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

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 ?
Harmonic field measurement is done to verify the degree of severity of harmonic distortion due to domestic non-linear loads in the distribution system [4].
The generation and detection of the harmonics in the source side of the power system and the respective steps to mitigate the effects of harmonic distortions are given.
Harmonic distortion reduction from near 30 percent down to less than three percent
There is some harmonic distortion, but this can be measured with the built-in notch filter.
The device offers single stage primary side regulation with a high power factor and low Total Harmonic Distortion (THD) along with open and short circuit protection.
Harmonic distortion is -20 dBc maximum at 375 W for the 400S1G4 and at 380 W for the 450S1G3.
In addition to standard power measurements, these power meters include inrush current, total harmonic distortion of V/I and energy measurements.
995, low total harmonic distortion (THD) of less than 10 percent and DC bus regulation within a tolerance of [+ or -]2.
Operating at 85 percent efficiency, the devices incorporate active power factor correction to minimize input harmonic distortion, and the switchers accept input from 85V to 264V AC or 120V to 320VDC.