projection devised to permit visualization of orbital structures unobstructed by the petrous ridges. Synonym: Caldwell view. (05 Mar 2000) |
| radiography, dual-energy scanned projection | A method of producing a high-quality scan by digitizing and subtracting the images produced by high- and low-energy X-rays. (12 Dec 1998) |
| PA projection | The standard frontal chest film projection; radiographic skull projection with the petrous ridge superimposed on the orbits. Synonym: posteroanterior projection. (05 Mar 2000) |
| visual projection | A perceptual synthesis involving visual mechanisms. (05 Mar 2000) |
| Rhese projection | Oblique radiographic view of the skull to show the optic foramen. (05 Mar 2000) |
| Granger projection | G. View, reversed half-axial view; uncommonly used PA view of the skull. (05 Mar 2000) |
| Waters' projection | A PA radiographic view of the skull made with the orbitomeatal line at an angle of 37 |
| point projection | <microscopy> A method of producing enlarged images by means of X rays. The specimen is placed close to a point source of X rays and the magnification achieved is the ratio of source-image to source-object distance. Resolution depends primarily on the diameter of the source. (05 Aug 1998) |
| cross-table lateral projection | <radiology> Lateral projection radiography of a supine subject using a horizontal X-ray beam. (05 Mar 2000) |
| posteroanterior projection | The standard frontal chest film projection; radiographic skull projection with the petrous ridge superimposed on the orbits. Synonym: posteroanterior projection. (05 Mar 2000) |
| half-axial projection | Reverse tilted AP radiographic projection devised to permit demonstration of the entire occipital bone, foramen magnum, and dorsum sellae, as well as the petrous ridges. Synonym: half axial view, half-axial projection, Towne view. (05 Mar 2000) |
| projection | 1. The act of throwing or shooting forward. 2. A jutting out; also, a part jutting out, as of a building; an extension beyond something else. 3. The act of scheming or planning; also, that which is planned; contrivance; design; plan. 4. The representation of something; delineation; plan; especially, the representation of any object on a perspective plane, or such a delineation as would result were the chief points of the object thrown forward upon the plane, each in the direction of a line drawn through it from a given point of sight, or central point; as, the projection of a sphere. The several kinds of projection differ according to the assumed point of sight and plane of projection in each. 5. <geography> Any method of representing the surface of the earth upon a plane. Conical projection, a mode of representing the sphere, the spherical surface being projected upon the surface of a cone tangent to the sphere, the point of sight being at the center of the sphere. Cylindric projection, a mode of representing the sphere, the spherical surface being projected upon the surface of a cylinder touching the sphere, the point of sight being at the center of the sphere. Globular, Gnomonic, Orthographic, projection,etc. See Globular, Gnomonic, etc. Mercator's projection, a mode of representing the sphere in which the meridians are drawn parallel to each other, and the parallels of latitude are straight lines whose distance from each other increases with their distance from the equator, so that at all places the degrees of latitude and longitude have to each other the same ratio as on the sphere itself. Oblique projection, a projection made by parallel lines drawn from every point of a figure and meeting the plane of projection obliquely. Polar projection, a projection of the sphere in which the point of sight is at the center, and the plane of projection passes through one of the polar circles. <geometry> Powder of projection, the foot of a perpendicular to the plane drawn through the point. Projection of a straight line of a plane, the straight line of the plane connecting the feet of the perpendiculars let fall from the extremities of the given line. Synonym: See Protuberance. Origin: L. Projectio: cf. F. Projection. Source: Websters Dictionary (01 Mar 1998) |