Keywords: CEST / APT / NOE, Analysis/Processing, B1 correction
Motivation: For Chemical Exchange Saturation Transfer (CEST) imaging of human glioma at 7T, the contrast corresponding to the tumor area is often masked by the effects of B1+ inhomogeneity.
Goal(s): Retrospective B1+ inhomogeneity correction using CEST data acquired using circularly polarized (CP) mode at multiple B1 levels can potentially reduce the image inhomogeneity.
Approach: Using both spline and linear interpolation methods, contrast- and Z-spectrum-based corrections are tested on 7T CEST data from glioma patients.
Results: The interpolation-based retrospective B1+ inhomogeneity correction has shown mixed effects for the CEST contrast.
Impact: Retrospective correction for B1+ inhomogeneity has limited effects in improving CEST image quality acquired using CP mode at 7T, thus presenting a demand for alternative methods to archive homogeneous CEST contrast at time of acquisition.
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