Module Detail Information

Name:3D FWHM
Type: Module
Short URL:
Description:This program estimates the Filter Width Half Maximum (FWHM). INPUT FILE RECOMMENDATIONS: For FMRI statistical purposes, you DO NOT want the FWHM to reflect the spatial structure of the underlying anatomy. Rather, you want the FWHM to reflect the spatial structure of the noise. This means that the input dataset should not have anatomical structure. One good form of input is the output of '3dDeconvolve -errts', which is the residuals left over after the GLM fitted signal model is subtracted out from each voxel's time series. If you don't want to go to that trouble, use the output of 3dDetrend for the same purpose. But just giving a raw EPI dataset to this program will produce un-useful values. INPUT DATASET NAMES ------------------- This program accepts datasets that are modified on input according to the following schemes: 'r1+orig[3..5]' {sub-brick selector} 'r1+orig<100..200>' {sub-range selector} 'r1+orig[3..5]<100..200>' {both selectors} '3dcalc( -a r1+orig -b r2+orig -expr 0.5*(a+b) )' {calculation} For the gruesome details, see the output of 'afni -help'.
Input Parameters:
 - Input Dataset
 - Mask
 - Quiet
 - Compatible
Output Parameters:
 - Output
File size:37.06 KB
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