Knigavko Y. Methods and tools for computer planning of plastic interventions on the human face

The thesis is devoted to the development of new methods and tools for plastic interventions planning on the human face. The work is a synthesis of three research areas united by a common purpose. The two areas have applied nature. And one are can be called methodical because the methods developed in this direction allow practically solve applied problems of research. The development of methods and tools of computer planning plastic interventions on the human face was performed in the following sequence. First the algorithms and programs that provide the possibility of 3D visualization of the human head were created. Thus formulate and solve the task of creating a software that can be deployed to any universal high performance computers. By the author of the work were resolved local problems: initial computer processing CT data or photogrammetric data, tone mapping, segmentation of CT images of the human head, defining the contours of the segmented re-gions on the CT slices, development of a visualization subsystem for the rendering of polygonal models of facial anatomical structures and upper respiratory tract, constructing polygonal models of a face and upper respiratory tract by processing CT of the patient's head, development of methods for software volume rendering of CT data. The implementation of these research goals allows move to the next problem - the problem of creation of virtual computer models of the human face, that allow to make nec-essary adjustments in the model according to the wishes of the patient and corresponding to the natural biological and anatomical requirements. For the solution of this problem by using a CT data method based on voxels moving was developed. This method is the least operator timeconsuming and, also most fast. Two methods of moving elements tomographic volume were developed. One of them is effective if not many voxels was moved, but allows biological interpretation of the process. The second one is more abstract and more universal. For the second method the was developed class of functions that provide opportunities for various forms of transformation of the spatial model. For plastic interventions modeling using photogrammetric data the deformation method was developed. This 3D deformation method is based on polygonal meshes transformations and using of the sculpting brush. The use of different functional expressions that define the nature of the use of this deformation tool was investigated. The third area of research was the solving problem of determining the indications for rhinoplasty through the creation of three-dimensional model of the upper respiratory tract and evaluation on the basis of this model, the functional viability of the patient's nose breathe. For this purposes was built aerodynamic model which describes the movement of air in the upper airways, and together with the results of introscopic investigations allows to create iterative algorithm for establishing functional viability of the patient's nose, and, therefore, the presence or absence indications for rhinoplasty.