ANGIOGRAM - a test to which shows the blood vessels leading to and in the brain by injecting a dye or contrast substance through a catheter placed into the arteries supplying blood to the brain

CT SCAN - (computed tomography scan): A diagnostic imaging technique in which a computer utilizing x-rays creates a three-dimensional map or picture of soft tissue and/or bone.

ELECTROENCEPHALOPGRAHY (EEG) - The study of the electrical currents formed by brain activity; the record made is called an electroencephalogram.

ELECTROMYOGRAPHY (EMG) - A method of recording the electrical currents generated in a muscle during its contraction.

INTRA-ARTERIAL CATHETERIZATION ANGIOGRAPHY - An invasive study in which a catheter (a small tube) is placed in the artery and contrast material is injected to which makes the blood vessels visible on an X-Ray image. The catheter is inserted in the groin into the femoral artery (the artery to the leg) through a needle, and is guided into the arteries in the neck and head.

MAGNETIC RESONANCE ANGIOGRAPHY (MRA) - A non-invasive study which is conducted in a Magnetic Resonance Imager (MRI). A computer utilizes a large magnet to provide an image of the arteries in the head and neck. Contrast material is usually not required.

MAGNETIC RESONANCE IMAGING (MRI) - Diagnostic test that produces three-dimensional images of body structures using powerful magnets and computer technology rather than x-rays.

MYELOGRAM - An x-ray of the spinal canal following injection of a contrast material into the surrounding cerebrospinal fluid spaces.

ULTRASOUND - The use of high-frequency sound waves to create images of internal body structures.

VENTRICULOGRAM - An x-ray study of the ventricles. X-RAY - Application of electromagnetic radiation to produce a film or picture of a bone or soft-tissue area of the body.