Universal nonselective excitation and refocusing pulses with improved robustness to off‐resonance for Magnetic Resonance Imaging at 7 Tesla with parallel transmission
Purpose In MRI at ultra‐high field, the kT‐point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission (pTX) and universal pulse techniques to create uniform excitation in a calibration‐free manner. However, in these approaches, pulse d...
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| Published in | Magnetic resonance in medicine Vol. 85; no. 2; pp. 678 - 693 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
Wiley Subscription Services, Inc
01.02.2021
Wiley |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0740-3194 1522-2594 1522-2594 |
| DOI | 10.1002/mrm.28441 |
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| Abstract | Purpose
In MRI at ultra‐high field, the
kT‐point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission (pTX) and universal pulse techniques to create uniform excitation in a calibration‐free manner. However, in these approaches, pulse duration is typically increased as compared to standard hard pulses, and excitation quality in regions exhibiting large resonance frequency offsets often suffer. This limitation is inherent to structure of
kT‐point or SPINS pulse, and likely can be mitigated using parameterization‐free pulse design approaches.
Methods
The Gradient Ascent Pulse Engineering (GRAPE) algorithm was used to design parameterization‐free RF and magnetic field gradient (MFG) waveforms for creating
8∘ excitation, up to
105∘ scalable refocusing and inversion, nonselectively across the brain. Simulations were performed to provide flip angle normalized root‐mean‐squares error (FA‐NRMSE) estimations for the
8∘ and the
180∘kT‐point, SPINS, and GRAPE pulses. GRAPE pulses were tested experimentally with anatomical head scans at 7T.
Results
As compared to
kT‐points and SPINS, GRAPE provided substantial improvement of excitation, refocusing, and inversion quality at off‐resonance while at least preserving the same global FA‐NRMSE performance. As compared to
kT‐points, GRAPE allowed for a substantial reduction of the pulse duration for the
8∘ excitation and the
105∘ refocusing.
Conclusions
Parameterization‐free universal nonselective pTX‐pulses were successfully computed using GRAPE. Performance gains as compared to
kT‐points were validated numerically and experimentally for three imaging protocols. In its current implementation, the computational burden of GRAPE limits its use to applications where pulse computations are not subject to time constraints. |
|---|---|
| AbstractList | PurposeIn MRI at ultra‐high field, the $K_T$point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission (pTX) and universal pulse techniques to create uniform excitation in a calibration‐free manner. However, in these approaches, pulse duration is typically increased as compared to standard hard pulses, and excitation quality in regions exhibiting large resonance frequency offsets often suffer. This limitation is inherent to structure of $K_T$‐point or SPINS pulse, and likely can be mitigated using parameterization‐free pulse design approaches.MethodsThe Gradient Ascent Pulse Engineering (GRAPE) algorithm was used to design parameterization‐free RF and magnetic field gradient (MFG) waveforms for creating $8°$ excitation, up to $105°$ scalable refocusing and inversion, nonselectively across the brain. Simulations were performed to provide flip angle normalized root‐mean‐squares error (FA‐NRMSE) estimations for the $8°$ and the $180°K_T$‐point, SPINS, and GRAPE pulses. GRAPE pulses were tested experimentally with anatomical head scans at 7T.ResultsAs compared to $_T$‐points and SPINS, GRAPE provided substantial improvement of excitation, refocusing, and inversion quality at off‐resonance while at least preserving the same global FA‐NRMSE performance. As compared to $K_T$‐points, GRAPE allowed for a substantial reduction of the pulse duration for the $8°$ excitation and the $105°$ refocusing.ConclusionsParameterization‐free universal nonselective pTX‐pulses were successfully computed using GRAPE. Performance gains as compared to $K_T$‐points were validated numerically and experimentally for three imaging protocols. In its current implementation, the computational burden of GRAPE limits its use to applications where pulse computations are not subject to time constraints. PurposeIn MRI at ultra‐high field, the kT‐point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission (pTX) and universal pulse techniques to create uniform excitation in a calibration‐free manner. However, in these approaches, pulse duration is typically increased as compared to standard hard pulses, and excitation quality in regions exhibiting large resonance frequency offsets often suffer. This limitation is inherent to structure of kT‐point or SPINS pulse, and likely can be mitigated using parameterization‐free pulse design approaches.MethodsThe Gradient Ascent Pulse Engineering (GRAPE) algorithm was used to design parameterization‐free RF and magnetic field gradient (MFG) waveforms for creating 8∘ excitation, up to 105∘ scalable refocusing and inversion, nonselectively across the brain. Simulations were performed to provide flip angle normalized root‐mean‐squares error (FA‐NRMSE) estimations for the 8∘ and the 180∘kT‐point, SPINS, and GRAPE pulses. GRAPE pulses were tested experimentally with anatomical head scans at 7T.ResultsAs compared to kT‐points and SPINS, GRAPE provided substantial improvement of excitation, refocusing, and inversion quality at off‐resonance while at least preserving the same global FA‐NRMSE performance. As compared to kT‐points, GRAPE allowed for a substantial reduction of the pulse duration for the 8∘ excitation and the 105∘ refocusing.ConclusionsParameterization‐free universal nonselective pTX‐pulses were successfully computed using GRAPE. Performance gains as compared to kT‐points were validated numerically and experimentally for three imaging protocols. In its current implementation, the computational burden of GRAPE limits its use to applications where pulse computations are not subject to time constraints. Purpose In MRI at ultra‐high field, the kT‐point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission (pTX) and universal pulse techniques to create uniform excitation in a calibration‐free manner. However, in these approaches, pulse duration is typically increased as compared to standard hard pulses, and excitation quality in regions exhibiting large resonance frequency offsets often suffer. This limitation is inherent to structure of kT‐point or SPINS pulse, and likely can be mitigated using parameterization‐free pulse design approaches. Methods The Gradient Ascent Pulse Engineering (GRAPE) algorithm was used to design parameterization‐free RF and magnetic field gradient (MFG) waveforms for creating 8∘ excitation, up to 105∘ scalable refocusing and inversion, nonselectively across the brain. Simulations were performed to provide flip angle normalized root‐mean‐squares error (FA‐NRMSE) estimations for the 8∘ and the 180∘kT‐point, SPINS, and GRAPE pulses. GRAPE pulses were tested experimentally with anatomical head scans at 7T. Results As compared to kT‐points and SPINS, GRAPE provided substantial improvement of excitation, refocusing, and inversion quality at off‐resonance while at least preserving the same global FA‐NRMSE performance. As compared to kT‐points, GRAPE allowed for a substantial reduction of the pulse duration for the 8∘ excitation and the 105∘ refocusing. Conclusions Parameterization‐free universal nonselective pTX‐pulses were successfully computed using GRAPE. Performance gains as compared to kT‐points were validated numerically and experimentally for three imaging protocols. In its current implementation, the computational burden of GRAPE limits its use to applications where pulse computations are not subject to time constraints. In MRI at ultra-high field, the kT -point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission (pTX) and universal pulse techniques to create uniform excitation in a calibration-free manner. However, in these approaches, pulse duration is typically increased as compared to standard hard pulses, and excitation quality in regions exhibiting large resonance frequency offsets often suffer. This limitation is inherent to structure of kT -point or SPINS pulse, and likely can be mitigated using parameterization-free pulse design approaches.PURPOSEIn MRI at ultra-high field, the kT -point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission (pTX) and universal pulse techniques to create uniform excitation in a calibration-free manner. However, in these approaches, pulse duration is typically increased as compared to standard hard pulses, and excitation quality in regions exhibiting large resonance frequency offsets often suffer. This limitation is inherent to structure of kT -point or SPINS pulse, and likely can be mitigated using parameterization-free pulse design approaches.The Gradient Ascent Pulse Engineering (GRAPE) algorithm was used to design parameterization-free RF and magnetic field gradient (MFG) waveforms for creating 8∘ excitation, up to 105∘ scalable refocusing and inversion, nonselectively across the brain. Simulations were performed to provide flip angle normalized root-mean-squares error (FA-NRMSE) estimations for the 8∘ and the 180∘kT -point, SPINS, and GRAPE pulses. GRAPE pulses were tested experimentally with anatomical head scans at 7T.METHODSThe Gradient Ascent Pulse Engineering (GRAPE) algorithm was used to design parameterization-free RF and magnetic field gradient (MFG) waveforms for creating 8∘ excitation, up to 105∘ scalable refocusing and inversion, nonselectively across the brain. Simulations were performed to provide flip angle normalized root-mean-squares error (FA-NRMSE) estimations for the 8∘ and the 180∘kT -point, SPINS, and GRAPE pulses. GRAPE pulses were tested experimentally with anatomical head scans at 7T.As