Today, I was scheduled for MRIs of my right knee and lumbar spine. I took a percocet tablet abot two hours before and 20mg of valium 30 mintes before the procedure. When positioned for the knee image, I experienced a level10 pain in the knee/leg and was unable to continue. When positioned for the lumbar image, the pain restarted and reached a level 7 or 8 before stropping the procedure. What alternative is available?