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 ?
However there are loads and devices on the system that have nonlinear characteristic which is affected both voltage and current signal and result in harmonic distortion causing poor power quality.
Formalisation of the process for identifying one or more of these distortions and additional support to EU SME sectors in this regard;
In this paper, the technique is used for lens distortion model evaluation.
First, SSP unifies a visual perception based model, so it partially avoids the individual differences between observers on different distortions with different levels.
892) reflects that the cognitive distortions scale has high homogeneity and Split half reliability is.
The presence of metallic sources, such as dental implants, orthodontic braces and metallic dental crowns may reduce the image quality of MRI in the maxillofacial region causing large magnetic field distortion and signal loss.
In the literature survey, it is reported that 50% of the architectural distortion cases is missed [2][3], and very few research papers for AD detection have been published [4][7] and very few reliable AD detection systems have been implemented or reported due to its difficulty to detect and to verify.
We notice that unlike the distortions in (11) and (12), this generalized distortion has four parameters that can be calibrated from data just like the [alpha] parameter in Wang's distortion (11) and the [alpha] and k parameters in (12).
Yet the most challenging environment for electronic compasses is transitory magnetic field distortion encountered in everyday situations.
Instead, difficulty was manipulated by changing the number of dots involved in the dot distortions (hereafter referred to as dot count).
Lacking this primary relationship, boys will, depending on their socio-economic class, either "gather together among themselves" and develop a reactive distortion of masculinity that exults violence, or turn into "wimpy, indecisive" young men.
Indeed, we believe that there are other areas (such as goodwill) where distortions may occur that would benefit from similar rules.