Table 1 Summary of the cardiac- and respiratory-driven CSF velocities (cm/s) in the cranial and caudal directions for the three different respiratory periods
Respiratory period (s) | Cranial | Caudal | ||
|---|---|---|---|---|
Cardiac | Respiratory | Cardiac | Respiratory | |
Sylvian aqueduct | ||||
 6 | 0.216 ± 0.049 | 0.109 ± 0.025 | −0.219 ± 0.058 | −0.121 ± 0.020 |
 10 | 0.209 ± 0.061 | 0.119 ± 0.016 | −0.212 ± 0.052 | −0.137 ± 0.028 |
 16 | 0.201 ± 0.041 | 0.110 ± 0.031 | −0.205 ± 0.045 | −0.131 ± 0.033 |
Foramen magnum | ||||
 6 | 0.948 ± 0.431 | 0.384 ± 0.194 | −0.976 ± 0.466 | −0.348 ± 0.232 |
 10 | 1.003 ± 0.534 | 0.359 ± 0.178 | −1.028 ± 0.511 | −0.301 ± 0.095 |
 16 | 1.008 ± 0.540 | 0.246 ± 0.095 | −1.008 ± 0.489 | −0.275 ± 0.117 |