. 2020 Jul 28;34(2):249–260. doi: 10.1007/s10334-020-00868-y

Table 4.

Magnetization transfer ratio asymmetry (MTR_asym) values as a function of systematically varied B₁ and t_p in 10 healthy volunteers

Offset frequency [ppm]	B₁ (µT)	t_p (ms)	MTRasym (%)	p value
0.9–1.9	0.6	100 200 300	0.37 ± 0.78 0.75 ± 0.65 1.34 ± 1.05	100 vs. 200 ms: < 0.001 100 vs. 300 ms: < 0.001 200 vs. 300 ms: 0.016 0.6 vs. 0.8: 1.0 0.6 vs. 1.0: 0.001 0.8 vs. 1.0: < 0.001
0.8	100 200 300	0.12 ± 0.47 0.71 ± 0.81 1.67 ± 1.35
1.0	100 200 300	0.27 ± 0.78 0.94 ± 1.02 0.49 ± 0.95

Offset frequency [ppm]

B₁ (µT)

t_p (ms)

MTRasym (%)

p value

0.9–1.9

0.6

100

200

300

0.37 ± 0.78

0.75 ± 0.65

1.34 ± 1.05

100 vs. 200 ms: < 0.001

100 vs. 300 ms: < 0.001

200 vs. 300 ms: 0.016

0.6 vs. 0.8:

1.0

0.6 vs. 1.0:

0.001

0.8 vs. 1.0: < 0.001

0.8

100

200

300

0.12 ± 0.47

0.71 ± 0.81

1.67 ± 1.35

1.0

100

200

300

0.27 ± 0.78

0.94 ± 1.02

0.49 ± 0.95

MTR_asym values are given as mean ± standard deviation

Means were compared using a multivariate analysis of variance (MANOVA) followed by a post-hoc Scheffé test

p values < 0.05 were considered significant and are given in bold type