Table 2 Pulsatility index (PI) and PI-differences between VENC110 and VENC40, with paired-comparison p-values (P) and correlation coefficients (R) for all measurement locations identified in the VENC110 acquisitions.

From: Arterial-optimized 4D-flow MRI for quantifying flow and pulsatility in venous sinuses and large cerebral veins

Vessel

PI-110

PI-40

PI-DIFF

P

R

N

SSS1

0.60 ± 0.23

0.63 ± 0.27

-0.03 ± 0.21

0.36

0.66

35

SSS2

0.65 ± 0.24

0.60 ± 0.26

0.05 ± 0.21

0.14

0.65

36

SSS3

0.59 ± 0.24

0.55 ± 0.20

0.04 ± 0.15

0.16

0.78

36

SSS4

0.61 ± 0.28

0.57 ± 0.23

0.03 ± 0.16

0.2

0.83

36

STS

0.57 ± 0.22

0.45 ± 0.19

0.12 ± 0.26

0.01b

0.23

36

RTS

0.59 ± 0.24

0.58 ± 0.19

0.01 ± 0.15

0.67

0.77

35

LTS

0.69 ± 0.64

0.76 ± 0.90

-0.07 ± 0.34

0.77np

0.86np

26

OS

0.87 ± 0.20

0.78 ± 0.33

0.10 ± 0.13

N/A

N/A

2

RSIG

0.57 ± 0.19

0.55 ± 0.19

0.02 ± 0.14

0.31

0.73

36

LSIG

0.53 ± 0.23

0.49 ± 0.22

0.04 ± 0.22

0.31

0.54

31

RIJV*

0.78 ± 0.36

0.86 ± 0.46

-0.08 ± 0.42

0.39np

0.72np

30

LIJV*

0.82 ± 0.39

0.71 ± 0.35

0.11 ± 0.37

0.17

0.5

23

GALEN

0.44 ± 0.17

0.43 ± 0.25

0.01 ± 0.29

0.27np

0.04np

35

CORTICAL VEINS

0.57 ± 0.27

0.55 ± 0.29

0.02 ± 0.27

0.49

0.54

66

  1. P-values are from paired t-tests or Wilcoxon signed-rank tests, as appropriate; correlations are Pearson’s r or Spearman’s ρ depending on distributional assumptions.
  2. SSS1: anterior superior sagittal sinus, SSS2: mid superior sagittal sinus, SSS3: posterior superior sagittal sinus, SSS4: distal superior sagittal sinus, STS: straight sinus, RTS: right transverse sinus, LTS: left transverse sinus, RSIG: right sigmoid sinus, LSIG: left sigmoid sinus, RIJV: right internal jugular vein, LIJV: left internal jugular vein, GALEN: vein of Galen, CORTICAL VEINS: Trolard and Labbé veins.
  3. *Analysis made on the 5 most cranial cross sections.
  4. bNon-significant with Bonferroni adjusted p-value.
  5. npNonparametric test value (Signed-rank P-value or Spearman’s ρ).
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