aliasing

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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

A phenomenon that occurs when digitising less than two samples per period in a periodic function, where the anatomy being imaged by magnetic resonance extends beyond the field of view (FOV). Areas extending beyond the FOV boundaries are aliased back into the image to appear at artefactual locations.

ali·as·ing

(āl'ē-ăs-ing)
Magnetic resonance imaging artifact produced when anatomy outside the field of view is mismapped inside it.

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.
References in periodicals archive ?
1 Billy McCormack The Jaggies 786 2 M Stevenson Martin's Monifieth Afters 770 3 Steve Reilly Reilly's Winners 769 4 Ron Shear Wesley Winners 755 5 Paul Campbell RHRYB 735 6 Charles Thomson Scott the Lot 732 7 Keith Ewen Keith 731 8 Robin Gillespie Beer we go 729 9 Richard Paterson Richard Braveheart 728 10 Graham Campbell Graham Viking 710
All these differences cause flicker, distinct motion judder, and jaggies along diagonal lines.
The result is a reduction in the size of the jaggies on the edges of objects.
The effect of toggling FSAA off and on was not subtle; texture crawl and jaggies were instantly eliminated with FSAA enabled.
We were impressed by the ability of Sage's patented DCDi technology to produce smooth, natural images and eliminate the staircasing and jaggies produced by all other deinterlacing technologies.
We were impressed by the ability of Sage's Directional Correlational Deinterlacing technology to produce smooth, natural images and eliminate the staircasing and jaggies produced by all other deinterlacing technologies.