Improved velocity-selective-inversion arterial spin labeling for cerebral blood flow mapping with 3D acquisition

Dapeng Liu, Feng Xu, Wenbo Li, Peter C. van Zijl, Doris D. Lin, Qin Qin

Research output: Contribution to journalArticle

Abstract

Purpose: To further optimize the velocity-selective arterial spin labeling (VSASL) sequence utilizing a Fourier-transform based velocity-selective inversion (FT-VSI) pulse train, and to evaluate its utility for 3D mapping of cerebral blood flow (CBF) with a gradient- and spin-echo (GRASE) readout. Methods: First, numerical simulations and phantom experiments were done to test the susceptibility to eddy currents and B1 field inhomogeneities for FT-VSI pulse trains with block and composite refocusing pulses. Second, the choices of the post-labeling delay (PLD) for FT-VSI prepared 3D VSASL were evaluated for the sensitivity to perfusion signal. The study was conducted among a young-age and a middle-age group at 3T. Both signal-to-noise ratio (SNR) and CBF were quantitatively compared with pseudo-continuous ASL (PCASL). The optimized 3D VSI-ASL was also qualitatively compared with PCASL in a whole-brain coverage among two healthy volunteers and a brain tumor patient. Results: The simulations and phantom test showed that composite refocusing pulses are more robust to both eddy-currents and B1 field inhomogeneities than block pulses. 3D VSASL images with FT-VSI preparation were acquired over a range of PLDs and PLD = 1.2 s was selected for its higher perfusion signal. FT-VSI labeling produced quantitative CBF maps with 27% higher SNR in gray matter compared to PCASL. 3D whole-brain CBF mapping using VSI-ASL were comparable to the corresponding PCASL results. Conclusion: FT-VSI with 3D-GRASE readout was successfully implemented and showed higher sensitivity to perfusion signal than PCASL for both young and middle-aged healthy volunteers.

Original languageEnglish (US)
JournalMagnetic resonance in medicine
DOIs
StateAccepted/In press - Jan 1 2020

Keywords

  • 3D GRASE acquisition
  • arterial spin labeling
  • cerebral blood flow
  • velocity-selective inversion

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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