Reading images
20 images presented for each scanner, and the 0.3% contrast details scored for visibility
Users allowed to select window level and width
Written criteria for visibility of objects
- ‘The criteria for visibility of a detail is whether the observer is sure that there is an object visible against the background. This does not mean that they need to be able to see a circle, but it must be plain that what they are seeing is not just image noise patterns.’
Lighting and monitor set up controlled