Table 2.
Different linewidth inclusion filtering on frontal lobe data: effects on % retained voxel (%rv), standard error of regression (SE) and their ratio F = 100* SE/rv. SL slab shimmed; WB whole brain shimmed.
| %rv1 | <18Hz | <15Hz | <12Hz | <9Hz |
|---|---|---|---|---|
| 4.8min SL | 92.4±3.9 | 85.3±7.4 | 73.4±10.3 | 48.5±10.9 |
| 6.0min SL | 96.2±2.6 | 90.2±5.0 | 76.8±8.5 | 52.9±11.1 |
| 9.6min SL | 96.5±2.7 | 91.6±4.9 | 80.7±8.9 | 54.3±11.4 |
| 9.6min WB | 92.6±4.1 | 84.4±7.6 | 70.0±6.4 | 45.7±9.3 |
| SE | ||||
| 4.8min SL | 0.087±0.018* | 0.081±0.012 | 0.074±0.010 | 0.064±0.009 |
| 6.0min SL | 0.080±0.027 | 0.073±0.02 | 0.063±0.015 | 0.055±0.014 |
| 9.6min SL | 0.065±0.015* | 0.063±0.014 | 0.054±0.006 | 0.048±0.005 |
| 9.6min WB | 0.071±0.017 | 0.063±0.010 | 0.054±0.005 | 0.045±0.006 |
| F = 100* SE/rv | ||||
| 4.8min SL | 9.5±2.2* | 9.7±2.1 | 10.5±2.5* | 14.5±5.8 |
| 6.0min SL | 8.4±3.0 | 8.2±2.6 | 8.4±3.7 | 11.6±5.9 |
| 9.6min SL | 6.8±1.6* | 6.9±1.7 | 6.9±1.3* | 9.5±3.1 |
| 9.6min WB | 7.7±2.1 | 7.6±1.8 | 7.8±1.2 | 10.4±2.9 |
1
%retained voxels referenced to voxel counts thresholded on 40% tissue fraction. Significance testing: paired t-tests between 4.8 and 9.6 min acquisitions,
*
two tailed p<0.05.