Microwave thermal ablation temperature field simulation method based on characteristic parameter feedback

Abstract

The invention discloses a microwave thermal ablation temperature field simulation method based on characteristic parameter feedback. The method comprises the steps that preset initial conditions and boundary conditions are set in COMSOL Multiphysics software, and a microwave thermal ablation temperature field simulation model is established; sensitivity analysis is performed on body model organization characteristic parameters based on the simulation model; a microwave thermal ablation experiment is executed, a temperature measurement probe is utilized to perform actual measurement on seven points in an ablation region, and actually measured temperature is obtained; a precise representation form of the characteristic parameters is obtained by use of actually measured data of a feedback probe based on a parameter sensitivity analysis result; and temperature field simulation is performed by use of the precise representation form of the characteristic parameters, and the characteristic parameters are compared with the actually measured data to verify the precision of a temperature field distribution model. By the adoption of the technical scheme, the problem that in the prior art, temperature field distribution cannot be obtained precisely due to uncertainty of the organization characteristic parameters is solved.

Description

technical field [0001] The invention belongs to the technical field of thermal ablation temperature field simulation, and in particular relates to a microwave thermal ablation temperature field simulation method based on characteristic parameter feedback. Background technique [0002] Liver tumors are one of the greatest threats to human life and the second leading cause of death in China. Therefore, effective treatment of liver tumors has become an urgent social problem. Microwave thermal ablation technology has been widely used clinically due to its advantages of minimal invasiveness and remarkable therapeutic effect, and has become an effective method for the treatment of human liver tumors. However, the quality of thermal ablation still mainly depends on the experience of clinicians and lacks objective in accordance with. In clinical operations, 54°C is often used as the boundary threshold for the thermal coagulation zone of liver tumors. Therefore, accurate characteri...

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Problems solved by technology

[0005] Aiming at the problem in the prior art that the temperature field distribution cannot be accurately obtained due to the uncertainty of tissue characteristic parameters, the present invention proposes a microwave thermal ablation temperature field simulation method based on characteristic parameter feedback, through parameter sensitivity analysis and single Accurate characterization of tissue characteristic parameters is obtained based on actual measurement feedback, and then an accurate temperature field model for constant power microwave thermal ablation is obtained through simulation technology

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