On spatially selective RF excitation and its analogy with spiral MR image acquisition |
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Authors: | Peter Börnert Bernd Aldefeld |
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Affiliation: | (1) Philips Research Laboratories, Roentgenstrasse 24-26, D-22335 Hamburg, Germany |
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Abstract: | The basic principles of the design of spatially selective RF pulses are described, and their analogy with MR image acquisition
and reconstruction is shown. The paper focuses on RF-pulse design and imaging schemes in which spiral k-space trajectories
are used. The sensitivity of RF excitation to gradient-system imperfections and to spatially varying off-resonance are analyzed,
and suitable measures of correction are discussed. The spatial resolution obtainable with selective RF pulses and the consequences
of the linearity of the pulse-design problem are examined. Phantom experiments showing the performance of multidimensional
spatially selective RF pulses further illustrate the analogy with MR image acquisition. |
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Keywords: | RF excitation Spiral imaging Gradient imperfections Off-resonance correction |
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