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Self-Derived Dynamic Field Map Estimation and Correction in CEST MRI.

Sultan Z Mahmud¹, Kevin Ju^1,2, Jianping Xu¹

¹Department of Radiology, Johns Hopkins University, Baltimore, Maryland, USA.

Magnetic Resonance in Medicine

|May 21, 2026

Summary

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A new dynamic field map correction method improves chemical exchange saturation transfer (CEST) MRI accuracy, especially during subject motion. This technique enhances CEST measurements without requiring extra scans, leading to more reliable results.

Area of Science:

Magnetic Resonance Imaging
Biomedical Engineering

Background:

Chemical Exchange Saturation Transfer (CEST) MRI is sensitive to B0 field fluctuations.
Subject motion during MRI scans can induce significant B0 variations, compromising measurement accuracy.
Existing methods for B0 correction often require additional scans or complex post-processing.

Purpose of the Study:

To develop and validate a self-derived, dynamic B0 field map (∆B0) estimation and correction method for CEST MRI.
To improve CEST measurement accuracy, particularly in the presence of subject motion, without necessitating additional scans.
To integrate dynamic ∆B0 correction directly into rosette-based CEST acquisition.

Main Methods:

Dynamic ∆B0 maps were generated by segmenting rosette k-space data from acquired CEST images.

Keywords:

APT B0 field inhomogeneity CEST motion rosette sampling

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The accuracy of the rosette-derived ∆B0 maps was validated against standard dual-echo Cartesian GRE ∆B0 maps.

The method was tested in healthy volunteers at 3T, with and without induced motion, to assess its utility for CEST MRI.

Main Results:

Dynamic ∆B0 correction significantly improved CEST measurements compared to static correction, especially under motion conditions.
Mean differences in global Z-spectra between motion-free and motion-corrupted scans were minimal with dynamic correction (0.23% ± 0.06%) but substantial with static correction (3.10% ± 0.70%).
Dynamic ∆B0-corrected APTw values in motion correlated highly (R ≥ 0.96) with motion-free values, unlike static-corrected values (R ≤ 0.02).

Conclusions:

The proposed method enables dynamic ∆B0 mapping within rosette-CEST MRI acquisitions.
This approach enhances the accuracy of CEST measurements by correcting for motion-induced B0 fluctuations.
The dynamic correction eliminates the need for additional scans or separate alignment of ∆B0 and saturation spectra, streamlining the process.