Open Access. Powered by Scholars. Published by Universities.®
Biomedical Engineering and Bioengineering Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Biomedical Engineering and Bioengineering
Optimization Of Wsu Total Ankle Replacement Systems, Bradley Jay Elliott
Optimization Of Wsu Total Ankle Replacement Systems, Bradley Jay Elliott
Browse all Theses and Dissertations
Total ankle arthroplasty (TAR) is performed in order to reduce the pain and loss of ambulation in patients with various forms of arthritis and trauma. Although replacement devices fail by a number of mechanisms, wear in the polyethylene liner constitutes one of the dominating failure modes. This leads to instability and loosening of the implant. Mechanisms that contribute to wear in the liners are high contact and subsurface stresses that break down the material over time. Therefore, it is important to understand the gait that generates these stresses. Methods to characterize and decrease wear in Ohio TARs have been performed …
Application Of The Human-Machine Interaction Model To Multiple Attribute Task Battery (Matb): Task Component Interaction And The Strategy Paradigm, Craig M. Walters
Application Of The Human-Machine Interaction Model To Multiple Attribute Task Battery (Matb): Task Component Interaction And The Strategy Paradigm, Craig M. Walters
Browse all Theses and Dissertations
The Multiple-Attribute Task Battery (MATB) is composed of four simultaneously running components to which a human operator responds. A prior report has quantified information content as a machine input baud rate using the Hick-Hyman and Fitt's Laws for three of the four components and defines a strategy function. This report covers methods to quantify information content of the fourth component, creating a single metric which describes overall task complexity and evaluates human performance and strategy. Six MATB task-scenarios (combinations of two, three, or all four MATB components) each at two input baud rates are evaluated. Subjects were also provided with …
System Optimization And Patient Translational Motion Correction For Reduction Of Artifacts In A Fan-Beam Ct Scanner, Zachary Gordon Lee Wise
System Optimization And Patient Translational Motion Correction For Reduction Of Artifacts In A Fan-Beam Ct Scanner, Zachary Gordon Lee Wise
Browse all Theses and Dissertations
In computed tomography (CT) systems, many different artifacts may be present in the reconstructed image. These artifacts can greatly reduce image quality. For our laboratory prototype CT system, a fan-beam/cone-beam focal high-resolution computed tomography (fHRCT) scanner, the major artifacts that affect image quality are distortions due to errors in the reconstruction algorithm's geometric parameters, ring artifacts caused by uncalibrated detectors, cupping and streaking created by beam hardening, and patient-based motion artifacts. Optimization of the system was required to reduce the effects of the first three artifact types, and an algorithm for correction of translational motion was developed for the last. …
Evaluation Of Interpolation And Registration Techniques In Magnetic Resonance Image For Orthogonal Plane Super Resolution Reconstruction, Amir Pasha Mahmoudzadeh
Evaluation Of Interpolation And Registration Techniques In Magnetic Resonance Image For Orthogonal Plane Super Resolution Reconstruction, Amir Pasha Mahmoudzadeh
Browse all Theses and Dissertations
Super resolution reconstruction (SRR) combines several perspectives of an image (typically low resolution) in order to reconstruct a more complete and comprehensive (higher resolution) image. The aim is to use this concept on magnetic resonance imaging (MRI) data, for which the standard is to scan in several-plane orientation in a 2D fashion. As a result, clinical MRI, functional MRI (FMRI), diffusion weighted imaging (DWI)/diffusion tensor imaging (DTI), and MR angiography (MRA) tend to have high in- plane resolution but low resolution in the slice-select direction. By combining the 2 scans of the orthogonal plane, new 3D images can be reconstructed. …