How to select multiple regions in an image

I have a medical image and i need to select multiple regions(2 or 3)on it and process these differently. Plz tell me how to do this.

Answer 1

[Image Analyst]

You could use image processing. Maybe imfreehand(), roipoly(), thresholding, or an infinite number of other image segmentation methods. That's about all we can say, given what you've provided so far.