Urologists use a lot of different types of imaging tests to evaluate the kidneys. These include X-rays, CT scans, MRI scans, PET scans, Nuclear scans and Ultrasound. We often get asked “which is the best test, doc”? This is a tough question because each type of test has its specific use as well as advantages and disadvantages. Below, we hope to outline the most important aspects of these tests for your education.