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Table 3 Statistical results from exploratory measurements beyond the protocol.

From: Sequence optimization to reduce velocity offsets in cardiovascular magnetic resonance volume flow quantification - A multi-vendor study

Siemens sample 1 sample 2 sample 3
   transv. aortic obl. aortic pulm transv. aortic obl. aortic pulm transv. aortic obl. aortic pulm
gradient amplitude cm/s per mT/m 0.02 0.05 0.04 0.01 0.03 0.03 0.04 0.11 0.07
slew rate cm/s per mT/m/s 2.28 0.85 -0.86 2.23 1.23 0.14 0.85 -0.34 0.3
r2   0.57 0.49 0.47 0.66 0.73 0.61 0.81 0.89 0.81
  1. Results from beyond protocol variation by multiple regression of gradient amplitude and slew rate on velocity offset. All correlations found were highly significant (P < < 0.01) but not very strong and varied considerably among scanner samples of the same type. As an example, the data points of sample 2 are shown in Figure 5.