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 and hormones are closely linked. The International Headache Society describes Pure Menstrual Migraine as migraine attacks that start two days before or three days after the start of the menstrual cycle. Several studies show that between 4 percent and 21 percent of women have menstrual migraine.