PPT Slide
Physiological Correlates of Brain Electrical Activity
Hemodynamic Correlates of Neuronal Activation
Magnetic Properties of Hemoglobin
Magnetic Field Distortions Around a Cylinder
Variation with O2 Saturation
Variation with ?
Extravascular Contribution
BOLD Imaging: Extravascular Contribution
Intravascular Contribution: heterogeneous orientation
Intravascular Contribution: blood T2
Tissue and Blood Contributions
Gradient Echo versus Spin Echo Sensitivity to Vessel Size
Functional MRI
Functional Imaging Sequences
Conventional Gradient Echo Imaging
Echo Planar Imaging
Gradient Echo EPI
Spiral Imaging
High Field Systems
BOLD Signal
BOLD Field Dependence
BOLD Signal Dependence with Field
Artifacts and Signal Recovery
Shimming Problems
EPI Geometric Distortions
Spiral Off-Resonance Distortions
Gradient echo Signal Loss
Improved Shimming Methods
Diamagnetic Mouth Shim
Z-Shimming Methods
Hybrid RF Excitation Pulses
Other Physiological fMRI Measures
Summary
Email: peterj@fmrib.ox.ac.uk
Home Page: http://www.fmrib.ox.ac.uk/physics