Ultrasonic diagnostic imaging systems for varying depths of field
December 20, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3815409 3898840 3924454 Ultrasonic imaging method and apparatus Ultrasonic beam forming technique Ultrasonic transmitting and receiving devices using dielectric transducers Ultrasonic electronic lens with reduced delay range Ultrasonic body scanner and method Switchable depth of focus pulse-echo ultrasonic-imaging display system Ultrasonic imaging system InventorsAssigneeApplicationNo. 06/451313 filed on 12/20/1982US Classes:73/626, Switched73/599, Attenuation measurement73/625, Having plural sonic type transmitter or receiver transducers73/642Having wave shaping meansExaminersPrimary: Birmiel, Howard A.Attorney, Agent or FirmInternational ClassesG10K 11/34 (20060101)G10K 11/00 (20060101) G10K 11/32 (20060101) G01S 15/00 (20060101) G01S 15/89 (20060101) Foreign Application Priority Data1982-09-27 GBAbstractAn ultrasonic diagnostic imaging system is described in which a multi-element transducer array transmits a focused beam of energy from the transducer elements. As the depth of focus is varied between near and far field focusing under operator control, the nominal frequency of the transmitted ultrasound energy is varied correspondingly by the system, from relatively high frequency transmission in the near field to relatively low frequency transmission in the far field. | |
