Brinks Hofer Gilson & Lione
Medical diagnostic ultrasound imaging method and system using simultaneously transmitted ultrasound beams
 A multifocus ultrasonic imaging system transmits two or more successive multifocus beams in order to increase the number of separate focal zones along a given scan line. The operating conditions for different transmit foci are controlled in a multifocus transmit event in order to optimize the operating conditions for each transmit focus and to reduce the unwanted transmit foci interference. In one example, two consecutive multifocus transmit events are transmitted and the transmit focal zones of the first and second transmit events are interleaved in range, thereby increasing the separation between transmit focal zones within a single transmit event. 
Acuson Corporation
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Mirsaid Seyed Albert Kutay F. Ching-Hua
Bolorforosh Gee Ustuner Chou