Table 2.

R.m.s. resultant distortion values, d_rms (mm), for three categories of patient: prostate DW image volumes radiologically assessed as having ‘no distortion’ or ‘some distortion’ or patients with hip prostheses incurring the possibility of ‘severe image warping’ due to susceptibility effects.

Distortion (mm)
No distortion			Distortion			Distortion (hip patients)
Study	drms	s.e.m.	Study	drms	s.e.m.	Study	drms	s.e.m.
1	3.456	0.005	11	5.489	0.005	21	6.792	0.009
2	1.936	0.007	12	5.214	0.007	22	12.419	0.008
3	1.864	0.005	13	3.684	0.007	23	8.624	0.008
4	1.635	0.006	14	6.415	0.006	24	4.220	0.009
5	2.097	0.007	15	4.449	0.007	25	4.645	0.006
6	1.821	0.007	16	4.015	0.005	26	14.213	0.006
7	1.926	0.006	17	3.693	0.005	27	16.489	0.009
8	1.206	0.006	18	2.810	0.005	28	4.612	0.009
9	1.750	0.005	19	4.869	0.006	29	4.615	0.008
10	1.734	0.006	20	3.388	0.006	30	4.207	0.006
mean (sd)	1.943 (0.582)		mean (sd)	4.402 (1.098)		mean (sd)	8.083 (4.653)

As in Table 1, the errors are expressed as standard error on the mean and sample standard deviation accordingly.