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.
MIGRAINE HEADACHES. Migraine headaches are a type of headache that causes moderate to severe pain that is worsened by light, noise, and motion. Some people also experience nausea and vomiting. Migraine headaches typically last for a few hours, but may last for as long as three days. Migraines are discussed in detail in a separate article.