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Purpose Development of a maxillofacial surgery simulation software capable of predicting a patient’s appearance after surgery. Methods We have derived a new mass-spring model (MSM) equivalent to a linear finite element (FE) model for cubic elements. In addition, we propose the scaled displacement method as a new method to perform the simulation more realistically. Results The average error of...
Objective This paper presents a detailed study of fractal-based methods for texture characterization of mammographic mass lesions and architectural distortion. The purpose of this study is to explore the use of fractal and lacunarity analysis for the characterization and classification of both tumor lesions and normal breast parenchyma in mammography. Materials and methods We conducted comparative...
Objects We present computer-assisted diagnosis (CAD) software designed to improve prostate cancer detection using perfusion MRI data. Methods In addition to standard visualization features, this software allows for the 2D and multislice 2D contouring of suspicious areas based on a seeded region growing algorithm, and area labeling based on zonal anatomy. Tumor volume assessment and the semiquantitative...
Purpose An important issue in computer-assisted surgery of the liver is a fast and reliable transfer of preoperative resection plans to the intraoperative situation. One problem is to match the planning data, derived from preoperative CT or MR images, with 3D ultrasound images of the liver, acquired during surgery. As the liver deforms significantly in the intraoperative situation non-rigid registration...
Objective The objective of our work is to develop and validate a viscoelastic and nonlinear physical liver model for organ model-based needle insertion, in which the deformation of an organ is estimated and predicted, and the needle path is determined with organ deformation taken into consideration. Materials and Methods First, an overview is given of the development of the physical liver model...
Introduction Surgical and interventional procedures increasingly rely on spatial measurement systems. One of the most popular is NDI’s Polaris Vicra®. Unfortunately, this system cannot be used for magnetic resonance imaging (MRI) procedures because of the image artifacts that it produces. Materials and methods Here, a simple method for hardware electrical shielding is presented which makes the...
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