| MAUT | multi-attribute utility theory |
|---|---|
| theor | theory, theoretical |
| TSD | target-skin distance; Tay-Sachs disease; theory of signal detectability |
| HCG, hCG | Human Chorionic Gonadotropin; 사람융모성성선자극호르몬 1. Placental Glycoprotein Hormone &nbs... |
| PPRF | Pontine Paramedian Reticular Formation |
| Abbe flap | A full-thickness flap of the middle portion of the lower lip that is transferred into the upper lip, or vice versa. (05 Mar 2000) |
|---|---|
| Abbe limit | <physics> Ernst Abbe's specification for the limit of resolution of a diffraction-limited micro-scope. According to Abbe, a detail with a particular spacing in the specimen is resolved when the numerical aperture of the objective lens is large enough to capture the first-order diffraction pattern produced by the detail at the wavelength employed. See: Rayleigh criterion, Sparrow limit. (05 Aug 1998) |
| Abbe operation | Use of an Abbe flap in plastic surgery of the lips. (05 Mar 2000) |
| Abbe, Robert | <person> U.S. Surgeon, 1851-1928. See: Abbe flap, Abbe operation. (05 Mar 2000) |
| Abbe's condenser | A system of two or three wide-angle, achromatic, convex and planoconvex lenses that may be moved upward or downward beneath the stage of a microscope, thereby regulating the concentration of light (directly from a bulb or reflected from a mirror) that passes through the material to be examined on the stage. (05 Mar 2000) |
| Abbe's law of limiting resolution | <physics> For a periodic structure of units separated by distance d and obliquely illuminated by the unrefracted ray and one of the two diffracted rays (extremely oblique illumination). Abbe applied the law of diffraction: d = 0.5 lambda /NA, where: lambda = wavelength of the monochromic light or shortest of mixed wavelengths NA = the limiting numerical aperture (NA) of objective or condenser. (05 Aug 1998) |
| Abbe substage apparatus | <apparatus> Includes a rack and pinion for horizontal displacement of an iris diaphragm to obtain oblique lighting. (05 Aug 1998) |
| Abbe test plate | <equipment> A long, wedge-shaped coverslip about 0.20 mm thick at one end and 0.10 to 0.12 mm at the other end coated chemically with a silver film on which are ruled horizontal lines. at each variation in thickness of 0.01 mm there are vertical lines. By means of oblique illumination and by focusing on different portions of the plate, it is possible to determine the optimum coverslip thickness for any objective and also, for microscopes with drawtubes, the tube length for best objective performance. The approximate freedom from spherical and chromatic aberrations can also be estimated. Small isolated bits of silver near the edges of the lines form good objects for the star test (05 Aug 1998) |
| condenser, Abbe | <microscopy> Originally a two-lens substage condenser combination designed by Ernst Abbe. It lacks chromatic correction though designed for a minimum of spherical aberration and has only a very low-angle aplanatic cone. It may be rated with a numerical aperture as high as 1.3. (05 Aug 1998) |
| Ernst Abbe | <person> German mathematician and physicist, professor at Jena, and inventor of much optical apparatus at the Zeiss works. His inventions include the apochromatic objective, the compensating ocular, the Abbe condenser, a well corrected oil-immersion achromatic condenser, the immersion objective, Abbe apertometre, Abbe refractometre, and the drawing camera, he evolved the Abbe theory of resolution and microscope imagery, the numerical aperture formula, and other optical theories. Lived: 1840-1905. (05 Aug 1998) |
| accidental image | Continuation of visual impression after cessation of stimuli causing the original image. (12 Dec 1998) |
| body image | A term for the concept which each individual has of his own body as an object in and bound by space, independently and apart from all other objects. (12 Dec 1998) |
| radiographic image enhancement | Improvement in the quality of an X-ray image by use of an intensifying screen, tube, or filter and by optimum exposure techniques. Digital processing methods are often employed. (12 Dec 1998) |
| radiographic image interpretation, computer-assisted | Computer systems or networks designed to provide radiographic interpretive information. (12 Dec 1998) |
| real image | An image formed by the convergence of the actual rays of light from an object. Synonym: inverted image. (05 Mar 2000) |