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in EBSD explained:

Basics of EBSD

EBSD Experiments

Undertaking Experiments

Sample Preparation

Links to this section:

Point Analysis
Crystal Orientation Mapping
Pattern Quality Maps
Grains
Texture
Phase discrimination
Summary

Types of EBSD experiment

Pattern quality maps

The diffuseness or quality of the diffraction pattern is influenced by a number of factors including local crystalline perfection, sample preparation, surface contamination and the phase and orientation being analysed.

The height of the peaks in the Hough transform gives a measure of the pattern quality.  One algorithm for calculating pattern quality p is:

where h is the peak height of the Hough transform of the i^th most intense Kikuchi band and is the standard deviation of the Hough transform. Pattern quality maps will often reveal features invisible in the electron image such as grains, grain boundaries and surface damage such as scratches (Figure 4). 

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