Magnetization transfer in magnetic resonance fingerprinting

Tom Hilbert, Ding Xia, Kai Tobias Block, Zidan Yu, Riccardo Lattanzi, Daniel K. Sodickson, Tobias Kober, Martijn A. Cloos

    Research output: Contribution to journalArticle

    Abstract

    Purpose: To study the effects of magnetization transfer (MT, in which a semi-solid spin pool interacts with the free pool), in the context of magnetic resonance fingerprinting (MRF). Methods: Simulations and phantom experiments were performed to study the impact of MT on the MRF signal and its potential influence on T1 and T2 estimation. Subsequently, an MRF sequence implementing off-resonance MT pulses and a dictionary with an MT dimension, generated by incorporating a two-pool model, were used to estimate the fractional pool size in addition to the (Formula presented.), T1, and T2 values. The proposed method was evaluated in the human brain. Results: Simulations and phantom experiments showed that an MRF signal obtained from a cross-linked bovine serum sample is influenced by MT. Using a dictionary based on an MT model, a better match between simulations and acquired MR signals can be obtained (NRMSE 1.3% vs. 4.7%). Adding off-resonance MT pulses can improve the differentiation of MT from T1 and T2. In vivo results showed that MT affects the MRF signals from white matter (fractional pool-size ~16%) and gray matter (fractional pool-size ~10%). Furthermore, longer T1 (~1060 ms vs. ~860 ms) and T2 values (~47 ms vs. ~35 ms) can be observed in white matter if MT is accounted for. Conclusion: Our experiments demonstrated a potential influence of MT on the quantification of T1 and T2 with MRF. A model that encompasses MT effects can improve the accuracy of estimated relaxation parameters and allows quantification of the fractional pool size.

    Original languageEnglish (US)
    Pages (from-to)128-141
    Number of pages14
    JournalMagnetic resonance in medicine
    Volume84
    Issue number1
    DOIs
    StatePublished - Jul 1 2020

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    Keywords

    • fingerprinting
    • magnetization transfer
    • quantitative imaging
    • relaxation

    ASJC Scopus subject areas

    • Radiology Nuclear Medicine and imaging

    Cite this

    Hilbert, T., Xia, D., Block, K. T., Yu, Z., Lattanzi, R., Sodickson, D. K., Kober, T., & Cloos, M. A. (2020). Magnetization transfer in magnetic resonance fingerprinting. Magnetic resonance in medicine, 84(1), 128-141. https://doi.org/10.1002/mrm.28096