Research And Application Of Medical-oriented Registration And Repair Method Of 3D Bone Model

Computer technology has developed rapidly in recent decades,and the introduction to computer technology in the medical field to help treatment have become a new research topic.Nowadays,computer-aided orthopedics technology has realized the leaping of bone images from two-dimensional to three-dimensional.Doctors can obtain the patient's bone information intuitively through the three-dimensional bone model in the computer,so as to make full preparations for the operation.At present,there are still many problems that need to be solved in the computer-assisted orthopedics technology in the medical application field.For example,for the fracture problem in medicine,the three-dimensional broken bone model can only provide the information of the existing injury and illness,and cannot provide the doctor with complete bone information;In terms of bone repair,how to quickly design a reasonable bionic bone internal structure and accelerate the internal structure generation speed is a problem that has been studied.This article has made an in-depth understanding of the research results of computerassisted orthopedics,and put forward its own research plan for the existing problems with the field of fracture and bone to repair.The main research contents of this article are as follows:(1)This paper designs a set of registration schemes for the registration problem of the three-dimensional broken bone model.In this paper,the sample bone model is introduced,and the sample bone model is used to provide the geometric information required for the initial registration of the broken bone model to complete the initial registration.In precise registration,the entire registration process is completed by using the ICP algorithm to stitch the broken sections of the broken bone model.(2)This paper redesigned a three-dimensional feature descriptor and geometric consistency matching strategy for the registration of different size models in the broken bone model registration scheme.Because the two models have similar shapes and different sizes.In response to this feature,this paper designed a scale-sensitive multi-scale elastic SHOT feature descriptor to improve the accuracy of matching.At the same time,in order to further increase the number of correct matches and reduce the calculation error of the rotational displacement matrix in the registration process,this paper designs a matching optimization strategy based on geometric consistency.The final experimental results show that the scheme can meet the registration requirements of the broken bone model.(3)Aiming at the problem of porous structure design in bone repair,this paper designs a scheme for generating a porous structure of the skeleton model based on the TPMS(threeperiod minimal surface)structure.By extracting the surface data onto the bone model,the TPMS structure is constrained in shape,so that it can be spliced with the bone model,and the internal structure of the bone models are optimized.The experimental results show that our method achieves the porous structure design of the skeleton model.Through the above work,we have completed the registration and repair of the threedimensional skeleton model.The final experimental results show that our work has certain practical significance.