HIFU piezo focusing function of concave surface

Views: 12 Author: Site Editor Publish Time: 2018-08-17 Origin: Site

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Taking the simulation model of HIFU for breast tumor as a reference, establishing the additional transducer as shown in the figure .A three-dimensional simulation model of human body is fat or muscle tissue with a certain angle of sound, and is carried out in three dimensions simulation calculation, studying the distribution of sound pressure formed in different calculation angles in the calculation area, the position and size of the focus area has the impact. The calculation area of the simulation model is a cylinder with a diameter of 80mm and a length of 60mm, in which the cylinder is changed.The diameter of the energy device is MN 2 40Inm, its geometric focal length of Hifu piezoelectric ceramic transducer is 35 mm, and its sound is added at 20mm from the transducer.The shaft angles were 900, 760 and 63" body fat and muscle tissue respectively.

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Establishing a three-dimensional simulation model is to analyze and discuss the effects of different functions on the sound field in the focus area of HIFU piezoelectric crystal transducer treatment;Effect of phased parameters on energy density of phased annular is ultrasound focusing in shallow calculation area; HIFU simulation model for treating breast tumors is a reference, and the focal region of the human tissue and the transducer axis is not perpendicular.The influence of position, size and sound pressure distribution has the results are as follows.

Establishing a three-dimensional simulation model is to analyze and discuss the effects of different excitation functions on the sound field in the focus area of HIFU treatment;Effect of phased parameters on energy density of phased annular ultrasound focusing has shallow calculation area.Simulation model of ultrasonic hifu piezoelectric crystal for treating breast tumors is a reference, and the focal region of the human tissue and the transducer axis is not perpendicular for influence of position, size and sound pressure distribution. The results are as follows:

(1)Under the same model conditions, the transducer uses different shapes of excitation waveform to form the focal zone sound pressure, focal length is different.

(2) About the phased ring focusing method,Hifu piezo transducer impedance is changing the focus area to the distance of the array and the straightness is the focus ring.The diameter d can change the energy density on the shallow section from the array 60 to later. Changing the diameter of the array element R has no effect on the shallow density.

(3) The acoustic axis of the transducer is not perpendicular to the human tissue, and is less than 5%. The angle is smaller, and the distance that the focal zone is shifted to the upper and lower directions perpendicular to the acoustic axis is larger. The focal lengths formed in different human tissues are shifted in different directions.

This paper uses the FDTD ultrasonic nonlinear simulation method proposed .The influence of the vibrator waveform on the sound pressure distribution in the focal region; the focusing parameters are of the different phase on the shallow layer.The effects of internal energy density were analyzed and provided theoretical data for the development of piezoelectric material HIFU piezo treatment plans.At the same time, with reference to the clinical treatment practice, a three-dimensional simulation model without axis symmetry is established for the future three-dimensional reality.The simulation calculation of human tissue has established an effective ,simple simulation method and software program. This study was established simulation model and simulation study only under the setting conditions of water body or single body tissue.When the human tissue is at an angle to the sound axis, the focal region is formed to deviate from the acoustic axis,It is also different from the direction of intramuscular offset, and its offset direction is related to which characteristic parameters of the HIFU piezo sensor

The calculation data cannot be judged within the scope of the calculation, and the research on the improvement needs to be further carried out. At the same time.The true model is still very different from the actual human tissue structure and tissue characteristics. The actual human tissue structure has simulation method and system simulation program of the three-dimensional model of organizational characteristics for further study.

High focus piezo ceramic therapy equipment is developed by using the similar acoustic parameters of human tissue and water.Medical treatment equipment is different for human soft tissues which have different acoustic parameters and sounds with water bodies.There are certain differences in the parameters of the study. In the actual treatment of HIFU, the focal area and water body formed in the human body.The focus area is different, and the patient's posture is different, even if the same part has the same disease HIFU.At the time of treatment, there may also be a focus area with a certain difference, which may result in the treatment system.Security and reliability are not guaranteed. Such as extracorporeal shock wave lithotripsy may appear hematuria, renal hematoma,Complications such as renal rupture may cause skin burns, nerve damage, and tumors in HIFU piezo vibration sensor tumor treatment.The organization cannot be completely fatal and other clinical problems. In order to solve these problems in the clinic, grasp and understand HIFU position, shape and size of the focal region formed by high-intensity ultrasound treatment. its sound pressure and energy density is necessary.