Research On Microwave Imaging Of Multiband Body Center Implant

With the rapid development of biomedicine,body center implants of various shapes and sizes have been widely used in clinical medicine.However,with the passage of time,body center implants may have various problems such as displacement and damage.In order to reduce the threat of these problems to human health,we need to regularly detect these people.Most of the body implants are made of metal and its alloys.Under a strong magnetic field,the metal will produce displacement and heating effects.Many traditional medical imaging technologies are difficult to detect them.Therefore,this paper designs a set of microwave imaging system to detect the body center implants.In microwave imaging,firstly,the shape of tissue is constructed according to the difference of electrical properties of different tissues,but the electrical properties of biological tissues are different at different frequencies;Secondly,the higher the microwave frequency is,the higher the imaging resolution is,but the weaker the penetration ability is.In addition,when high-power microwave is used to irradiate the implant,the tissue temperature around the implant will rise,which will cause injury to the subjects.Therefore,this paper uses low-power microwave to explore the microwave imaging of multi band body center implants.Based on the principle of confocal imaging,a set of low-power active microwave imaging system with single transmitter and single receiver is designed to explore the microwave imaging of multi band body center implants.The main contents include the following:(1)Build an active microwave imaging experimental platform.The first step is to build a microwave anechoic chamber with microwave absorbing materials to eliminate the interference of the surrounding environment;The second step is to select appropriate transmitting equipment,receiving equipment and corresponding control system for sending stable electromagnetic waves and receiving measured raw data.(2)Firstly,the microwave imaging of different sizes of body implant mimics was explored at the frequency of 2.6GHz.The experimental results show that the imaging accuracy of the experimental platform is good,and the mimics with sizes lower than half wavelength of microwave can also be imaged;Secondly,the microwave imaging of different shapes of body implant mimics was explored at the frequency of 2.6GHz.The experimental results show that the experimental platform can image different shapes of implant mimics;Again,taking 100 MHz as the step unit,explore the microwave imaging of the body implant phantom at the frequency of 2-3.6GHz.The experimental results show that the body implant phantom can be imaged at the frequency of 2-3.6GHz in this experimental platform,but the imaging effect is related to the frequency.The imaging effect at the frequency of 3.1GHz(solid shape)or 3.2GHz(ring shape)is better than other frequencies.(3)The body implant phantom was embedded on the surface or inside of the biological tissue phantom,and microwave imaging was explored at the frequencies of 2.6GHz,3.1GHz or3.2GHz.The experimental results show that the experimental platform can detect the shape and position of the implant phantom whether it is embedded on the surface or inside of the biological tissue phantom,but the imaging effect at 3.1GHz or 3.2GHz is better than that at2.6GHz.(4)This paper also uses two classical algorithms to denoise the original data.The experimental results show that the original data denoising can effectively improve the imaging quality.