Magnetic Resonance Imaging

I went for MRI scan the other day for the pain on my left arm and it was diagnosed as supraspinatus tendonitis. In layman's term, it is inflammation of the tendons which join the muscles to the bone. I was inside the machine for like eternity, a wholesome 20 minutes hearing noises. It uses sound waves together with magnetic waves to form images slice by slice. Each slice takes about 2 minutes to form, so imagine the number of images made during the boring 20 minutes of lying down without any movement, other than breathing. The cost? A whopping $800 for the session of which I am going to claim from my one and only insurance company, Prudential. Still going for physiotherapy frequently for faster healing.