Distribution And Strength Of The Sound In The Human Head

The treatment methods of human head diseases often cause great concern in medical research. At present, ultrasound has been applied to the treatment of the human head diseases and has effective results. However, the sound field in intracranial with sound wave spread in the human head is still a lack of complete and reliable information. It is dangerous and difficult to test and measure on human head directly. Therefore, it is necessary to use the finite element methods(FEM) to simulate and research the distribution and intensity of the sound field in the human head to promote the development of ultrasound in the treatment of disease in human head.The main work of this research is summarized as follows:1. After consulting the basic dimensions and material parameters, we abandoned the traditional engineering modeling method and use the three-dimensional animation modeling software 3ds Max to create basic geometric model of the human head, and unify the adjacent similar tissues based on maximum approximate human anatomy model.2. Import the geometry model of human head into the finite element calculation software COMSOL Multiphysics successfully, and then pre-process the model, set the physical field, add the material parameters, set the boundary conditions and grid division, and eventually transformed the geometry model into a finite element model successfully.3. Add the external excitation to the finite element model of human head, change the excitation conditions, and calculate the sound field in intracranial and skull stress with the different excitation frequency, excitation location and excitation amplitude, and different model size.4. Combine with the practical application and clinical data to analyze and discuss the results obtained from the calculation. We found that the spread of sound in human head is through the vibration of skull, ultrasonic therapies are very useful in the treatment of the disease related to the brain near the skull, and it is unreasonable to apply the ultrasonic conditions obtained from animals to human beings or those from adults to children directly.This research method avoids the unwanted damage caused by experiments on the human head directly, and obtains the corresponding conclusions from the data of sound field distribution and intensity in the simulation. It can provide a theoretical basis for the application of the ultrasound in the treatment of human head diseases.