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Simulated measurement of heat field distribution in microwave solidification treatment of tumor

A measurement method, microwave technology, applied to measuring devices, measuring heat, and thermometers using electric/magnetic elements that are directly sensitive to heat, etc., can solve the problem that the temperature of the microwave three-dimensional thermal field cannot be measured and known

Inactive Publication Date: 2003-11-05
广东世荣兆业股份有限公司 +1
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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the temperature of the microwave three-dimensional thermal field cannot be measured and known during the process of implantable microwave therapy for tumors, and to provide a simulation measurement method that can obtain the dynamic distribution of the microwave three-dimensional thermal field during microwave therapy to solve the problem Solved the problem of effective thermal field preset before tumor treatment and real-time monitoring during treatment

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  • Simulated measurement of heat field distribution in microwave solidification treatment of tumor
  • Simulated measurement of heat field distribution in microwave solidification treatment of tumor
  • Simulated measurement of heat field distribution in microwave solidification treatment of tumor

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Embodiment Construction

[0021] Here, the microwave coagulation thermal field simulation measurement of liver tumors is taken as an example. The simulation measurement steps of tumor lesions in other tissues are the same, except that the liver phantom is replaced with other tissue phantoms or the pre-test isolated pig liver is replaced with other three-dimensional animals. organize.

[0022] The design idea of ​​the present invention is to use the finite element analysis method to solve the microwave radiation energy (SAR-Specific Absorption Rate) absorbed by the unit (tumor) tissue per unit time, and simulate the dynamic three-dimensional heat treatment of liver tumors by computer simulation of implantable microwave coagulation. field.

[0023] To solve SAR, according to the simplified Pennes equation:

[0024] ρcdT / dt=Qr+KΔT-M b C b (T-T b )=SAR+KΔT-M b C b (T-T b )

[0025] Where: ρ is tissue density (kg / m 3 ), c is the specific heat, T is the temperature, t is the time, K is the thermal c...

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Abstract

The simulated measurement of heat field distribution in microwave solidification treatment of tumor includes the following steps: making microwave radiation field simulating measurer; setting microwave antenna inside the simulating measurer and setting measuring thermocouples connected via data collector to computer in proper positions; setting microwave body mold inside the simulating measurer; measuring temperature varying with time with the thermocouples, substituting the data into biological heat conducting equation to obtain the microwave radiation energy SAR per unit volume and per unittime, substituting SAR into dispersion function equations, solving the simultaneous equations in computer to obtain the coefficients of the dispersion function equations and the 3D heat field dispersion function of microwave radiation as well as the temperature in certain points in certain time.

Description

Technical field: [0001] The invention relates to a measurement method of microwave radiation heat field, in particular to a simulation measurement method of heat field distribution in the process of microwave coagulation treatment for tumors. Background technique: [0002] Implantable microwave hyperthermia has been widely used in interventional therapy of tumors. The effective temperature and heat field formed by microwaves in cancerous tissues is the key to affect the therapeutic effect, that is, the treatment process is judged by the regulation of the temperature field formed by microwaves. At present, the effective temperature thermal field is used in the treatment process by point temperature measurement method, using 1 or 2 points to estimate and control the effective thermal field body of microwave action, or to infer the change of temperature through the change of resistance. These measurements and The judging method cannot obtain accurate and detailed data of the e...

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Application Information

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IPC IPC(8): G01K7/02G06F17/00
Inventor 董宝玮梁萍程志刚于晓玲于德江
Owner 广东世荣兆业股份有限公司
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