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

(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.

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]

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 ?
The digitized force signals were sent to a PC using a USB chassis (NI cDAQ-9174) and low pass filtered by a distortionless phase 20th-order Butterworth filter with a cutoff frequency of 150 Hz.
Figure 6 shows that all beam patterns have nulls in the interference signals and maintain a distortionless response for the SOI.
MLE Maximum Likelihood Estimator IMP Iterative Multiple Parameter EM Estimate Maximize AP Alternate Projection MAP Maximum a posteriori ASPECT Adaptive Signal Parameter Estimation & Classification Technique MODE Method of DOA Estimate AAR Adaptive Angular Response TNA Thermal Noise Algorithm MVDR Minimum Variance Distortionless Response MEM Maximum Entropy Method MUSIC Multiple Signal Classification NSP MUSIC Noise Space Projection MUSIC Root MUSIC Polynomial Rooting MUSIC Cyclic MUSIC Cyclostationary MUSIC WSF Weighted Subspace Fitting MNM Minimum Norm Method ESPRIT Estimation of Signal Parameters via Rotational Invariance TLS-ESPRIT Total Least Squares ESPRIT PRO-ESPRIT Procrustes ESPRIT DPT Discrete Polynomial Transform CM Constant Modulus
Zhuang, "Sourcelocalization with minimum variance distortionless response for spherical microphone arrays," Journal of Shanghai University, vol.
One of the most commonly used adaptive beamformers is the minimum variance distortionless response (MVDR) algorithm.
Abbreviations: [CC.sub.50], the concentration to inhibit Hep G2.2.15 cell proliferation by 50%; DEPT, distortionless enhancement by polarization transfer; DMEM, Dulbecco's modified Eagle's medium; DMSO, dimethyl sulfoxide; ELISA, enzyme-linked immunosorbent assay; HBeAg, hepatitis B e antigen; HBsAg, hepatitis B surface antigen; HBV, hepatitis B virus; HMBC, [sup.1]H detected heternuclear multiple bond correlation; HMQC, [sup.1]H detected heternuclear multiple quantum coherence; [IC.sub.50], 50% inhibition concentration against HBV synthesis; MTT, methyl thiazolyl tetrazolium; NOESY, nuclear Overhauser enhancement spectroscopy; SI, selectivity index; TLC, thin layer chromatography.
Darzi, "Minimum variance distortionless response (MVDR) beamformer with enhanced nulling level control via dynamic mutated artificial immune system," The Scientific World Journal, vol.
The output SINRs of them under the perfect (the correlation matrices are known) and imperfect (the correlation matrices are estimated by finite samples) situations are examined and compared with those of the narrowband minimum variance distortionless response (MVDR) and broadband TDL beamformers.
In contrast, coding [4], partial transmit sequence (PTS) [5][6] and selected mapping (SLM) [7] are distortionless techniques.
For the well-known Capon beamformer or minimum power distortionless response (MPDR) beamformer, the adaptive weights are calculated by minimizing the beamformer's output power subject to the constraint that forces the array to make a constant response in the steering direction [1-3].
The minimum variance distortionless response (MVDR) beamformer assumes the desired signal induced into the array from the normal direction, so that all the elements receive the same desired signal without any phase difference [2, 8].
Abbreviations: DEPT, distortionless enhancement by polarizationtransfer; COSY, correlation spectroscopy; bw, body weight; AST, alkaline phosphatase; ALT, alanine transaminase; AST, aspartate transaminase; T BIL, total bilirubin; TP, total protein; TG, triglycerides; HDL, high density lipoprotein; LDL, low density lipoprotein.