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. 2019 Mar 20;9(6):e3195. doi: 10.21769/BioProtoc.3195

Figure 18. Freehand selections tool on ImageJ.

Figure 18.

The freehand selection tool (circled in red) can be used to trace a region of interest around a platelet or platelet aggregate. The region of interest can then be stored on the ROI manager, and the parameters, set in Step B3, can be measured.