Kompiuterine vaizdų analize pagrįstos sistemos, skirtos galvos smegenų tyrimams, analizė ir algoritmų plėtra

• Main Author: Maknickas, Ramūnas
• Other Authors: Barauskas, Rimantas
• Format: Dissertation
• Language: Lithuanian
• Published: Lithuanian Academic Libraries Network (LABT) 2005
• Subjects: Informatics; Human Brain Atlas Types; Spline Optimization; Vaizdų registracija; Non-rigid Image Transformation Functions; Overhauzerio splainas; Plonos plokštelės splainas; Splaino optimizacija; MR vaizdų segmentavimo algoritmų apžvalga; Taškų sutapatinimas; Points Correspondence; Taškų korespondencija; Žmogaus smegenų atlasų tipai; Vaizdų sutapatinimas; Overhauzer Spline; Overview of MRI Segmentation Algorithms; Image Registration; Thin-Plate Spline; Netiesinės vaizdų transformacijos funkcijos
• Online Access: http://vddb.library.lt/fedora/get/LT-eLABa-0001:E.02~2005~D_20050523_162613-36873/DS.005.0.01.ETD

One of the main problems in neurosurgery is knowledge about human brain. It's very important to see the whole brain with its critical neurostructures in virtual reality. This document is about three dimensional human brain visualization strategies. Review most recently used three dimensional objects building strategies from two dimensional medical MRI images. This task was split into 4 significant problems: image segmentation, point-sets correspondence, image registration and its frequently used transformation functions with image matching measurements. All these problems were addressed reader to show most recently used algorithms with advantages and disadvantages. Atlas types, patterns and maps survey was introduced with widely popular brain model coordinate systems. In order to find a better correspondence between two point sets it was modeled a new robust and accurate Overhauser spline points location optimization algorithm. Instead of deletion outlier points from overloaded point set, this algorithm generates more points in other set at optimized points locations. Determination of an accurate point location and choosing the correct transformation function are the key steps in registration process. Whereas registration is vital task in precise human brain visualization for neurosurgeries at preoperative and intraoperative process.