phantom image


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image

 [im´ahj]
a picture or concept with more or less likeness to an objective reality.
body image see body image.
digital image a depiction recorded electronically to allow viewing or transmission on a computer.
image distributor beam splitter.
disturbed body image a nursing diagnosis defined as confusion in the mental picture of one's personal self. See also body image.
fluoroscopic image a visual depiction on a fluoroscopy screen.
image intensifier a fluoroscope that is electronically enhanced to produce a brighter image; see also automatic brightness control, brightness gain, and vignetting.
latent image the invisible change in radiographic film that is caused by x-radiation or light and is made visible by development of the film.
magnification image direct radiographic enlargement requiring a fractional focus tube of 0.3 mm or less.
manifest image the change on an x-ray film that becomes visible when the latent image undergoes appropriate chemical processing.
mirror image
1. the image of light made visible by the reflecting surface of the cornea and lens when illuminated through the slit lamp.
2. an image with right and left relations reversed, as in the reflection of an object in a mirror.
motor image the organized cerebral model of the possible movements of the body.
phantom image an artifact seen in conventional linear tomography.

phantom image

an image that appears in a CT scan but is not actually in the focal plane. It is created by the incomplete blurring or fusion of the blurred margins of some structures characteristic of the type of tomographic motion used.
References in periodicals archive ?
Opinion is always false opinion, the phantom image of complete wisdom.
The atomicity of things, which runs through the second part of the Theaetetus, seems to be more in accordance with what Theaetetus knows than the doubleness of things, which Theaetetus was induced to accept from Socrates' delivery of his phantom image.
The effect of the Theaetetus has been to convince Theaetetus that any solution to the problem of knowledge is pseudowisdom, but he has been convinced without ever gaining anything but a phantom image of the true problem and by taking Socrates for the sophist.
The Stranger succeeds in clearing the way for the silent return of Socrates by getting rid of the two phantom images of Socrates, the logic-chopper and the moralist, to which he assigns the names "sophist" and "statesman.
Phantom images in speech thus seem to be a difficulty of the Stranger's own creation, so that whereas he has to face the problem of image-making in speech, the sophist does not, since the sophist after all does not have to accept the Stranger's picture of himself.
To evaluate base + fog, an additional measurement of density must be made either of a shielded portion of the phantom image film or of an unexposed film.
Conducting the weekly phantom image test at facilities with intermittent mammography operation.
It is recommended that a phantom image be made and read each time a new control box is opened.
A phantom image is made and read following the same procedure described previously for the medical physicist survey.
The GAO report also focused on the results from a standardized test of image quality known as the phantom image test.
Changes in the phantom image indicate that one or more of the components in the imaging chain are falling short of the quality standards.
Our evaluation was based on a set of phantom images consisting of discretized realizations of a Boolean model, which were independently sampled.