· Aju mõõtmed normitakse risttahuka järgi, mis jagatakse omakorda 12-ks ala-risttahukaks. · Talairachi koordinaadistiku piirid vastavad aju piirjoontele: parempoolseimas punktis x=68 mm, vasakpoolseimas x=-68 mm, kõige eesmisem punkt y=70 mm, tagumisem y=-102, ülemisem z=74, alumisem z=-42. Spatial Smoothing · Redusing the noize by spatially smoothing the fMRI data with a Gaussian smoothing kernel with a full width at half maximum (FWHM), that is twice the voxel dimensions. · Smoothing means reassigning each voxel in the image a value that is weighted average voxel value and the values of its neighboring voxels. Temporal filtering · Teatud sagedus vahemiku kustutamine. · Optimaalseks filtreerimis strateegiaks arvatatakse band- pass filtri kasutamine, tähendab signaalid aeglase trendiga, mis ei ületa teatud sageduse väärtuse võetakse välja filtreerimise protsessi käigus.
than light striking the top of the pit. The light reflected from the land is then delayed by 1/2 a wavelength -- an so is exactly out of phase with the light reflected from the pit. These two waves will interfere destructively -- s effectively no light has been reflected. The spacing between pits is equally carefully selected. Recall from basic optics that the image of a beam passi through a round aperture will form a characteristic pattern called an Airy disk. The FWHM (full-width half- maximum) center of the Airy disk pattern is a spot about 1.7 um wide and falls neatly on top of the pit track. T nulls in the Airy pattern are carefully situated to fall on the neighboring pit tracks. This minimizes crosstalk from neighboring pits[3]. D. The optical train -- three beam pick-up The most common optical train in modern CD players is the three beam pick-up, depicted below[4]. The light is emitted by the laser diode and enters a diffraction grating
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