image (redirected from Image (artifact))

image /im·age/ (im´ahj) a picture or concept with likeness to an objective reality.

---

body image  the three-dimensional concept of one's self, recorded in the cortex by perception of everchanging body postures, and constantly changing with them.

false image  that formed by the deviating eye in strabismus.

mirror image  one with right and left relations reversed, as in the reflection of an object in a mirror.

Purkinje-Sanson mirror images  three reflected images of an object seen in observing the pupil of the eye: two on the posterior and anterior surfaces of the lens, one on the anterior surface of the cornea.

motor image  the organized cerebral model of the possible movements of the body.

real image  one formed where the emanating rays are collected, in which the object is pictured as being inverted.

virtual image  a picture from projected light rays that are intercepted before focusing.

---

im·age (mj)

n.

1. An optically formed duplicate or other representative reproduction of an object, especially an optical reproduction of an object formed by a lens or mirror.

2. A mental picture of something not real or present.

3. An exact copy of data in a computer file transferred to another medium.

v.

1. To make or produce a likeness of.

2. To picture something mentally; imagine.

3. To translate photographs or other pictures by computer into numbers that can be transmitted to a remote location and then reconverted into pictures by another computer.

4. To visualize something, as by magnetic resonance imaging.

---

image

the picture reproduced on the x-ray film or by other radioimaging methods such as ultrasonography.

---

image amplifier system

includes amplifer and viewer or television camera and tape player.

image display modes

see ultrasonography, A-mode, B-mode and M-mode.

image formation

exposure of the film to the x-ray beam ionizing radiation or to other radiant energy forms causes ionic changes in the silver bromide crystals in the film emulsion so that it acquires a silver atom. It is the deposition of reduced silver atoms in particles or zones that causes the black zones or foci on the film. The amount of silver deposited depends on the intensity of the initial radiation x-ray exposure.

image intensification

a technique used to increase the brightness of the image while maintaining its sharpness. Used particularly in fluoroscopy and viewing directly or indirectly through a television camera and monitor, cineradiography, videotape or split-film device.

latent image

the invisible picture on the film after it has been exposed to the x-ray beam. It requires exposure to a developer and fixer before the image is visible and permanent.

weak image

said of x-ray films which lack density due to underexposure, too brief period of development, insufficient developer or developer temperature too low.