Principles of MRI
Physics and Engineering
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What is image formation?
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Gradient Coils
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Spatial Encoding of the MR
Signal
Spatial Encoding of the MR
Signal
Steps in 3D Localization
RF Field: Excitation Pulse
Gradient Fields: Spatially
Nonuniform B:
ΠExciting and Receiving Mxy in a Thin Slice
of Tissue
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Determining slice thickness
Changing slice thickness
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Selecting different slices
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Readout Localization (frequency encoding)
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Image Resolution (in Plane)
Calculation of the Field of
View (FOV)
along frequency encoding direction
Ž The Second Dimension: Phase Encoding
A typical diagram for MRI
phase encoding:
Gradient-echo imaging
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Multi-slice acquisition
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Part II.2 Introduction to
k-space
(a space of the spatial frequency)
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Two Spaces
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The k-space Trajectory
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