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Biomechanics applied to computer-aided diagnosis: examples of orbital and maxillofacial surgeries  [PDF]
Yohan Payan,Vincent Luboz,Matthieu Chabanas,Pascal Swider,Christophe Marecaux,Franck Boutault
Physics , 2006,
Abstract: This paper introduces the methodology proposed by our group to model the biological soft tissues deformations and to couple these models with Computer-Assisted Surgical (CAS) applications. After designing CAS protocols that mainly focused on bony structures, the Computer Aided Medical Imaging group of Laboratory TIMC (CNRS, France) now tries to take into account the behaviour of soft tissues in the CAS context. For this, a methodology, originally published under the name of the Mesh-Matching method, has been proposed to elaborate patient specific models. Starting from an elaborate manually-built "generic" Finite Element (FE) model of a given anatomical structure, models adapted to the geometries of each new patient ("patient specific" FE models) are automatically generated through a non-linear elastic registration algorithm. This paper presents the general methodology of the Mesh-Matching method and illustrates this process with two clinical applications, namely the orbital and the maxillofacial computer-assisted surgeries.
Computer-aided planning for zygomatic bone reconstruction in maxillofacial traumatology  [PDF]
Sylvain Maubleu,Christophe Marecaux,Matthieu Chabanas,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: An optimal planning procedure has been proposed to define the target position of the zygomatic bone following a fracture of the mid-face skeleton. The protocol has been successfully tested on healthy subjects, and ensures the global symmetry of the face could be obtained after the reconstruction surgery. Now that the planning procedure is available, the next step of this project will be to develop an intra-operative guiding system to help the surgeon to follow the planning. This procedure will mainly rely on the intra-operative registration of the zygomatic bone fragment, and the design of specific surgical ancillaries for cranio-maxillofacial surgery.
Computer aided planning for orthognatic surgery  [PDF]
Matthieu Chabanas,Christophe Marecaux,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: A computer aided maxillofacial sequence is presented, applied to orthognatic surgery. It consists of 5 main stages: data acquisition and integration, surgical planning, surgical simulation, and per operative assistance. The planning and simulation steps are then addressed in a way that is clinically relevant. First concepts toward a 3D cephalometry are presented for a morphological analysis, surgical planning, and bone and soft tissue simulation. The aesthetic surgical outcomes of bone repositioning are studied with a biomechanical Finite Element soft tissue model.
Application of computer aided surgery system and 3D printing technology in the reconstruction of the defects in oral and maxillofacial region

