Fig. 1

Examples of the method for calculating the quantitative metrics. The metrics for each artefact/image quality issue are defined in Table 2. The size of the ROIs varied between patients in accordance with anatomical differences. Metrics: A—signal to noise ratio; B—anterior thoracic signal loss; C2—susceptibility artefact, length; D—fat suppression; E1—ghosting (brain); E2—ghosting (pelvis); F1—geometric distortion (brain); F2—geometric distortion (pelvis); G—eddy current distortion. Image series: b50—DWI with b-value = 50 smm⁻²; b900—DWI with b-value = 900 smm⁻²; W—Dixon water image