distortion


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distortion

 [dis-tor´shun]
1. the state of being twisted out of a natural or normal shape or position.
2. in psychology, the process of altering or disguising unconscious ideas or impulses so that they become acceptable to the conscious mind.
3. in optics or radiology, deviation of an image from the true outline or shape of an object or structure; it may be a change in size or shape, an elongation, a foreshortening, or a magnification. See illustration.
A, Barrel distortion; B, pincushion distortion. From Dorland's, 2000.

dis·tor·tion

(dis-tōr'shŭn),
1. psychiatry a defense mechanism that helps to repress or disguise unacceptable thoughts.
2. dentistry permanent deformation of the impression material after the registration of an imprint.
3. A twisting out of normal shape or form.
4. ophthalmology unequal magnification over a field of view.
[L. distortio, fr. dis-torqueo, to wrench apart]

distortion

/dis·tor·tion/ (dis-tor´shun)
1. the state of being twisted out of normal shape or position.
2. in psychiatry, the conversion of material offensive to the superego into acceptable form.
3. deviation of an image from the true outline or shape of an object or structure.
Enlarge picture
(A), Barrel distortion; (B), pincushion distortion.

distortion

(dĭ-stôr′shən)
n.
Psychology The modification of unconscious impulses into forms acceptable by conscious or dreaming perception.

dis·tor′tion·al, dis·tor′tion·ar′y, dis·tor′tive adj.

distortion

[distôr′shən]
Etymology: L, dis + torquere, to twist
1 (in psychology) the process of shifting experience in one's perceptions. Distortions represent personal constructs of truth, validity, and right and wrong. The distortions of patients tend to influence their views of the world and themselves, as by altering a negative perception to one more favorable.
2 (in radiology) radiographic image artifacts that may be caused by variations in the size and shape or position of the object. Thick or curved objects cause greater distortion than thin, flat objects because of unequal magnification.

dis·tor·tion

(dis-tōr'shŭn)
1. psychiatry A defense mechanism that helps to repress or disguise unacceptable thoughts.
2. dentistry The permanent deformation of the impression material after the registration of an imprint.
3. A twisting out of normal shape or form.
4. ophthalmology Unequal magnification over a field of view.
[L. distortio, fr. dis-torqueo, to wrench apart]

distortion

Aberration of an optical system resulting in an image which does not conform to the shape of the object, somewhat resembling the image viewed through a cylindrical lens. This is due to an unequal magnification of the image. Distortion can be barrel-shaped (barrel-shaped distortion) in which the corners of the image of a square are closer to the centre than the middle part of the sides; or pincushion (pincushion distortion) in which the corners of the image of a square are farther from the centre than the middle part of the sides (Fig. D10). Example of barrel-shaped distortion: a square object seen through an uncorrected negative spectacle lens. Example of pincushion distortion: a square object seen through an uncorrected positive spectacle lens. See correction; fisheye lens; sine condition.
Fig. D10 Distortion (O, object; A, pincushion distortion; B, barrel-shaped distortion)enlarge picture
Fig. D10 Distortion (O, object; A, pincushion distortion; B, barrel-shaped distortion)

dis·tor·tion

(dis-tōr'shŭn)
1. In dentistry, permanent deformation of the impression material after the registration of an imprint.
2. A twisting out of normal shape or form.
[L. distortio, fr. dis-torqueo, to wrench apart]

distortion,

n 1. a deviation from the normal shape or condition.
n 2. a modification of the speech sound in some way so that the acoustic result only approximates the standard sound and is not accurate.
n 3. a twisting or deformation. A loss of accuracy in reproduction of cavity form.
distortion, film-fault,
n an imperfection in the size or shape of a film image by either magnification, elongation, or foreshortening.
distortion, horizontal,
n a disproportional change in size and shape of the image in the horizontal plane as a result of oblique horizontal angulation of the radiographic beam.
distortion, magnification,
n a proportional enlargement of a radiographic image. It is always present to some degree in oral radiography but is minimized with extended focal-film distances.
distortion, vertical (foreshortening),
n a disproportional change in size, either elongation or foreshortening, caused by incorrect vertical angulation or improper film placement.

distortion

the state of being twisted out of normal shape or position.

Patient discussion about distortion

Q. what does c4-5 mild central disk bulging impinging upon cervical cord without spinal stenosis or distortion of the cord . mild righ neural foraminal narrowing from uncovertebral joint hypertropy mean

A. Well this basically means there is a very small narrowing of the cervical (your neck area) spinal canal (where the spinal cord is), however the narrowing does not cause any damage to the spinal cord, therefore probably does not cause any major symptoms involving the nerves. The c4-5 bulging part refers to the part in between the two cervical vertebras c4 and c5, in which the disc (a part in the spinal cord) is sliding a bit side-ways, but again, it does not seem to be causing any trouble.

More discussions about distortion
References in periodicals archive ?
14-16] Finally, it is accepted that otoacoustic emissions are modified by stimulation of the efferent auditory system, as contralateral acoustic stimuli reduce distortion product and evoked emissions.
Instead of succumbing to memory distortion, volunteers actually improved their recall of "The War of the Ghosts" and another story when given a second memory test shortly after the first, the scientists reported in the June 1992 Psychological Science.
To presume that these finding are indicative of product actually on the market is a gross distortion and just not true.
The program objectives include optimizing residual stress distribution in castings at ambient temperature, minimizing distortion and shrinkage of castings to prevent cold cracking, and predicting critical areas for hot tearing and crack formation in permanent molds or dies.
Direct connection to measurement instrumentation is required for optimum performance of calibrations because it avoids the possible gain and distortion errors that can be induced by intermediate amplifiers.
Theia reinforces its track record of innovation with the widest, no distortion megapixel lens available on the market today with the ability to capture high resolution images in both day and at night without having to re-focus the camera.
PUCB cores made from silica sand have the tendency to produce casting defects due to hot distortion errors.
A NIST scientist working with staff from Ohio University, examined how time-base distortion causes nonlinear distortion of the electrical waveforms measured by digital sampling instruments, such as digital voltmeters and multimeters, sampling waveform recorders and oscilloscopes.
Distortion products were accepted by the system as valid because the response fell within the range of [+ or -]3 standard deviations of noise and [less than]80 dB of stimulus level.
By measuring the distortion, his British colleagues have obtained a preliminary estimate of the overall density of matter in the universe.
But "Shadowless Heart" is a great song: slow, cool, disturbing, knowing, near death, like Social Distortion without the blood and guts--without the distortion.
TEI believes the immediate recognition of such exchange gain or loss, which is attributable to dramatic exchange movements over a period of years, is improper because of the significant distortion that arises from the inclusion and because the approach overrides the recognition triggering principles of sections 987 and 986(c).

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