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 ?
He does, however, practice a phantom image of Socrates' daring: for a time he gives up what he knows.
Yes, as usual there is no discrete center channel, even with the solo-vocal material, but the phantom image holds up well.
The Stranger admits to Theatetus that insofar as Theaetetus cannot tell Socrates apart from a sophist, the Stranger's sixth division vindicates Socrates' view (231a4-b2) that the sophist; is a phantom image of the true philosopher, and that Theaetetus, mistake is necessary.
ACR accreditation programs provide an objective, peer reviewed assessment of facilities through evaluation of personnel qualifications, equipment requirements, quality assurance and quality control procedures, and evaluation of clinical and phantom image quality.
Fortunately, the engineers did a fine job of maintaining a tight phantom image, although much of the success involves the nicely towed-in Dunlavy Cantatas in my middle system.
As usual, there is no discrete center channel, but the phantom image is tight and well focussed from the sweet spot, and even a bit away from that location if the speakers are toed in enough to deliver a good time/intensity tradeoff.
The evaluated phantom image should closely approximate clinically acceptable images.