Meaning of Cylus: Cylus is a modern English respelling of the name Silas, which is a short form of the Greek name Silouanos, which is a variant of the Latin name Silvanus, which is derived from the Latin word silva, meaning wood, forest.
Overview. A positron emission tomography (PET) scan is a type of nuclear imaging test that shows the metabolic activities (energy usage) of your brain. While X-ray, CT, and MRI scans look at the anatomy of your brain, a PET scan can give your doctor information about how your brain is working.
Types of Brain Scans. Scans generate images of the brain for the purpose of diagnosing tumors. They take the place of x-rays, which do not show tumors located behind the bones of the skull or spine. The most common scans for diagnosis and follow-up are magnetic resonance imaging (MRI) and computerized tomography (CT). Certain types of brain scans use a special dye, called contrast, to help areas of interest show up better. Contrast dye is usually injected into the body before the scan starts. With the exception of those requiring an injection of contrast dye, scans are relatively painlessâlike getting a picture taken.