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Recently, digital circuit technology has advanced rapidly. It is applied not only to the common electrical equipment which surrounds us but also to medical devices such as ultrasound diagnostic scanners. Conventional ultrasound diagnostic scanners consist mainly of analog circuitry, whereas current ultrasound diagnostic scanners consist mainly of digital devices such as the digital beamformer, which demonstrates high accuracy and a wide dynamic range. It can also produce two or more ultrasound beams simultaneously. Hitachi Medical Corporation has developed a high-end digital ultrasound scanner. At the same time, two kinds of probes have been developed for monitoring the abdominal and cardiac region by using current simulation technology.