What is a transcranial doppler ultrasound (TCD)? TCD is a non-invasive ultrasound method used to examine the blood circulation within the brain.  During TCD, sound waves, inaudible to the human ear, are transmitted through the tissues of the skull. These sound waves reflect off blood cells moving within the blood vessels, allowing the radiologist to calculate their speed. The sound waves are... READ MORE

Nerve Conduction Velocity (NCV) and Electromyography (EMG) are tests your doctor may order to measure nerve conduction and muscle action potential. These tests are performed to determine if symptoms (e.g. sciatica, weakness) are caused by a nerve or muscle disorder. Both tests may be performed. A NCV assesses how well a specific nerve conducts impulses by evaluating the speed of an impulse as... READ MORE

What are evoked potentials? Evoked potentials are used to measure the electrical activity in certain areas of the brain and spinal cord. Electrical activity is produced by stimulation of specific sensory nerve pathways. These tests are used in combination with other diagnostic tests to assist in the diagnosis of neurological disorders. Evoked potentials test and record how quickly and... READ MORE

Abdominal ultrasonography (also called abdominal ultrasound imaging or abdominal sonography) is a form of medical ultrasonography (medical application of ultrasound technology) to visualise abdominal anatomical structures. It uses transmission and reflection of ultrasound waves to visualise internal organs through the abdominal wall (with the help of gel which helps transmission of the sound... READ MORE