Comparison of triple quantum (TQ) TPPI and inversion recovery TQ TPPI pulse sequences at 9.4 and 21.1 T
Purpose: Both sodium T-1 triple quantum (TQ) signal and T-1 relaxation pathways have a unique sensitivity to the sodium molecular environment. In this study an inversion recovery time proportional phase increment (IRTQTPPI) pulse sequence was investigated for simultaneous and reliable quantification...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
May 2024
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| In: |
NMR in biomedicine
Year: 2024, Volume: 37, Issue: 5, Pages: 1-15 |
| ISSN: | 1099-1492 |
| DOI: | 10.1002/nbm.5106 |
| Online Access: | Resolving-System, kostenfrei, Volltext: https://doi.org/10.1002/nbm.5106 Verlag, kostenfrei, Volltext: https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/10.1002/nbm.5106 
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| Author Notes: | Simon Reichert, Victor Schepkin, Dennis Kleimaier, Frank G. Zoellner, Lothar R. Schad |
MARC
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| 245 | 1 | 0 | |a Comparison of triple quantum (TQ) TPPI and inversion recovery TQ TPPI pulse sequences at 9.4 and 21.1 T |c Simon Reichert, Victor Schepkin, Dennis Kleimaier, Frank G. Zoellner, Lothar R. Schad |
| 264 | 1 | |c May 2024 | |
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| 520 | |a Purpose: Both sodium T-1 triple quantum (TQ) signal and T-1 relaxation pathways have a unique sensitivity to the sodium molecular environment. In this study an inversion recovery time proportional phase increment (IRTQTPPI) pulse sequence was investigated for simultaneous and reliable quantification of sodium TQ signal and bi-exponential T-1 relaxation times.Methods: The IRTQTPPI sequence combines inversion recovery TQ filtering and time proportional phase increment. The reliable and reproducible results were achieved by the pulse sequence optimized in three ways: (1) optimization of the nonlinear fit for the determination of both T-1-TQ signal and T-1 relaxation times; (2) suppression of unwanted signals by assessment of four different phase cycles; (3) nonlinear sampling during evolution time for optimal scan time without any compromises in fit accuracy. The relaxation times T-1 and T-2 and the TQ signals from IRTQTPPI and TQTPPI were compared between 9.4 and 21.1 T. The motional environment of the sodium nuclei was evaluated by calculation of correlation times and nuclear quadrupole interaction strengths.Results: Reliable measurements of the T-1-TQ signals and T-1 bi-exponential relaxation times were demonstrated. The fit parameters for all four phase cycles were in good agreement with one another, with a negligible influence of unwanted signals. The agar samples yielded normalized T-1-TQ signals from 3% to 16% relative to single quantum (SQ) signals at magnetic fields of both 9.4 and 21.1 T. In comparison, the normalized T-2-TQ signal was in the range 15%-35%. The TQ/SQ signal ratio was decreased at 21.1 T as compared with 9.4 T for both T-1 and T-2 relaxation pathways. The bi-exponential T-1 relaxation time separation ranged from 15 to 18 ms at 9.4 T and 15 to 21 ms at 21.1 T. The T-2 relaxation time separation was larger, ranging from 28 to 35 ms at 9.4 T and 37 to 40 ms at 21.1 T.Conclusion: The IRTQTPPI sequence, while providing a less intensive TQ signal than TQTPPI, allows a simultaneous and reliable quantification of both the T-1-TQ signal and T-1 relaxation times. The unique sensitivities of the T-1 and T-2 relaxation pathways to different types of molecular motion provide a deeper understanding of the sodium MR environment. | ||
| 650 | 4 | |a CHEMOTHERAPEUTIC RESPONSE | |
| 650 | 4 | |a COHERENCE DYNAMICS | |
| 650 | 4 | |a FILTERED NA-23 NMR | |
| 650 | 4 | |a IN-VIVO | |
| 650 | 4 | |a INTRACELLULAR NA CONTENT | |
| 650 | 4 | |a inversion recovery | |
| 650 | 4 | |a multi-quantum | |
| 650 | 4 | |a Na-23 (sodium) MRI | |
| 650 | 4 | |a NUCLEAR-MAGNETIC-RESONANCE | |
| 650 | 4 | |a PERFUSED RAT-HEART | |
| 650 | 4 | |a SINGLE-QUANTUM | |
| 650 | 4 | |a SODIUM MRI | |
| 650 | 4 | |a T-1 and T-2 relaxation | |
| 650 | 4 | |a THERMAL RELAXATION | |
| 650 | 4 | |a triple quantum (TQ) | |
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| 700 | 1 | |a Schad, Lothar R. |d 1956- |e VerfasserIn |0 (DE-588)1028817630 |0 (DE-627)731640241 |0 (DE-576)376271221 |4 aut | |
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