Well I had to have one of my foot. and they did my entire body while I was there. I thought for me it was an incredible waste of time since I had a stress fracture that was healing. But hopefully yours will show something.
It looks for fractures and other problems that are not easily visible with xrays. I had to go in the morning for the first scan and then in the afternoon after I had dye injected for the second scan. This way they can see any problems.
It is painless.
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BONE SCAN 
Linear Mode