compared to kT -points and SPINS, GRAPE provided substantial improvement of excitation, refocusing, and inversion quality at off-resonance while at least preserving the same global FA-NRMSE performance. As compared to kT -points, GRAPE allowed for a substantial reduction of the pulse duration for the 8∘ excitation and the 105∘ refocusing.RESULTSAs compared to kT -points and SPINS, GRAPE provided substantial improvement of excitation, refocusing, and inversion quality at off-resonance while at least preserving the same global FA-NRMSE performance. As compared to kT -points, GRAPE allowed for a substantial reduction of the pulse duration for the 8∘ excitation and the 105∘ refocusing.Parameterization-free universal nonselective pTX-pulses were successfully computed using GRAPE. Performance gains as compared to kT -points were validated numerically and experimentally for three imaging protocols. In its current implementation, the computational burden of GRAPE limits its use to applications where pulse computations are not subject to time constraints.CONCLUSIONSParameterization-free universal nonselective pTX-pulses were successfully computed using GRAPE. Performance gains as compared to kT -points were validated numerically and experimentally for three imaging protocols. In its current implementation, the computational burden of GRAPE limits its use to applications where pulse computations are not subject to time constraints. In MRI at ultra-high field, the -point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission (pTX) and universal pulse techniques to create uniform excitation in a calibration-free manner. However, in these approaches, pulse duration is typically increased as compared to standard hard pulses, and excitation quality in regions exhibiting large resonance frequency offsets often suffer. This limitation is inherent to structure of -point or SPINS pulse, and likely can be mitigated using parameterization-free pulse design approaches. The Gradient Ascent Pulse Engineering (GRAPE) algorithm was used to design parameterization-free RF and magnetic field gradient (MFG) waveforms for creating excitation, up to scalable refocusing and inversion, nonselectively across the brain. Simulations were performed to provide flip angle normalized root-mean-squares error (FA-NRMSE) estimations for the and the -point, SPINS, and GRAPE pulses. GRAPE pulses were tested experimentally with anatomical head scans at 7T. As compared to -points and SPINS, GRAPE provided substantial improvement of excitation, refocusing, and inversion quality at off-resonance while at least preserving the same global FA-NRMSE performance. As compared to -points, GRAPE allowed for a substantial reduction of the pulse duration for the excitation and the refocusing. Parameterization-free universal nonselective pTX-pulses were successfully computed using GRAPE. Performance gains as compared to -points were validated numerically and experimentally for three imaging protocols. In its current implementation, the computational burden of GRAPE limits its use to applications where pulse computations are not subject to time constraints. |
| Author | Van Damme, L. Gras, V. Chambrion, T. Boulant, N. Mauconduit, F. |
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| Copyright | 2020 International Society for Magnetic Resonance in Medicine 2020 International Society for Magnetic Resonance in Medicine. Distributed under a Creative Commons Attribution 4.0 International License |
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| Keywords | GRAPE SPINS optimal control ultra high field RF pulse design parallel transmission kT-point k_T$-point |
| Language | English |
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In MRI at ultra‐high field, the
kT‐point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel... In MRI at ultra-high field, the -point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission... PurposeIn MRI at ultra‐high field, the kT‐point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel... In MRI at ultra-high field, the kT -point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel transmission... PurposeIn MRI at ultra‐high field, the $K_T$point and spiral nonselective (SPINS) pulse design techniques can be advantageously combined with the parallel... |
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| SubjectTerms | Algorithms Brain - diagnostic imaging Calibration Computational neuroscience Design parameters Excitation GRAPE Grapes kT‐point Magnetic Resonance Imaging Mathematics Medical imaging Neuroimaging Offsets optimal control Optimization and Control parallel transmission Parameterization Phantoms, Imaging Pulse duration Radio Waves RF pulse design Robustness (mathematics) SPINS ultra high field Vibration Waveforms |
| Title | Universal nonselective excitation and refocusing pulses with improved robustness to off‐resonance for Magnetic Resonance Imaging at 7 Tesla with parallel transmission |
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