Dectris EIGER 2 - 8 Region of Interest (Roi); ROI Mode

8. REGION OF INTEREST (ROI)
8.1. 4M ROI mode
The Region Of Interest (ROI) feature enables the user to read out a reduced area of an EIGER2 X/XE 16M or
EIGER2 X/XE 9M detector at higher frame rates. The ROI mode is also available on the EIGER2 S 16M or EIGER2
S 9M without the increase in frame rate. Refer to the corresponding Technical Specications document for the
ROI frame rate specications.
Information #5
Please consult the API reference for further details concerning the usage of the region of interest
detector conguration parameter (roi_mode).
Information #6
Please consult the Technical Specications for further details about the ROI capability of your
detector.
Figure 8.1: The dierent ROI modes for EIGER2 X 9M (left) and EIGER2 X 16M (right) as seen from the front of the detector.
The ROI mode is disabled by default and the full active area is read out (gure 8.1, grey and blue areas).
Changing the ROI mode to another value (eg. ”4M”, ”4M_left”, ”4M_right”, gure 8.1, blue frame) from the list
of allowed values will cause the detector to only read out the selected modules. In the EIGER2 X/XE detectors
the selected ROI can be read out using an increased frame rate compared to a full detector read out.
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