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aliasing

   Also found in: Dictionary/thesaurus, Legal, Financial, Encyclopedia, Wikipedia 0.01 sec.
aliasing /ali·as·ing/ (a´le-as-ing)
1. introduction of an artifact or error in sampling of a periodic signal when the sampling frequency is too low to capture the signal properly.
2. in pulsed Doppler ultrasonography, an artifact occurring when the velocity of the sampled object is too great for the Doppler frequency to be determined by the system.
3. an artifact occurring in magnetic resonance imaging when a part being examined is larger than the field of view; an image of the area outside the field of view appears as an artifact inside the field of view.

aliasing,
an artifact that is caused by undersampling of signal data in diagnostic imaging.

aliasing
an imaging artefact in Doppler ultrasound, governed by the Nyquist limit, in which the blood flow direction appears to be reversed. An experienced operator can readily distinguish the aliased image from the true image.


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00 Hardcover TK5102 Digital alias-free signal processing (DASP) is a technique for overcoming the problems of aliasing at extended frequency ranges.
The GeForce 7800 GTX also includes new image quality features such as transparency supersampling and multisample antialiasing, which enhances visual quality by removing jagged edges from 3D images, minimizing aliasing, and high dynamic range (HDR) lighting support for delivering next-generation lighting and shadowing effects.
2) Through installation of a filter circuit that protects against aliasing noise in the output of the on-chip measurement circuit, precise output to the chip exterior of frequency spectrum data, which is obtained through prolonged and continuous measurement, is realized.
 
 
 
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