Systems and methods for localized calibration

A method for updating a uniformity map of a detector, the detector defining a detector surface area, the method comprising:

• positioning a flood on a sub-portion of the detector surface area;
• collecting counts from the flood for the sub-portion of the detector surface area;
• using the counts collected from the flood to make a local uniformity map;
• normalizing the local uniformity map to provide a normalized local uniformity map;
• and
• updating the uniformity map by replacing an adjustment portion of the uniformity map with the normalized local uniformity map.

A system comprising:

• a detector defining a detector surface area;
• a flood configured to be disposed proximate the detector, the flood defining a flood area that is smaller than the detector surface area;
• and
• at least one processor operably coupled to the detector and configured to:
• collect counts from the flood for the sub-portion of the detector surface area;
• and
• update an adjustment portion of a uniformity map for the detector using the counts collected for the sub-portion of the detector surface area.