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.
A migraine is a headache with throbbing pain that is usually worse on one side of the head. The pain is often severe enough to hamper daily activities and may last from four hours to three days if untreated. More than one in 10 Americans, including one in 6 women, have migraines, but many have been told mistakenly that they have a sinus or tension headache. Foods, stress, and hormones can be migraine triggers.