Definition - What does Phased Array Technology mean? Ultrasound beams are used in phased array (PA) ultrasonic equipment, which is considered an advanced method of ultrasonic testing. This technology finds applications in medical science and non-destructive testing. This method is more accurate at finding flaws in manufactured materials such as welds.
A migraine is a medical condition which usually causes a pounding, throbbing headache on one side of the head. The pain may be very bad and hurt so much that a person may have a hard time doing anything. While most people who have migraines get a headache, not everyone does.
Migraines are a deeply painful, often debilitating form of headache. People who experience migraines often require prescription medication or medical treatment to cope with their symptoms. A simple over-the-counter headache pill is rarely effective for treating migraine. Migraines can be episodic or chronic. A typical episodic migraine (EM) can linger for hours. Then, several weeks or even months may pass between migraine episodes. Chronic migraines (CM), on the other hand, last longer and occur more frequently.