Table 3.

Eddy-Current Amplitudes and Time Constants Determined from 1D Sample Measurement.^a

Gradients		System #1		System #2		System#3
		τ (ms)	Amplitude (%)	τ (ms)	Amplitude (%)	τ (ms)	Amplitude (%)
z → z	fast	0.8 ± 0.1	0.54 ± 0.06	1.89 ± 0.07	0.41 ± 0.03	2.1 ± 0.2	0.026 ± 0.001
	intermediate	6.0 ± 1.3	0.14 ± 0.02	43 ± 8	0.023 ± 0.002	60 ± 11	0.0089 ± 0.0005
	slow	254 ± 8	0.356 ± 0.004	585 ± 259	0.010 ± 0.002	---	---
y → y	fast	0.29 ± 0.07 0.65 ± 0.11	0.35 ± 0.17 0.15 ± 0.04	0.80 ± 0.09	0.21 ± 0.03	0.9 ± 0.1	0.09 ± 0.02
	intermediate	13 ± 2	0.052 ± 0.002	11.4 ± 2.8	0.016 ± 0.002	53 ± 8	0.052 ± 0.008
	slow	210 ± 8	0.150 ± 0.003	314 ± 180	0.0117 ± 0.0009	481 ± 302	0.016 ± 0.008
x → x	fast	---	---	0.89 ± 0.06	0.19 ± 0.02	---	---
	intermediate	---	---	---	---	60 ± 5	0.0294 ± 0.0004
	slow	---	---	---	---	---	---
y → x	fast	---	---	1.5 ± 0.3	0.018 ± 0.002	---	---
z → x	fast	---	---	1.6 ± 0.2	0.037 ± 0.003	---	---
z → y	fast	0.9 ± 0.2	0.04 ± 0.01	---	---	---	---
	slow	293 ± 75	0.017 ± 0.001	---	---	---	---
Bo shifts		τ (ms)	Amplitude (mG/G/cm)	τ (ms)	Amplitude (mG/G/cm)	τ (ms)	Amplitude (mG/G/cm)
z → Bo	fast	2.1 ± 0.1	0.59 ± 0.02	---	---	1.9 ± 1.2	0.18 ± 0.07
	intermediate	205 ± 16	−1.7 ± 0.4	---	---	52 ± 9.9	0.16 ± 0.02
	slow	434 ± 69	1.1 ± 0.4	113 ± 31	0.136 ± 0.005	---	---
y → Bo	fast	1.4 ± 0.3	−0.36 ± 0.02			---	---
	intermediate	14 ± 2	0.75 ± 0.02	13 ± 1	0.117 ± 0.002	56 ± 15	0.089 ± 0.002
	slow	109 ± 6	2.0 ± 0.1	321 ± 36	−0.085 ± 0.005	---	---
x → Bo	intermediate	115.8 ± 0.5	−0.911 ± 0.002	27 ± 4	0.38 ± 0.05	16 ± 5	0.19 ± 0.05
	slow	---	---	210 ± 44	0.26 ± 0.05	94 ± 15	0.35 ± 0.05

^avalues reported as mean ± SD as estimated by Bayesian multi-exponential analysis. Residual gradient amplitudes are reported as a percentage of the test gradient magnitude. B_o shifts (in mG) are normalized by the amplitude of the gradient test pulse in G/cm and are reported in units of mG/G/cm.