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Enhanced ultrasound imaging probes using flexure mode piezoelectric transducers

A piezoelectric transducer, piezoelectric ultrasonic technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, fluids using vibration, ultrasonic/sonic waves/infrasonic wave diagnosis, etc., can solve the problem of large array element size and high-density integration Impossible and other issues

Inactive Publication Date: 2013-10-30
RES TRIANGLE INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this typically requires solder bumping, which is a higher temperature process (around 300°C), and high density integration is not feasible due to the large size of the array elements (minimum 200-300 micron pitch)

Method used

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  • Enhanced ultrasound imaging probes using flexure mode piezoelectric transducers
  • Enhanced ultrasound imaging probes using flexure mode piezoelectric transducers
  • Enhanced ultrasound imaging probes using flexure mode piezoelectric transducers

Examples

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example

[0102] The method of generating an enhanced received signal from an ultrasonic piezoelectric transducer is further described with reference to the following examples.

[0103] A single pMUT element experiences a DC bias from -20Vdc to +20Vdc. The acoustic signal provided by a separate piston transducer is directed towards the pMUT element. The signal received by the pMUT element is measured as a function of the applied DC bias. refer to figure 1 , which shows a graph depicting the peak-to-peak received signal (in mV) versus bias voltage. figure 1 The data for , represent the output response of the pMUT element for different levels of DC bias. The DC bias goes from 0V to +20V, back to 0V, and then from 0V to -20V. The received signal (mV) is recorded at each DC bias increment. figure 1 It is shown that, in this particular piezoelectric film, the optimal DC bias for the coercive field level increases the receiver sensitivity. When the DC bias is close to the coercive volta...

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Abstract

A method of generating an enhanced receive signal from a piezoelectric ultrasound transducer is described. The method comprises providing a piezoelectric ultrasound transducer comprising a piezoelectric element operable in flexural mode, receiving a acoustic signal by the piezoelectric element, applying a DC bias to the piezoelectric element prior to receiving the acoustic signal and / or concurrently with receiving the acoustic signal, and generating an enhanced receive signal from the piezoelectric element as a result of receiving the acoustic signal by the piezoelectric element. pMUT-based imaging probes using the above method are also described.

Description

technical field [0001] The present invention relates to a method of generating an enhanced flexure mode signal by a piezoelectric transducer and an ultrasound imaging probe using the method. Background technique [0002] Ultrasound transducers are particularly useful for non-invasive as well as in vivo medical diagnostic imaging. Conventional ultrasound transducers are typically fabricated from piezoelectric ceramic materials such as lead zirconate titanate (PZT) or PZT polymer composites, which are sliced ​​or laser cut to form arrays arranged in one or two dimensions multiple individual components. Acoustic lenses, matching layers, backing layers, and electrical interconnects (eg flex cables, metal pins / wires) are typically attached to each transducer element to form a transducer assembly or probe. The probes are then connected to the control circuitry with a harness or cable containing individual wires that drive and receive signals from each individual component. An i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B8/14G01N29/24
CPCA61B8/4488B06B1/0622A61B8/12A61B8/4438A61B8/445A61B8/14G01N29/24
Inventor D·道施O·冯拉姆J·卡斯泰卢奇
Owner RES TRIANGLE INST