Home > Publications database > Hybrid B 1 + -shimming and gradient adaptions for improved pseudo-continuous arterial spin labeling at 7 Tesla. > print

001     170385
005     20240229133711.0
024 7 _ |a 10.1002/mrm.28982
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024 7 _ |a pmid:34411335
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024 7 _ |a 0740-3194
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024 7 _ |a 1522-2594
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037 _ _ |a DKFZ-2021-01894
041 _ _ |a English
082 _ _ |a 610
100 1 _ |a Meixner, Christian R
|0 0000-0003-2799-6277
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245 _ _ |a Hybrid B 1 + -shimming and gradient adaptions for improved pseudo-continuous arterial spin labeling at 7 Tesla.
260 _ _ |a New York, NY [u.a.]
|c 2022
|b Wiley-Liss
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500 _ _ |a #LA:E020# / 2022 Jan;87(1):207-219
520 _ _ |a To improve pseudo-continuous arterial spin labeling (pcASL) at 7T by exploiting a hybrid homogeneity- and efficiency-optimized B 1 + -shim with adapted gradient strength as well as background suppression.The following three experiments were performed at 7T, each employing five volunteers: (1) A hybrid (ie, homogeneity-efficiency optimized) B 1 + -shim was introduced and evaluated for variable-rate selective excitation pcASL labeling. Therefore, B 1 + -maps in the V3 segment and time-of-flight images were acquired to identify the feeding arteries. For validation, a gradient-echo sequence was applied in circular polarized (CP) mode and with the hybrid B 1 + -shim. Additionally, the gray matter (temporal) signal-to-noise ratio (tSNR) in pcASL perfusion images was evaluated. (2) Bloch simulations for the pcASL labeling were conducted and validated experimentally, with a focus on the slice-selective gradients. (3) Background suppression was added to the B 1 + -shimmed, gradient-adapted 7T sequence and this was then compared to a matched sequence at 3T.The B 1 + -shim improved the signal within the labeling plane (23.6%) and the SNR/tSNR increased (+11%/+11%) compared to its value in CP mode; however, the increase was not significant. In accordance with the simulations, the adapted gradients increased the tSNR (35%) and SNR (45%) significantly. Background suppression further improved the perfusion images at 7T, and this protocol performed as well as a resolution-matched protocol at 3T.The combination of the proposed hybrid B 1 + -phase-shim with the adapted slice-selective gradients and background suppression shows great potential for improved pcASL labeling under suboptimal B 1 + conditions at 7T.
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650 _ 7 |a 7 Tesla
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650 _ 7 |a B1 shimming
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650 _ 7 |a VERSE
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650 _ 7 |a pTx
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650 _ 7 |a pcASL
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650 _ 7 |a ultra-high field strengths
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700 1 _ |a Eisen, Christian K
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700 1 _ |a Schmitter, Sebastian
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700 1 _ |a Müller, Max
|0 0000-0001-6731-9583
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700 1 _ |a Herrler, Jürgen
|0 0000-0002-4620-8216
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700 1 _ |a Hensel, Bernhard
|b 5
700 1 _ |a Dörfler, Arnd
|b 6
700 1 _ |a Uder, Michael
|b 7
700 1 _ |a Nagel, Armin
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