In physics, the term ultrasound is acoustic energy with frequency above human hearing (20000 hertz), in USG, scanners operate in frequency range of 2 to 18 megahertz its 100 times greater than human hearing. Although ultrasound discovered 12 years earlier than x-rays (1883) but found useful in medical practice much later, us used frist time in 1st world war to detect submarines in deep sea.
Medical ultrasound device consist of following important parts : - Transducer Transmitter pulse generator Compensating amplifiers Control units of focusing Digital processors System of display Sound waves are typically produced by piezoelectric transducer encased in probe (all transducers are made up of ceramic), may be of different mode like: - A mode is simplest, may be used for therapeutic purpose B mode linear array of transducer viewed 2d image M mode- M stand for motion for fluoroscopy…
