Diagnostic Procedures

Accurate evaluation and diagnosis of neurological problems require sophisticated medical knowledge. Greenwich Hospital neurologists are highly skilled in the use of advanced techniques to reach a proper diagnosis.

After a complete medical history and physical examination, patients may undergo diagnostic tests appropriate for their condition. Following are among the tests offered at Greenwich Hospital:

Arteriogram (angiogram)

Arteries and veins are x-rayed to detect blockage or narrowing of the vessels.

Cerebral Angiography

Contrast material, or dye, is injected and then followed by an x-ray to visualize blood flow through the brain.

Computed tomography scan (CT or CAT scan)

A combination of x-rays and computer technology creates highly detailed images of any part of the body, including the bones, muscles, fat, and organs.

Electrodiagnostic Tests

These help diagnose disorders of the muscles and neurons.

Electromyography (EMG)

A needle placed in the muscle records and analyzes the electrical activity in the muscle.

Nerve Conduction Velocity (NCV)

Surface electrodes attached to the body measure the speed of electrical signals through a nerve to diagnose and evaluate nerve damage.

Electroencephalography/Electroencephalogram (EEG)

Electrodes attached to the scalp record the brain's continuous electrical activity.

Evoked Potential Tests

Procedures that use electrodes taped to the head to measure and record the brain's electrical response to visual, auditory and sensory stimuli.

Lumbar Puncture (Spinal Tap)

A needle placed into the spinal canal measures the pressure around the spinal cord and brain. A small amount of cerebral spinal fluid may be extracted to test for infection or other problems.

Magnetic Resonance Imaging (MRI)

A procedure that uses a magnetic field and pulses of radio wave energy to create pictures of organs and structures inside the body.


Dye injected into the spinal canal makes the structure clearly visible on x-rays.

Positron Emission Tomography (PET)

A material called “radiotracer” is injected, inhaled or swallowed to help evaluate cell activity and determine how well organs and tissues are functioning.

Ultrasound (Sonography)

High-frequency sound waves and a computer create images of blood vessels, tissues, and organs.