The easiest of easy Osirix plugins, which also happens to show you how to get all ROIs for the current series.
alexwhittemore/ROI-Counter
Simple Osirix plugin which happens to count the number of ROIs in the current series.
Objective-C
Simple Osirix plugin which happens to count the number of ROIs in the current series.
Objective-C
The easiest of easy Osirix plugins, which also happens to show you how to get all ROIs for the current series.