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Overview of CSF geometry and waveform. a1 Mid-sagittal T2-weighted MR image of NHP. a2 Manually segmented CSF spaces obtained from MRI scans including idealized ventricular system and nerve roots. a3 Visualization of the 3D printed model. b1 Plot showing CSF waveform measured at C2-C3 using cardiac gated PC-MRI. b2 The derived respiratory component from measurements in humans. b3 The final waveform used as input is obtained by superimposing both cardiac and respiration components
