Table 1 (A) The mean errors in the magnetic field estimates fitted by various orders (1 to 4) of spatial polynomials over the entire EPI gradient waveform at maximal gradient amplitudes of 10, 20, 30 and 40 mT/m. (B) The mean errors in the accumulated phase estimates fitted by various orders (1 to 4) of spatial polynomials over the entire EPI gradient waveform at maximal gradient amplitudes of 10, 20, 30 and 40 mT/m.

From: Decoupled dynamic magnetic field measurements improves diffusion-weighted magnetic resonance images

Order of spatial polynomials 1 2 3 4
Gradient strength
(A) Error in the magnetic field strength estimates
10 mT/m 0.018 0.026 0.033 0.040
20 mT/m 0.034 0.052 0.069 0.084
30 mT/m 0.046 0.069 0.092 0.111
40 mT/m 0.058 0.086 0.115 0.140
(B) Errors in accumulated phase estimates
10 mT/m 0.038 0.041 0.044 0.044
20 mT/m 0.064 0.072 0.079 0.081
30 mT/m 0.088 0.096 0.102 0.105
40 mT/m 0.113 0.121 0.127 0.133