Breast Virtual Atlas: conception and initial modeling results

Leonardo C. FialhoRafael B. FariasRenato V. GuadagninLourdes M. BrasilEdílson FernedaRemis BalaniukRildo R. dos SantosFátima L. S. NunesFábio M.Ramos

Human anatomy is studied with human cadavers and illustrative books. The last one is two-dimensional and so in general does not provide a comprehensive idea about the theme to thestudent. A three-dimensional visualization offers much more information and can be an important aid both in teaching and in learning processes in Heath Sciences. A Breast Virtual Atlas (VIRTUATLAS) is being developed at Catholic University of Brasilia, Brazil, Preliminary results concerning 3-dimensional modeling of breast are here presented. Other Brazilian and foreign universities as well as a breast clinic take part in the project. This Atlas is supposed to illustrate the upper part of female thorax three-dimensionally. It will allow to visualize the different layers of the internal structures and to see explaining texts about them. The user will be able to rotate the model to obtain different views using the computer mouse.In this context the project VIRTUATLAS aims to support the study of breast anatomy and structure, including the development of breast carcinomas, its stages and specific structures by means of Virtual Reality (VR). In other words, it is expected:a) to implement simulation models about breast anatomy; b) to implement simulation models about physiopathology;c) to implement a data base on breast anatomy and on a wide variety of physiopathological structures, to be accessed by previously defined descriptors; d) to implement an interface based on VR that will provide information for didactical and therapeutical purposes; e) to implement usage procedures of the Virtual Atlas based on Intelligent Tutoring Systems (ITS). The Project VIRTUATLAS integrates the project IACVIRTUAL (Artificial Intelligence applied to modeling and implementing of a virtual doctor's office) that is also being developed at the Catholic University of Brasilia.So far a monochromatic image was generated, where intensity contrasts result from one only illumination source, whose position can be changed by user. It is already possible to adjust size in orthogonal directions, so enabling a closer representation of breasts external anatomy.The program is able to take different sizes in account, so achieving more realism. Color features of skin will be soon included in order to enlarge the model use. The next steps concerning modeling will encompass internal structures of low complexity of healthy tissues.

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