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Brain is the collection of supportive tissues and nerve cells like meninges and glial cells. Diagnostic test is to take a brain scan that takes pictures of the brain; similar to X-ray that can see inside the body to diagnose a broken bone, a brain scan can see inside the skull. Two major scans for diagnosing a brain are Computed Tomography (CT) and Magnetic Resonance Imaging (MRI). Brain scans are normally painless and non-invasive. The most difficult part is to sit or lie for a long time and some patients may also need medicines for claustrophobia. Computer Tomography (CT) scan integrates high speed X-ray technology with a computer. CT scanner circles the head, taking scanning every angle. Magnetic Resonance Imaging (MRI) uses magnets and radio waves to generate pictures of the brain tissues. MRI scans create two dimensional or three dimensional pictures of the brain and unlike CT scans, it does not use radiations.