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Method and apparatus for transducer excitation in medical ultrasound imaging

An ultrasound imaging system and transducer technology, applied in the field of medical ultrasound imaging systems, can solve problems such as high sampling rate, achieve high power efficiency, maintain programmability, and low cost

Active Publication Date: 2010-03-24
SUPERTEX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increased number of alternations in the waveform results in higher sampling rates, and generally more complex transmit beamformers

Method used

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  • Method and apparatus for transducer excitation in medical ultrasound imaging
  • Method and apparatus for transducer excitation in medical ultrasound imaging
  • Method and apparatus for transducer excitation in medical ultrasound imaging

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Embodiment Construction

[0037] The following sections will first discuss a modified sequence of ultrasound transmissions representing a staircase approximation of the cosine of the Gaussian modulation, and will then discuss the different transmitters used to generate such signals.

[0038] transmit waveform

[0039] Generally, to generate a pulse width modulated (PWM) transmit sequence, the envelope of the amplitude modulated waveform is first sampled at multiple points. The number of sampling points depends on the sampling frequency Fs and the duration T of the envelope E . Preferably, Fs=M·T E , where M is the number of samples. Lowering the value of M results in fewer pulses in the PWM transmit burst and generally makes the transmit beamformer less complex. In any case, the width of each pulse is proportional to the magnitude of the envelope at the sampling point. Thus, the pulse duration increases smoothly to a maximum value and then decreases smoothly, like the amplitude of the envelope.

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Abstract

A method of transducer excitation in medical ultrasound imaging. Based on a stepped approximation of Gaussian modulated cosines, the transmit waveform provides bandlimited spectrum and low level of second order harmonics while retaining the duration of the transmitting within two carrier cycles. The waveform is constructed as a linear composition of four unipolar, rectangle pulses of unity amplitude. Furthermore, the described embodiment supports digitally controlled transmit apodization and focusing.

Description

[0001] related application [0002] This application for patent claims the benefit of U.S. Provisional Patent Application No. 60 / 920,606, filed March 29, 2007, in the name of Lazar A. Shifrin, entitled "Method and Apparatus for Transducer Excitation in Medical Ultrasound Imaging," hereby identified as It is incorporated by reference in its entirety. technical field [0003] The present invention relates to medical ultrasound imaging systems, and in particular phased array scanners operating in different scan formats and imaging modes, and characteristics of ultrasound transmit pulses and transmit pulse generators for such scanners. Background technique [0004] Typically, the characteristics of the emitted pulses are associated with a particular imaging modality. For example, pulse duration is adjusted depending on whether the scanner is operating in B-mode, pulsed wave (PW) Doppler, or color flow imaging. Likewise, the center frequency of the pulse is set according to th...

Claims

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Application Information

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IPC IPC(8): A61B8/00A61B8/14
CPCG01S7/52046G10K11/346G01S15/895
Inventor S·A·拉扎
Owner SUPERTEX INC