Algorithm Research Of Dental Implanting Guide Template Based On Digital Image Technology

Based on the digital image processing technology for computer aided design of oral surgical implanting operation, the algorithm research and implementation of3d digital intelligently positioning guide template is the important content of computer aided design for surgical operation planning and the challenging topic in the field of digital medical. As a new field mix up the modern information technology and medical science, the theoretical research, technology development and application practice of the "Digital medical" has been formed a vibrant and energetic new discipline. Along with the development of digital image processing technology, visualization technology, artificial intelligent algorithm, high precision spiral CT scanning technology, computer information processing technology,and experimental research of the implant surgery,to segment and display the target zone of image, to design and simulate to forecast the individual surgical implanting operation in preoperative, to make the3D digital implanting guide template has become the new topics of international research, and help to solve the huge domestic market demand of oral implant operation. To succeed in oral implant surgical operation requires not only making scientific, reliable, safe curative planning for patients in preoperative, but also providing more reliable navigation for the operation implementation. However the implant guide template has remarkable effect for implanting operation, and has been clinically obtained the widespread application, further guarantees the security and reliability, reduces the complexity, finally increases the rate of success of implanting operation.The goal is to research the key algorithms of making the guide template, and then to design the operation navigating software system, which suits the domestic condition and is accepted by the vast number of dental implant patients at economic capability, mainly applies to oral surgical implantation and possesses proprietary intellectual property rights. it not only makes virtual segmentation on the3D reconstructed model, analyses and measures the critical parameters, but also intelligently locates the orientation of the implant, derives the data from virtual guide template to produce the real template, finally implement the computer aided design for implanting operation planning and the effect of navigation. This paper focuses on the algorithm research of the core module of the system design, analysis and implementation of key algorithm model, puts forward a series of new solutions. The main work and innovation include:Firstly, discusses virtual segmentation design of digital image based on the Kochanek-Bartels spline curve in3D model. An algorithm of image segmentation based on the Kochanek-Bartels spline curve fitting has been put forward, so display and observation of the cutting image is more accurate, efficient, flexible and easy to control inside3D volume rendering model. We can manually set series of control points, and then use the points to generate natural smooth spline curve, so construct the cutting route of implanting operation desired, implement the function to simply and precisely extract the information of a specific slice region. The cutting route may be built on a two-dimensional plane, also it can be applied in3D, with a wide range of uses.Secondly, research the algorithm design of intelligently locating orientation of virtual implant in3D volume rendering model. Its intelligence reflects in the use of artificial intelligent technology to search a global optimal solution to locate and design the implant, and is different from the domestic and foreign products which adopt the manual locating method. The algorithm bases on3D volume rendering with sequence of CT images, is to improve genetic algorithm as the core and to extract the information of implanting area in3D data field as the solution space of the encoding parameters, encodes with the endpoint coordinates, length, diameter, the appearance matching of virtual implant and so on, make the objective function accord with implanting standard and demand, apply adaptive fitness function, finally get the global optimal solution and obtain the parameters of endpoint coordinates, spatial orientation, size. The algorithm considers various planting requirements, conditions, standards, clinical experience and other information, to ensure the implant location and form design are scientific and effective, easy to control, intelligent.Thirdly, discuss the algorithm design of guide template automatically generated on virtual environment. The shape design of guide template contains the location, size, depth, angle of the implant. The guide template is as the final information carrier in a preoperative planning, preoperative design is implemented through the operation template to locate and guide the implanting precisely and scientifically. After using evolutionary algorithm to determine the parameters of implant inside3D digital skull model, the algorithm uses the information of implanting objective region to automatically generate a virtual guide template. In the internal environment of complex skull model,outline and segment the irregular target region layer by layer with the specific environment conditions and implant standard, rebuild the objective region outlined, use Boolean operation to separate the space of virtual digital implant to produce the guide hole for virtual template, and finally extract the data information of virtual guide template with guide holes.