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X-Gradients X+Z-Gradients Z Z Z Radiology X B 0 B 0 B 0 B 0 + B 0 Radiology X X X+Z-Gradients Possible Slice Spin Isochromat Group of spins with the same resonance frequency. k-space Z Radiology X 24
What is k-space 1D k-space • Spatial Frequency Mapping – Each echo measures some of the spatial frequencies that comprise the object – k-space has units of cm -1 or mm -1 – Audio signals have units of Hertz (s -1 ) • A line of k-space is filled by an echo • 2D FT of k-space produces the image time -orspace Any signal/image can be decomposed into a summation of sine waves of appropriate amplitude. Radiology Radiology 1D k-space 1D k-space time -orspace time -orspace Any signal/image can be decomposed into a summation of sine waves of appropriate amplitude. Any signal/image can be decomposed into a summation of sine waves of appropriate amplitude. Radiology Radiology
Page 1 and 2: Introduction to MRI Daniel B. Ennis
Page 3 and 4: Bulk Magnetization Zeeman Splitting
Page 5 and 6: Dipoles to Images Coils µ Magnetic
Page 7: Gradients MRI Instrumentation • G
Page 11 and 12: Center What is k-space Contrast Wha
Page 13 and 14: 1952 Nobel Prize in Physics “for
Page 15 and 16: T2 Relaxation • Transverse or spi
Page 17 and 18: What are echoes What are echoes •
Page 19 and 20: Spin Echo Spin Echo RF 90° 180° R
Page 21 and 22: Spin Echo - Contrast Spin Echo - Va
Page 23 and 24: Radiology 180° Inversion Recovery
Page 25 and 26: Basic Gradient Echo Sequence TR TE
Page 27 and 28: Spoiled GRE & Ernst Angle 90° 180

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