All participants will undergo a Positron Emission Tomography scan, also called a PET scan, before their scheduled surgery. This test studies the function of organs such as the heart, brain, and bone. The test is different from other imaging tests such as x-rays, CT scans, or MRI's because PET images show how tissues function. The other imaging methods show what the tissues look like. The PET scanner is similar to a CT or an MRI scanner. The bed on the scanner moves during the exam so that each area of the body can be imaged. The PET scanner makes no noise.