1. Ladd ME, Bachert P, Meyerspeer M, et al. Pros and cons of
ultra-high-field MRI/MRS for human application. Prog NMR
Spectro. 2018;109:1-50.
2. Pauly JM, Nishimura DG, Macovski A. A k-space analysis of
small-tip angle excitation. J Magn Reson. 1989;81:43-56.
3. Katscher U, Börnert P, Leussler C, van den Brink JS. Transmit
SENSE. Magn Reson Med. 2003;49:144-150.
4. Gras V, Vignaud A, Amadon A, Le Bihan D, Boulant N. Univer-
sal pulses: a new concept for calibration-free parallel transmis-
sion. Magn Reson Med. 2017;77:635-643.
5. Gras V, Mauconduit F, Vignaud A, et al. Design of universal
parallel-transmit refocusing kT-point pulses and application to
3D T2 -weighted imaging at 7T. Magn Reson Med. 2018;80:53-65.
6. Gras V, Pracht ED, Mauconduit F, Le Bihan D, Stöcker T,
Boulant N. Robust nonadiabatic T2 preparation using universal
parallel-transmit kT -point pulses for 3D FLAIR imaging at 7T.
Magn Reson Med. 2019;81:3202-3208.
7. Aigner CS, Dietrich S, Schmitter S. Three-dimensional static and
dynamic parallel transmission of the human heart at 7T. NMR
Biomed. 2021;34:e4450.
8. Le Ster C, Mauconduit F, Massire A, Boulant N, Gras V. Stan-
dardized universal pulse: a fast RF calibration approach to
improve flip angle accuracy in parallel transmission. Magn
Reson Med. 2022;87:2839-2850.
9. Herrler J, Liebig P, Gumbrecht R, et al. Fast online-customized
(FOCUS) parallel transmission pulses: a combination of uni-
versal pulses and individual optimization. Magn Reson Med.
2021;85:3140-3153.
10. Gras V, Boland M, Vignaud A, et al. Homogeneous non-selective
and slice-selective parallel-transmit excitations at 7 tesla with
universal pulses: a validation study on two commercial RF coils.
PLoS One. 2017;12:e0183562.
11. Vaughan JT, Garwood M, Collins CM, et al. 7T vs. 4T: RF power,
homogeneity, and signal-to-noise comparison in head images.
Magn Reson Med. 2001;46:24-30.
12. Lee J, Gebhardt M, Wald LL, Adalsteinsson E. Local SAR
in parallel transmission pulse design. Magn Reson Med.
2012;67:1566-1578.
13. Medical Electrical Equipment—Particular Requirements for the
Safety of Magnetic Resonance Equipment for Medical Diagnosis.
International Electrotechnical Commission; 2010.
14. Graesslin I, Homann H, Biederer S, et al. A specific absorp-
tion rate prediction concept for parallel transmission MR. Magn
Reson Med. 2012;68:1664-1674.
15. Eichfelder G, Gebhardt M. Local specific absorption rate con-
trol for parallel transmission by virtual observation points. Magn
Reson Med. 2011;66:1468-1476.
16. Mugler JP, Brookeman JR. Three dimensional
magnetization-prepared rapid gradient-echo imaging (3D
MP-RAGE). Magn Reson Med. 1990;15:152-157.
17. Williams SN, Allwood-Spiers S, McElhinney P, et al. A nested
eight-channel transmit array with open-face concept for human
brain imaging at 7 tesla. Frontier Phys. 2021;9:701330.
18. Fautz H-P, Vogel M, Gross P, Kerr AB, Zhu Y. B1 mapping of coil
arrays for parallel transmission. Proceedings of the 16th Annual
Meeting of ISMRM, ISMRM, Toronto, 2008:1247.
19. Boulant N, Gras V, Amadon A, Luong M, Ferrand G, Vignaud A.
Workflow proposal for defining SAR safety margins in parallel
transmission. Proceedings of the 26th Annual Meeting of ISMRM,
ISMRM, Paris, 2018:295.
20. Malik SJ, Keihaninejad S, Hammers A, Hajnal JV. Tailored exci-
tation in 3D with spiral nonselective (SPINS) RF pulses. Magn
Reson Med. 2012;67:1303-1315.15222594, 0, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/mrm.29569 by NHS Education for Scotland NES, Edinburgh Central Office, Wiley Online Library on [17/01/2023]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License
HERRLER et al. 13
21. Setsompop K, Wald LL, Alagappan V, Gagoski BA, Adalsteins-
son E. Magnitude least squares optimization for parallel radio
frequency excitation design demonstrated at 7 tesla with eight
channels. Magn Reson Med. 2008;59:908-915.
