Ultrasonic matching layer and transducer

An ultrasonic transducer and matching layer technology, which can be used in sound-producing equipment, ultrasonic/sonic/infrasonic diagnosis, instruments, etc., and can solve problems such as difficult imaging.

Active Publication Date: 2009-05-27
VISUALSONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rat models are difficult to image at high frequencies compared to mouse models because rats have highly attenuated and echogenic epidermis, dermis, and subcutaneous tissue

Method used

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  • Ultrasonic matching layer and transducer
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  • Ultrasonic matching layer and transducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Example 1: Exemplary LiNb 20MHz to 25MHz Transducer with TPX Lens Laminate Manufacturing

[0085] 5 is a block diagram illustrating an exemplary method of fabricating an exemplary LiNb 20MHz to 25MHz transducer with a TPX lens. The fabrication process is described below in three exemplary sections. First, the fabrication of matching and piezoelectric layers to form a stack is described. Second, the fabrication of the lens layer and cyanoacrylate matching layer is described. Finally, the process of bonding the lens and cyanoacrylate layer to the transducer stack is described.

[0086] Fabrication of matching and piezoelectric layers

[0087] Lithium niobate crystals are prepared for the piezoelectric layer, as shown in block 504 . A 36 degree Y-cut LiNb crystal was lapped to a thickness of 0.4λ at the desired center frequency to compensate for mass loading. The crystal is plated with 3000 Angstroms of gold using suitable means such as electron beam deposition ...

Embodiment 2

[0129] Example 2: For an exemplary broadband (85% to 95% of -6dB bandwidth) general high-frequency design of lithium niobate transducer

[0130] Table 1 shows the different layers that make up an exemplary transducer stack. This stack design can be used for transducers with center frequencies from 20 MHz to over 60 MHz.

[0131] Select the design center frequency f D , making it higher than the desired operating center frequency of the device f 0 , to compensate for mass loading that lowers the center frequency of the device. f D is the frequency at which the device operates in air without a lens and an air backing. For this exemplary design, f D is chosen to be approximately 1.15 to 1.25 times the desired center frequency of the final transducer. For example, for a 20MHz device, given the relationship shown in Table 1, one would choose f D = about 23MHz to 25MHz.

[0132] Table 1:

[0133]

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PUM

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Abstract

In one aspect, matching layers for an ultrasonic transducer stack having a matching layer comprising a matrix material loaded with a plurality of micron-sized and nano-sized particles. In another aspect, the matrix material is loaded with a plurality of heavy and light particles. In another aspect, an ultrasound transducer stack comprises a piezoelectric layer and at least one matching layer. In one aspect, the matching layer comprises a composite material comprising a matrix material loaded with a plurality of micron-sized and nano-sized particles. In a further aspect, the composite material can also comprise a matrix material loaded with a plurality of heavy and light particles. In a further aspect, a matching layer can also comprise cyanoacrylate.

Description

Background technique [0001] Small animal imaging is an important area of ​​research in many disciplines, including preclinical drug development, developmental biology, cardiac research, and molecular biology. Several small animal models have been widely used in these fields, the most popular being mice and rats. High frequency ultrasound has been widely used to image mouse models at frequencies from about 20 megahertz (MHz) to over 60 MHz. However, rat models are difficult to image at high frequencies compared to mouse models because rats have highly attenuated and echogenic epidermis, dermis, and subcutaneous tissue. Contents of the invention [0002] In one aspect, a matching layer for an ultrasound transducer stack having multiple layers is provided. A matching layer may comprise a composite material comprising a matrix material loaded with micro-sized and nano-sized particles. In another aspect, the composite material can also include a matrix material loaded with hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/14
CPCG10K11/02H01L41/083B06B1/067B32B7/12A61B8/4209Y10T156/10Y10T428/31855H10N30/50G10K9/122B06B1/06B06B3/00G10K11/30
Inventor N·C·查格瑞斯J·梅希D·赫森
Owner VISUALSONICS
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