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Table 1 Defined groups based on IVIM DWI protocol with different b-value distribution in brain

From: Can the low and high b-value distribution influence the pseudodiffusion parameter derived from IVIM DWI in normal brain?

Group

Low b value distribution (s/mm2)

High b value distribution (s/mm2)

L1

0, 50, 150, 200

same high b value distribution:

300, 500, 800, 1000

with NEX of 2,2,2 and 2, respectively

L2

0, 30, 50, 100, 200

L3

0, 30, 60, 90, 120, 150, 180, 200

L3_1

0, 30, 60, 90, 120, 150, 180, 200

L4

0, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200

L3_L

0, 30, 60, 90, 120, 150, 180, 200

H1

same low b value distribution:

0, 30, 60, 90, 120, 150, 180, 200

with NEX of 2,2,2,2,2,4,4 and 6, respectively

300, 500, 800

H2

300, 500, 800, 1000

H3

300, 500, 800, 1000, 1500

H4

300, 500, 800, 1000, 1500, 2000

H5

300, 500, 800, 1000, 1500, 2000, 3000

H6

300, 500, 800, 1000, 1500, 2000, 3000, 3500

  1. Group L3_1: Low b value distribution with a NEX of 1 for each low b-value. Group L3_L: Obtain the IVIM parameters by placing the ROI in left frontal lobe based on the data of Group L3