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Table 1 Largest mean uncorrected velocity offset (cm/s) in regions centred within 50 mm of isocentre for the aortic plane, and within 70 mm for the MPA plane (head-foot or left-right phase-encoding).

From: Flow measurement by cardiovascular magnetic resonance: a multi-centre multi-vendor study of background phase offset errors that can compromise the accuracy of derived regurgitant or shunt flow measurements

cm/s Scanner
Site
Aorta MPA
(HF phase-enc)
MPA
(LR phase-enc)
Scanner type 1 1 -2.2 cm/s -3.8 cm/s -5.6 cm/s
  2 -2.8 -3.1 -5.5
  3 -0.7 -3.2 -5.3
  4 -1.3 -3.5 -4.7
Scanner type 2 5 -2.2 -3.4 -5.4
  6 -1.1 -3.9 -3.1
  7 1.6 -4.0 -3.6
  8 -2.7 -4.9 -4.9
Scanner type 3 9 1.6 1.2 1.8
  10 1.2 -0.7 0.4
  11 0.9 1.6 2.1
  12 1.1 -1.7 2.0
Mean of all 12 absolute values   1.6 cm/s 2.9 cm/s 3.7 cm/s
Range of all 12 absolute values   0.7 to 2.8 cm/s 0.7 to 4.9 cm/s 0.4 to 5.6 cm/s
  1. The twelve rows are from the four sites using each scanner type. The scanner types are not identified.