Question about how to extract backscattering coefficient

Dear all,
I just want to figure out how to extract backscattering coefficient(BC) from RadarSat-2 product. In my opinion, BC is the DN values after the radiometric calibration, is that right? And should I extract BC using pixel extraction tool? If so, how should I set the parameters in this tool?

Actually, all you need is to apply the radiometric calibration on your intial product. You find it in the menu under radar > radiometric > calibration

It converts your DN / Intensity values to Sigma0 (the bacscattering coefficient).#

If you want to read values at specific pixels, the extract pixels tool is the correct way to do it, but you can also use the pin manager ( starting at about 2:00 minutes)

thank you so much! I got it.