Table 1 Comparison of the distributions of nondiagnostic scans and motion-artefact corrupted images between patients and controls for each MRI sequence.

From: Fast 3 T nigral hyperintensity magnetic resonance imaging in Parkinson’s disease

MR sequences

PD (n = 20)

Control (n = 25)

P valuea

Nondiagnostic scans

EPISEG

0 (0%)

0 (0%)

n.a

FLAIR

8 (40%)

8 (32%)

0.755

MEDIC

2 (10%)

6 (24%)

0.269

MAG

8 (40%)

8 (32%)

0.755

SWI

6 (30%)

6 (24%)

0.741

Movement artefacts

EPISEG

19/1/0 (5%)

23/2/0 (8%)

> 0.999

FLAIR

16/1/3 (20%)

21/4/0 (16%)

0.122

MEDIC

13/7/0 (35%)

14/9/2 (44%)

0.667

MAG

12/5/3 (40%)

12/9/4 (52%)

0.778

SWI

11/4/5 (45%)

12/10/3 (52%)

0.287

  1. Data are presented as total number (%) of subjects with nondiagnostic scans and number of subjects with no/moderate/excessive movement artefacts (% of subjects with moderate or excessive movement artefacts).
  2. PD Parkinson’s disease, EPISEG 3D segmented echo-planar imaging, FLAIR 3D fluid-attenuated inversion recovery, MEDIC 3D multi echo data image combination gradient echo, MAG magnitude reconstruction of 3D single-echo fast low angle shot gradient echo, SWI SWI reconstruction of 3D single-echo fast low angle shot gradient echo, n.a. not applicable.
  3. aFisher’s exact test (2-sided exact P value). None of the uncorrected P values survive Benjamini–Hochberg correction for multiple comparisons calculated using q = 0.05 and a total number of comparisons of 5.
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