Table 1.

The results of FWHM analysis

Field strength	Resolution/P‐ values	Frontal lobe (%)	Parietal lobe (%)	Occipital lobe (%)	Temporal lobe (%)	Cerebellum (%)	Sub. cortical WM (%)	Sub. cortical GM (%)	Brain stem (%)	Whole brain (%)
1.5T	Low	0.20 (93)	0.18 (92)	0.15 (90)	0.13 (89)	0.14 (90)	0.10 (86)	0.17 (92)	0.14 (90)	0.14 (90)
	Intermediate	0.17 (91)	0.15 (90)	0.10 (86)	0.08 (83)	0.11 (86)	0.08 (81)	0.13 (89)	0.13 (89)	0.10 (86)
	High	0.12 (88)	0.12 (88)	0.08 (83)	0.08 (81)	0.08 (83)	0.07 (81)	0.09 (85)	0.10 (86)	0.08 (83)
	Low vs. inter.	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
	Low vs. high	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
	High vs. inter	<0.001	<0.001	<0.001	<0.001	<0.001	0.997	<0.001	<0.001	<0.001
3T	Low	0.16 (94)	0.12 (92)	0.11 (91)	0.09 (90)	0.06 (85)	0.09 (89)	0.13 (93)	0.11 (92)	0.10 (90)
	Intermediate	0.11 (91)	0.10 (90)	0.07 (87)	0.06 (83)	0.05 (82)	0.05 (82)	0.10 (90)	0.09 (90)	0.07 (86)
	High	0.08 (88)	0.07 (86)	0.05 (82)	0.04 (77)	0.05 (79)	0.04 (78)	0.07 (85)	0.07 (86)	0.05 (81)
	Low vs. inter.	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
	Low vs. high	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
	High vs. inter	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
7T	Low	0.12 (95)	0.07 (92)	0.08 (92)	0.07 (91)	0.05 (88)	0.07 (91)	0.10 (94)	0.08 (92)	0.07 (92)
	Intermediate	0.09 (93)	0.07 (92)	0.05 (88)	0.04 (85)	0.05 (86)	0.04 (84)	0.08 (92)	0.07 (91)	0.05 (88)
	High	0.06 (90)	0.05 (87)	0.03 (82)	0.03 (76)	0.03 (78)	0.02 (74)	0.05 (87)	0.05 (88)	0.03 (81)
	Low vs. inter.	<0.001	0.019	<0.001	<0.001	<0.001	<0.001	<0.001	0.062	<0.001
	Low vs. high	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
	High vs. inter	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
9.4T	Low	0.12 (94)	0.08 (90)	0.07 (88)	0.06 (87)	0.05 (85)	0.05 (83)	0.10 (92)	0.08 (90)	0.06 (88)
	Intermediate	0.10 (92)	0.07 (89)	0.05 (83)	0.04 (80)	0.04 (81)	0.03 (73)	0.08 (90)	0.08 (90)	0.05 (83)
	High	0.07 (88)	0.05 (85)	0.03 (76)	0.03 (70)	0.03 (73)	0.02 (65)	0.05 (84)	0.06 (86)	0.03 (76)
	Low vs. inter.	<0.001	0.040	<0.001	<0.001	<0.001	<0.001	<0.001	0.916	<0.001
	Low vs. high	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
	High vs. inter	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001

The FWHM results of the high and intermediate resolution of all B ₀ fields were down‐sampled to the low spatial resolution to allow pair‐wise comparison. Median FWHM values [ppm] together with fractions attributed to the ΔB ₀ within voxels and P‐values from a comparison of different spatial resolutions for brain sub‐regions as well as whole brain are presented.