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  CEST imaging at 9.4 T using adjusted adiabatic spin‐lock pulses for on‐ and off‐resonant T1⍴‐dominated Z‐spectrum acquisition

Herz, K., Gandhi, C., Schuppert, M., Deshmane, A., Scheffler, K., & Zaiss, M. (2019). CEST imaging at 9.4 T using adjusted adiabatic spin‐lock pulses for on‐ and off‐resonant T1⍴‐dominated Z‐spectrum acquisition. Magnetic Resonance in Medicine, 81(1), 275-290. doi:10.1002/mrm.27380.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-1132-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-930D-A
Genre: Journal Article

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Herz, K1, 2, Author              
Gandhi, C1, 2, Author              
Schuppert, M1, 2, Author              
Deshmane, A1, 2, Author              
Scheffler, K1, 2, Author              
Zaiss, M1, 2, Author              
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Purpose The CEST experiment, with its correlation to rare proton species that are in exchange with the water pool, is very similar to the off‐resonant water spin‐lock (SL) experiment. In particular, low‐power SL Z‐spectrum acquisition allows insight into T1ρ and exchange effects with decreased direct water saturation. Because the available SL methods either require high B1 power or are instable in the presence of strong B1 and B0 inhomogeneity present at ultra‐high fields, the goal of this study was to find a robust adiabatic SL pulse for on‐ and off‐resonant application in the human brain at 9.4 T. Methods A series of Bloch simulations were used to find optimal pulse shape parameters of an adjusted hyperbolic secant pulse applicable in the low power regime typically used for exchange‐weighted SL experiments. The optimized pulse was implemented and tested in phantom and in vivo experiments on a 9.4 T human scanner for on‐ and off‐resonant T1ρ‐ and Z‐spectrum measurements. Results The simulation yielded a feasible pulse shape, which yielded robust images, less sensitivity to B1 and B0 inhomogeneity compared with previous SL approaches and less direct water saturation, as well as a higher chemical exchange weighting compared with conventional CEST approaches. Conclusion By adapting a pulse shape for low‐power SL experiments, we were able to acquire robust on‐ and off‐resonant adiabatic SL prepared images in vivo at 9.4 T. This development leads directly to SL Z‐spectrum acquisition, beneficial for chemical‐exchange‐weighted MRI.

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 Dates: 2018-092019-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/mrm.27380
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 81 (1) Sequence Number: - Start / End Page: 275 - 290 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149