How to detect edge or contours for Ultrasound Images?

I am working with ultrasound images. The region of interest is detected and i need the edge/contours for lesions. I tried some general techniques such as Sobel, Prewitt, Roberts etc. Any suggestions will be appreciated :)

[Nitin]

Try posting some pictures online, this will give the reader an idea what you are looking for

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

Answer 1

[Image Analyst]

If, as you say, "region of interest is detected" then you've done the hard part already. Now all you need to do is to call bwboundaries() to get the (x,y) coordinate pairs for the perimeter of your detected ROI(s).

[Minhaj Nur Alam]

actually the contour I need is inside the ROI. The image has a lot of speckle and that's why general functions are not working

[Image Analyst]

Yes, speckle is a common problem with ultrasound images.