Effect on Contrast and Visibility

Thin slices and Noise

• Narrow slices are noisier than thicker ones - less photons get to detectors (for the same mAs / dose setting)

Noise ?

Thin slices and contrast

• Narrower slices have greater contrast if object is smaller than slice thickness

Contrast ?

Optimum situation occurs when z-sensitivity is equal to object z size

Previous slide

Next slide

Back to first slide

View graphic version