Table II.
Quality of estimated independent component maps with different preprocessing options
| Baseline FA | Global subject FA variance | Global spatial FA variance | Total signal variance (25 ICs) | Total noise variance | SNR (variance of 25 ICs/ variance of noise) | |
|---|---|---|---|---|---|---|
| Default settingsa | 0.4377 | 0.0002 | 0.0142 | 0.0272 | 0.0093 | 2.92 |
| Spatial smoothing by 5 mm filter | 0.4336 | 0.0002 | 0.0470 | 0.0569 | 0.0299 | 1.90 |
| No spatial smoothing | 0.4377 | 0.0002 | 0.0558 | 0.1671 | 0.1246 | 1.34 |
| Spatial normalization by minimum deformable subject | 0.4640 | 0.0002 | 0.0109 | 0.0412 | 0.0182 | 2.26 |
a
The default settings consist of spatial normalization using the FMRIB58 template in TBSS as well as spatial smoothing using a 9‐mm FWHM Gaussian filter (see Materials and Methods for details).