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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 Fourier Representation What is k-space k-space image space time -orspace ➠ FFT FFT ➠ low frequency high k-space is the raw data collected by the scanner. Radiology
Center What is k-space Contrast What is k-space ➠ FFT Edges Edges Contrast Information ➠ FFT Points in k-space represent different patterns in an image. Radiology Radiology k-space k-space spikes image space k-space and Field of View ky kx FFT ➠ ➠ FFT ky FOV = 1 k kx FFT ➠ A k-space spike creates a banding artifact. Radiology Radiology Uniformly skipping lines in k-space causes aliasing.
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 and 8: Gradients MRI Instrumentation • G
Page 9: What is k-space 1D k-space • Spat
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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