Water-extraction-with-phase-contrast-arterial-spin-tagging (WEPCAST) MRI was proposed recently as a non-invasive technique to assess blood-brain barrier (BBB) permeability to water. However, the reproducibility of this technique and cross-vendor reliability has not been reported. In this study, we harmonized WEPCAST technique across two major MRI vendors, Philips and Siemens and examined the test-retest reproducibility of the technique. The results showed that WEPCAST MRI can give a reliable assessment of BBB permeability with an excellent reproducibility.
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