22. Cloos MA, Boulant N, Luong M, et al. kT-points: short
three-dimensional tailored RF pulses for flip-angle homogeniza-
tion over an extended volume. Magn Reson Med. 2012;67:72-80.
23. Van Damme L, Mauconduit F, Chambrion T, Boulant N, Gras V.
Universal nonselective excitation and refocusing pulses with
improved robustness to off-resonance for magnetic resonance
imaging at 7 tesla with parallel transmission. Magn Reson Med.
2021;85:678-693.
24. Majewski K. Simultaneous optimization of radio frequency
and gradient waveforms with exact hessians and slew rate
constraints applied to kT-points excitation. J Magn Reson.
2021;326:106941.
25. Paez A, Gu C, Cao Z. Robust RF shimming and small-tip-angle
multispoke pulse design with finite-difference regularization.
Magn Reson Med. 2021;86:1472-1481.
26. Yarnykh VL. Actual flip-angle imaging in the pulsed steady
state: a method for rapid three-dimensional mapping of
the transmitted radiofrequency field. Magn Reson Med.
2007;57:192-200.
27. Eggenschwiler F, Kober T, Magill AW, Gruetter R, Marques JP.
SA2RAGE: a new sequence for fast B1+-mapping. Magn Reson
Med. 2012;67:1609-1619.
28. Nehrke K, Börnert P. DREAM-a novel approach for
robust, ultrafast, multislice B1+ mapping. Magn Reson Med.
2012;68:1517-1526.
29. Padormo F, Hess AT, Aljabar P, et al. Large dynamic range
relative B 1+ mapping. Magn Reson Med. 2016;76:490-499.
30. Hess AT, Dragonu I, Chiew M. Accelerated calibrationless paral-
lel transmit mapping using joint transmit and receive low-rank
tensor completion. Magn Reson Med. 2021;86:2454-2467.
31. Plumley A, Watkins L, Treder M, Liebig P, Murphy K,
Kopanoglu E. Rigid motion-resolved prediction using deep
learning for real-time parallel-transmission pulse design. Magn
Reson Med. 2022;87:2254-2270.
32. Ianni JD, Cao Z, Grissom WA. Machine learning RF shimming:
prediction by iteratively projected ridge regression. Magn Reson
Med. 2018;80:1871-1881.
33. Shin D, Kim Y, Oh C, et al. Deep reinforcement learning-
designed radiofrequency waveform in MRI. Nat Mach Intel.
2021;3:985-994.
34. Vinding MS, Aigner CS, Schmitter S, Lund TE. Deep-
Control: 2DRF pulses facilitating inhomogeneity and B0
off-resonance compensation in vivo at 7 T. Magn Reson Med.
2021;85:3308-3317.
35. Macounduit F, Gras V, Vignaud A, Boulant N. MetaPulse2D:
methodology to enable universal slice specific spokes pulses in
parallel transmission. Proceedings of the 30th Annual Meeting of
ISMRM, ISMRM, London, 2022:454.
36. Herrler J, Liebig P, Majewski K, et al. Neural network-supported
fast online-customized (FOCUS) parallel transmit (pTx) pulses
for slice-selective, large tip angle excitation. Proceedings of the
30th Annual Meeting of ISMRM, ISMRM, London, 2022:3312.
37. Hennig J, Nauerth A, Friedburg H. RARE imaging: a fast
imaging method for clinical MR. Magn Reson Med. 1986;
3:822-833.
38. Malik SJ, Beqiri A, Padormo F, Hajnal JV. Direct signal control
of the steady-state response of 3D-FSE sequences. Magn Reson
Med. 2015;73:951-963.
39. Beqiri A, Hoogduin H, Sbrizzi A, Hajnal JV, Malik SJ.
Whole-brain 3D FLAIR at 7T using direct signal control. Magn
Reson Med. 2018;80:1533-1545.
40. Herrler J, Endres J, Tomi-Tricot R, et al. Direct signal con-
trol combined with dymanic, fast online customized (FOCUS),
parallel transmit excitation pulses for TSE at 7 Tesla. Proceed-
ings of the 30th Annual Meeting of ISMRM, ISMRM, London,
2022:3313.
41. Tomi-Tricot R, Gras V, Thirion B, et al. SmartPulse, a machine
learning approach for calibration-free dynamic RF shimming:
preliminary study in a clinical environment. Magn Reson Med.
2019;82:2016-2031