Table 2. Subjective scores of image quality characteristics.

Scale and score	Description
Overall image quality
1	Inadequate, no diagnosis of PE possible
2	Low, diagnosis possible until the lobar level
3	Sufficient, diagnosis possible until the segmental level
4	Good, diagnosis possible until the subsegmental level
5	Excellent
Motion artefacts
1	Massive, no diagnosis possible
2	Definite, establishment of diagnosis impeded
3	Moderate, but image sufficient for diagnosis of PE
4	Minor
5	None
Accompanying lung disease
1	Present, lung disease disturbing for CAD and radiologist
2	Present, lung disease disturbing for CAD
3	Present, but no influence
4	None

CAD, computer-assisted detection; PE, pulmonary embolism.