Home > In process > Calibration-Free GRAPE pTx Pulses for Homogeneous Spatial-Selective Excitation at 7T. > print

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024 7 _ |a 10.1002/mrm.70266
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024 7 _ |a 0740-3194
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037 _ _ |a DZNE-2026-00360
041 _ _ |a English
082 _ _ |a 610
100 1 _ |a Löwen, Daniel
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245 _ _ |a Calibration-Free GRAPE pTx Pulses for Homogeneous Spatial-Selective Excitation at 7T.
260 _ _ |a New York, NY [u.a.]
|c 2026
|b Wiley-Liss
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520 _ _ |a Extend the universal pulse GRAPE formalism to pulses with a defined spectral response, and apply the concept to spatial selection.We added Bloch simulations at several frequencies for each voxel to the pulse calculation to create universal spectrally-selective GRAPE pulses. With a superimposed constant gradient field spatial selection was achieved. The method was tested in slice- and slab-selective imaging experiments.Universal spatially-selective GRAPE pulses increased FA homogeneity and SNR. In 2D gradient echoes, the SNR could be increased by approximately 6% compared to CP pulses, and in a slab-selective TSE sequence, the SNR increased by 29% against k T -spokes pulses. Additionally, the slab-selective GRAPE pulse proved to be more robust against B 0 deviations and is significantly shorter in comparison to k T -spokes pulses while maintaining a similar FA homogeneity.Spatially-selective universal GRAPE pulses exhibit superior performance compared to k T -spokes pulses. These short and robust pTx pulses hold potential for enhancing a wide range of imaging applications, thereby advancing 7T MRI technology closer to clinical use.
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650 _ 7 |a GRAPE
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650 _ 7 |a parallel transmission
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650 _ 7 |a ultra‐high field
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650 _ 7 |a universal pulses
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650 _ 2 |a Phantoms, Imaging
|2 MeSH
650 _ 2 |a Humans
|2 MeSH
650 _ 2 |a Algorithms
|2 MeSH
650 _ 2 |a Magnetic Resonance Imaging: methods
|2 MeSH
650 _ 2 |a Signal-To-Noise Ratio
|2 MeSH
650 _ 2 |a Calibration
|2 MeSH
650 _ 2 |a Image Processing, Computer-Assisted: methods
|2 MeSH
650 _ 2 |a Computer Simulation
|2 MeSH
650 _ 2 |a Brain: diagnostic imaging
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700 1 _ |a Pracht, Eberhard D
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700 1 _ |a Veldmann, Marten
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700 1 _ |a Gras, Vincent
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700 1 _ |a Mauconduit, Franck
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700 1 _ |a Boulant, Nicolas
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700 1 _ |a Stöcker, Tony
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773 _ _ |a 10.1002/mrm.70266
|g Vol. 95, no. 6, p. 3104 - 3115
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|t Magnetic resonance in medicine
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