Intracranial Boundary Detection and Radio Frequency Correction in Magnetic Resonance Images

Blair Mackiewich

August 1995

• Abstract
• Acknowledgments
• Contents
• 1 Introduction
  • 1.1 Motivation
  • 1.2 Goals
  • 1.3 Research Methodology
  • 1.4 Thesis Overview and Scope
• 2 MR Imaging and Data Characteristics
  • 2.1 Overview
  • 2.2 Basic Principles of MRI
  • 2.3 RF Inhomogeneity
  • 2.4 Partial Volume Effect
  • 2.5 Background Noise Characteristics
  • 2.6 Brain Tissue Characteristics
  • 2.7 Summary
• 3 Previous Work
  • 3.1 Overview
  • 3.2 Intracranial Boundary Detection
  • 3.3 Radio Frequency Correction
  • 3.4 Summary
• 4 Nonlinear Anisotropic Diffusion Filtering
  • 4.1 Overview
  • 4.2 Definition
  • 4.3 Discrete Implementation
  • 4.4 Experiments
  • 4.5 Summary
• 5 Active Contour Models (``Snakes'')
  • 5.1 Overview
  • 5.2 Energy Formulation
  • 5.3 Experiments
  • 5.4 Summary
• 6 Homomorphic Filtering
  • 6.1 Overview
  • 6.2 Spectral Domain Homomorphic Filtering
  • 6.3 Spatial Domain Homomorphic Filtering
  • 6.4 Homomorphic Filtering using a Low Pass Filter
  • 6.5 Experiments
  • 6.6 Summary
• 7 Intracranial Boundary Detection and RF Correction
  • 7.1 Overview
  • 7.2 Segment Head
  • 7.3 Generate Initial Brain Mask
  • 7.4 Generate Final Brain Mask
  • 7.5 Correct Intensity
• 8 Results
  • 8.1 Overview
  • 8.2 MRI Data Set Descriptions
  • 8.3 Head Mask
  • 8.4 Initial Brain Mask
  • 8.5 Final Brain Mask
  • 8.6 Intensity Correction
  • 8.7 Summary
• 9 Summary
  • 9.1 Review
  • 9.2 Conclusions
  • 9.3 Future Work
• References
• About this document ...