- , 2016, DOI: 10.7518/gjkq.2016.06.023
Abstract: 摘要: 数字医学是一门新兴的多领域交叉学科,数字医学的快速发展,给临床医学带来了革命性变化。尤其是计算机辅助手术系统的开发与应用,使医学进入了一个全新的可视化的信息时代,其与3D打印技术相结合,推动了精准外科手术的发展,引发外科领域的技术革命,促进外科治疗发生质的飞跃。口腔颌面部缺损的修复重建具有复杂性与高要求的特点,计算机辅助手术系统与3D打印技术在口腔颌面部缺损修复重建中的应用,深刻地改变了这一领域的面貌。本文对计算机辅助手术系统与3D打印技术在口腔颌面部缺损修复重建中的应用与进展作一综述,并对其发展前景进行展望。
Abstract: The rapid development of digital medicine brought the revolutionary change to clinical medicine, which was an emerging interdisciplinary field. The development and application of computer aided surgery system made the medicine enter a completely new visual information age especially, which promoted the development of precise and effective surgical treatment for qualitative leap and triggers a technology revolution in the field of surgery with the combination of 3D printing technology. The computer aided surgery system with 3D printing technology was extensively and profoundly applied in reconstruction of the defect in oral and maxillofacial region, which was complex and demanding. The paper reviewed the application and progress of computer aided surgery system and 3D printing technology in reconstruction of the defect in oral and maxillofacial region
Orbital and Maxillofacial Computer Aided Surgery: Patient-Specific Finite Element Models To Predict Surgical Outcomes  [PDF]
Vincent Luboz,Matthieu Chabanas,Pascal Swider,Yohan Payan
Physics , 2006,
Abstract: This paper addresses an important issue raised for the clinical relevance of Computer-Assisted Surgical applications, namely the methodology used to automatically build patient-specific Finite Element (FE) models of anatomical structures. From this perspective, a method is proposed, based on a technique called the Mesh-Matching method, followed by a process that corrects mesh irregularities. The Mesh-Matching algorithm generates patient-specific volume meshes from an existing generic model. The mesh regularization process is based on the Jacobian matrix transform related to the FE reference element and the current element. This method for generating patient-specific FE models is first applied to Computer-Assisted maxillofacial surgery, and more precisely to the FE elastic modelling of patient facial soft tissues. For each patient, the planned bone osteotomies (mandible, maxilla, chin) are used as boundary conditions to deform the FE face model, in order to predict the aesthetic outcome of the surgery. Seven FE patient-specific models were successfully generated by our method. For one patient, the prediction of the FE model is qualitatively compared with the patient's post-operative appearance, measured from a Computer Tomography scan. Then, our methodology is applied to Computer-Assisted orbital surgery. It is, therefore, evaluated for the generation of eleven patient-specific FE poroelastic models of the orbital soft tissues. These models are used to predict the consequences of the surgical decompression of the orbit. More precisely, an average law is extrapolated from the simulations carried out for each patient model. This law links the size of the osteotomy (i.e. the surgical gesture) and the backward displacement of the eyeball (the consequence of the surgical gesture).
Models for Planning and Simulation in Computer Assisted Orthognatic Surgery  [PDF]
Matthieu Chabanas,Christophe Marecaux,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: Two aspects required to establish a planning in orthognatic surgery are addressed in this paper. First, a 3D cephalometric analysis, which is clini-cally essential for the therapeutic decision. Then, an original method to build a biomechanical model of patient face soft tissue, which provides evaluation of the aesthetic outcomes of an intervention. Both points are developed within a clinical application context for computer aided maxillofacial surgery.
Computer-Aided Diagnosis in Mammography Using Content-Based Image Retrieval Approaches: Current Status and Future Perspectives  [PDF]
Bin Zheng
Algorithms , 2009, DOI: 10.3390/a2020828
Abstract: As the rapid advance of digital imaging technologies, the content-based image retrieval (CBIR) has became one of the most vivid research areas in computer vision. In the last several years, developing computer-aided detection and/or diagnosis (CAD) schemes that use CBIR to search for the clinically relevant and visually similar medical images (or regions) depicting suspicious lesions has also been attracting research interest. CBIR-based CAD schemes have potential to provide radiologists with “visual aid” and increase their confidence in accepting CAD-cued results in the decision making. The CAD performance and reliability depends on a number of factors including the optimization of lesion segmentation, feature selection, reference database size, computational efficiency, and relationship between the clinical relevance and visual similarity of the CAD results. By presenting and comparing a number of approaches commonly used in previous studies, this article identifies and discusses the optimal approaches in developing CBIR-based CAD schemes and assessing their performance. Although preliminary studies have suggested that using CBIR-based CAD schemes might improve radiologists’ performance and/or increase their confidence in the decision making, this technology is still in the early development stage. Much research work is needed before the CBIR-based CAD schemes can be accepted in the clinical practice.
Future Computer-aided Decision-making Support Systems: Concerning more about the Mechanism of Human Behavior  [cached]
Juan Liu,Yajun Liu,Wei Pan,Xianghong Sun
Journal of Software , 2012, DOI: 10.4304/jsw.7.3.712-717
Abstract: With the development of computer and network technology, more and more areas (such as power system security control, medical diagnosis system, government emergency management, stock invesment strategy anallysis, etc.) have gradually established decision-making support systems, which are mainly responsible for information collection, management and analysis. Studies show that decision-making support systems have greatly enhanced user productivity. So the engineers’ interest in designing computerized decision support systems has considerably increased in recent years. The current decision support systems mainly focus on data acquisition and analysis. They are responsible for providing large amounts of data continuously and delivering adaptable models, which can enable people to use these results effectively and then make decisions more quickly and accurately. Then, is there any real-time decision support system in the future that can change human’s judgment and decision-making? By behavior science research, this paper will provide some answers by presenting the results of a study that subliminal vision signal may have direct influence on human’s advanced cognitive process and finally change human’s decision under ambiguity. It will provide key technology and new research ideas for engineers to design more intelligent and more powerful decision-making support systems in the future.
Computer Aided Design of Couplings  [PDF]
Adeyeri Michael Kanisuru, Adeyemi Michael Bolaji , Ajayi Olumuyiwa Bamidele, Abadariki Samson Olaniran
International Journal of Engineering , 2011,
Abstract: The research work explores computer-aided approach to the design of ten different couplings, viza viz: flange, solid rigid, hollow rigid, old ham/ cross-sliding, pin type flexible, sleeve, seller cone/compression, split muff, pulley flange and fairbian’s lap-box couplings. The approach utilizesstandard design equations of these couplings and link them together in computer software todetermine the design parameters of the couplings. The work reviews the procedural stepsinvolved in the design of couplings and the development of the software package using java as atool for the design and dratfting of couplings. The design software named COUPLINGCADcombines with sketch template of a single process so as to generate the required parameters ofthe couplings. The COUPLINGCAD was tested with a number of case studies and the resultsobtained therein were quite satisfactory.
Oral and maxillofacial surgery in China: Past, present and future  [PDF]
Jiawei Zheng, Bing Fang, Shanyong Zhang, Chi Yang, Guofang Shen, Weiliu Qiu, Zhiyuan Zhang
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.37060

China is the most highly populated developing country. As with other scientific disciplines, dentistry (stomatology) is progressively growing since 1949 when the new China was founded. Due to the closing of the country to international discourse for several decades, international counterparts know very little about dentistry or stomatology, including the sub-discipline oral and maxillofacial surgery. This paper is aimed to introduce the scope, give a brief history, update clinical and basic research, and discuss the future of oral and maxillofacial surgery in China. It will hopefully help international colleagues to have an insight into the developmental history, education system, clinical and basic research achievements, as well as the prospective future of oral and maxillofacial surgery in China

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