Article Figures & Data
Figures
- Fig 1.
A, Slice positioning of the quantitative phase-contrast angiography measurements. Each slab was acquired twice, first with a velocity-encoding of 40 cm/s to visualize venous outflow and then with 100 cm/s to resolve arterial inflow. B, Placement of the measurement ROIs to measure flow properties in the superior sagittal sinus (red circle) and the straight sinus (green circle) with the corresponding measurement points in 1 R-R interval.
- Fig 2.
Example of the flow measurements (carotid arteries) of 1 patient showing no difference before and after LP (left). On the venous measurements of the SSS (right), a change in flow can be observed.
Tables
- Table 1:
Results of flow measurements, RI, and PI in the intracranial vasculature of n = 20 patients and n = 20 controlsa
Vessel Parameter Patients Controls Pre-/Post-LP (P Value) Pre-LP/Controls (P Value) Post-LP/Controls (P Value) Pre-LP Post-LP SSS RI 0.33 (±0.08) 0.26 (±0.13) 0.35 (±0.10) .09 .21 <.04 PI 0.39 (±0.12) 0.31 (±0.16) 0.43 (±0.18) .09 .48 <.04 Flow (mL/min) 454 (±133) 457 (±85) 526 (±119) .86 .08 <.05 IJV Flow (mL/min) 663 (±195) 564 (±216) 653 (±199) <.01 .88 .20 ↵a A full list of results is presented in Tables 2 and 3. Data in columns 3–5 are mean values.
- Table 2:
Results of flow measurements, RI, and PI in the intracranial vasculature of n = 20 patients and n = 20 controlsa
Vessel Patients Controls Pre-LP Post-LP ICA Flow (mL/min) 971 (±222) 969 (±199) 827 (±218) RI 0.67 (±0.09) 0.63 (±0.08) 0.69 (±0.09) PI 1.16 (±0.25) 1.05 (±0.20) 1.23 (±0.31) BA Flow (mL/min) 219 (±87) 236 (±90) 316 (±109) RI 0.66 (±0.10) 0.50 (±0.63) 0.62 (±0.10) PI 1.20 (±0.32) 0.96 (±0.57) 0.99 (±0.20) Total arterial inflow (ICA+BA) Flow (mL/min) 1189 (±235) 1206 (±241) 1143 (±261) SSS Flow (mL/min) 454 (±133) 457 (±85) 526 (±119) RI 0.33 (±0.08) 0.26 (±0.13) 0.35 (±0.10) PI 0.39 (±0.12) 0.31 (±0.16) 0.43 (±0.18) SS Flow (mL/min) 138 (±30) 151 (±68) 143 (±33) RI 0.30 (±0.06) 0.30 (±0.20) 0.31 (±0.08) PI 0.36 (±0.09) 0.35 (±0.24) 0.37 (±0.12) IJV Flow (mL/min) 663 (±195) 564 (±216) 653 (±199) RI 0.47 (±0.14) 0.29 (±0.64) 0.60 (±0.24) PI 0.64 (±0.28) 0.48 (±0.48) 0.96 (±0.59) ↵a Data are mean values of patients and volunteers.
Vessel Pre-/Post-LP (P Value) Pre-LP/Controls (P Value) Post-LP/Controls (P Value) ICA Flow (mL/min) .98 .05 .04 RI .20 .66 .04 PI .17 .50 .04 BA Flow (mL/min) .21 <.01 .02 RI .29 .16 .43 PI .30 .21 .82 Total arterial inflow (ICA+BA) Flow (mL/min) .73 .57 .44 SSS Flow (mL/min) .86 .08 .05 RI .09 .21 .04 PI .09 .48 .04 SS Flow (mL/min) .46 .59 .65 RI .91 .73 .78 PI .90 .79 .78 IJV Flow (mL/min) <.01 .88 .20 RI .25 .04 .05 PI .16 .04 <.01
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