Comparison of pulsed and pseudocontinuous arterial spin-labeling for measuring 
CO2-induced cerebrovascular reactivity

Tancredi, Felipe B.; Gauthier, Claudine; Madjar, Cécile; Bolar, Divya S.; Fisher, Joseph A.; Wang, Danny J. J.; Hoge, Richard D.

doi:10.1002/jmri.23658

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Comparison of pulsed and pseudocontinuous arterial spin-labeling for measuring CO2-induced cerebrovascular reactivity

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Tancredi, F. B., Gauthier, C., Madjar, C., Bolar, D. S., Fisher, J. A., Wang, D. J. J., et al. (2012). Comparison of pulsed and pseudocontinuous arterial spin-labeling for measuring CO2-induced cerebrovascular reactivity. Journal of Magnetic Resonance Imaging, 36(2), 312-321. doi:10.1002/jmri.23658.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-77F4-0

Abstract

PURPOSE: To compare the performance of pulsed and pseudocontinuous arterial spin-labeling (PASL and pCASL) methods in measuring CO(2) -induced cerebrovascular reactivity (CVR).
MATERIALS AND METHODS: Subjects were scanned using both ASL sequences during a controlled hypercapnia procedure and visual stimulation. CVR was computed as the percent CO(2) -induced increase in cerebral blood flow (Δ%CBF) per mmHg increase in end-tidal PCO(2) . Visually evoked responses were expressed as Δ%CBF. Resting CBF and temporal signal-to-noise ratio were also computed. Regionally averaged values for the different quantities were compared in gray matter (GM) and visual cortex (VC) using t-tests.
RESULTS: Both PASL and pCASL yielded comparable respective values for resting CBF (56 ± 3 and 56 ± 4 mL/min/100g) and visually evoked responses (75 ± 5% and 81 ± 4%). Values of CVR determined using pCASL (GM 4.4 ± 0.2, VC 8 ± 1 Δ%CBF/mmHg), however, were significantly higher than those measured using PASL (GM 3.0 ± 0.6, VC 5 ± 1 Δ%CBF/mmHg) in both GM and VC. The percentage of GM voxels in which statistically significant hypercapnia responses were detected was also higher for pCASL (27 ± 5% vs. 16 ± 3% for PASL).
CONCLUSION: pCASL may be less prone to underestimation of CO(2) -induced flow changes due to improved label timing control.