aliasing artifact

aliasing artifact

In MRI, superimposition of a tissue image from outside the field of view on the opposite side of the desired image, usually in the phase-encode direction, due to an inadequate number of phase-encoding measurements for the size of the field of view. Inadequate sampling in the frequency-encoding direction can also cause wraparound or aliasing, but this finding is less common with modern MR equipment.
Synonym(s): wraparound artifact
[L. alias, otherwise, fr. alius, other]
References in periodicals archive ?
The enhanced control of tone also helps avoiding blending or aliasing artifacts.
For example, aliasing artifacts or streaks appear as dark lines that radiate away from sharp corners.
First, conventional color frame rates are too low to show real arterial hemodynamics, with pathology often masked by aliasing artifacts and second, the pulsed Doppler examination is a separate and time consuming process of searching for the optimal signal.
264/AVC performance, faster handling of large quantities of still image files (JPG, TGA, DPX, and others), and a Gaussian blur filter to apply better quality blurring and to prevent Moire pattern aliasing artifacts.
Up to 8x FSAA dramatically reduces visual aliasing artifacts or "jaggies" at resolutions up to 1920x1200, resulting in highly realistic scenes.
This binning of pixels maintains field of view (FOV) while reducing aliasing artifacts and improving low-light video performance.
3Dlabs SuperScene(TM) antialiasing: True, multisampled scene-mode antialiasing eliminates "stair-step" edges and distracting aliasing artifacts.