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Device for forming a plurality of focused ultrasound foci at spatially specified locations

A technology of specifying a position and focusing ultrasound, which is applied in ultrasound therapy, treatment, etc., can solve problems such as complex calculations, and achieve the effect of simple calculation methods, convenient control, and uniform ultrasonic heating in a large area

Active Publication Date: 2019-01-04
SHANGHAI SHENDE MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for calculating phase control include pseudo-inverse matrix method, genetic algorithm, etc., but these methods are relatively complicated to calculate, especially when calculating the phase signal that forms a large-scale ultrasonic focus at an unnatural focus position in space, it is necessary to be specific to the algorithm Only by comprehensively considering the input, initial conditions and other parameters can a better result be obtained.

Method used

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  • Device for forming a plurality of focused ultrasound foci at spatially specified locations
  • Device for forming a plurality of focused ultrasound foci at spatially specified locations
  • Device for forming a plurality of focused ultrasound foci at spatially specified locations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Such as Figure 1-Figure 3 As shown, taking a 64-array element transducer as an example, the working process of the device for forming a variety of focused ultrasonic focal points in a specified position in space of the present invention is described:

[0061] 1. Calculate the polar coordinate value of each transducer array element in the polar coordinate with the center of the disc base as the origin;

[0062] 2. According to the coordinate values ​​of each array element, the array elements are divided into multiple groups, and there are multiple division methods. This embodiment is described according to one of the following three situations:

[0063] a) Evenly divided into 6 sets of fan-shaped areas, named areas 1 to 6 (it can also be divided into integer groups such as 4, 8, etc., here we take 6 groups as an example);

[0064] b) Firstly, it is divided into 6 groups of fan-shaped areas, and then divided into 2 ring-shaped areas, which are named 1o~6o (outer circle)...

Embodiment 2

[0073] In this embodiment, the initial phase value generation device only divides each array element on the transducer into a plurality of annular areas, and in each annular area, the calculation is performed according to the actual polar coordinate value of the array element, and each The values ​​of M may be different for each of the regions while still maintaining a different initial phase value difference ψ between each annular region. In this case, the ultrasonic focal point will show a spiral ribbon shape according to the M value difference between each ring, and the initial position of the spiral can be obtained by superimposing a same angle value θ on the initial phase value of each array element offset to effect change. Therefore, during the ultrasonic irradiation process, θ can be continuously transformed offset The rotation of the focal sound field around the central axis of the focal point can be realized, so as to achieve the purpose of heating the tissue in the ...

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Abstract

The invention relates to a device for forming a plurality of focused ultrasound foci at spatially specified locations. The device comprises an initial phase value generating device for calculating andobtaining initial phase values of each transducer array element in the multi-element phase control transducer, the initial phase values controlling the size of the focus formed; a deflection phase value generating device for obtaining deflection phase values of each transducer array element by using a pseudo-inverse matrix algorithm or by calculating according to the spatial geometric relationship between the spatially specified position and each transducer array element, and the deflection phase value controls the position formed by the focus; a phase superimposing device for superimposing the initial phase values and the deflection phase values to obtain a final phase signal of each transducer array element; an ultrasonic focus forming device for controlling the transducer array elements to generate ultrasound according to the final phase signal and forming a size-controllable ultrasonic focus at a spatially specified position.

Description

technical field [0001] The invention relates to the technical field of high-intensity focused ultrasound, in particular to a device for forming multiple focused ultrasound focuses at specified positions in space. Background technique [0002] High-intensity focused ultrasound technology is based on the biological effects of ultrasound, usually thermal effects. By concentrating ultrasound energy on a point in the human body, a high temperature that deforms tissue proteins is generated at this point, thereby non-invasively treating human solid tumors. For the treatment of uterine fibroids, breast tumors, liver tumors and other diseases. In traditional high-intensity focused ultrasound, the size of the ultrasonic focus formed by using a single-array element transducer is relatively small, usually 1 mm in diameter and 5-8 mm in length. If ultrasonic thermal ablation is performed on a large solid tumor, it is necessary to combine mechanical movement so that the smaller ultrasoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N7/02
CPCA61N7/02A61N2007/0004A61N2007/027
Inventor 乔杉吴昊刘文杰苏志强张胜发马锐锋
Owner SHANGHAI SHENDE MEDICAL TECH CO LTD