Table 1. Time-to-peak and valley for different duration breath holds.
5 seconds | 10 seconds | 15 seconds | 20 seconds | 25 seconds | |
---|---|---|---|---|---|
Time-to-peak | 8.6±0.9 | 7.6±1.0 | 7.7±1.2 | 7.4±1.2 | 6.9±1.0 |
Time-to-valley | 8.3±1.2 | 11.7±1.2 | 11.9±1.6 | 10.8±1.8 | 10.5±1.6 |
Time-to-peak and time-to-valley in seconds for different duration breath holds with a 30mm Hg target intrathoracic pressure. To normalize for different duration breath holds, time-to-peaks are the time from the end of each breath hold, while time-to-valleys are from the start of each breath hold. Values are mean±standard deviation values across subjects for voxels within the cortical gray-matter ROI.