Authors
Angeliki Stamatelatou, Carlijn Tenbergen, Sahar Nassirpour, Paul Chang, Jack van Asten, Arend Heerschap, Tom Scheenen
Published in
Magma (New York, N.Y.). Sep 11, 2025. Epub Sep 11, 2025.
Abstract
To improve B0 field homogeneity in prostate MR imaging and spectroscopy using a custom-designed 16-channel external local shim coil array.
In vivo prostate imaging was performed in seven healthy volunteers (mean age: 40.7 years) without bowel preparation. A simulation study determined the most robust configuration of the add-on shim coil together with shim coils from the MR system. The combination of the add-on shim coil array with 1st-order shims of the MR scanner was used and compared to the MR system's reference standard of conventional 1st and 2nd-order shimming. Performance was evaluated using the standard deviation (SD) of off-resonance frequencies (ΔB0) from B0-maps, the distortion of diffusion-weighted images (DWI) by the Dice similarity coefficient (DSC) with reference to T2W images, and the citrate linewidths of 1H-MR spectroscopic imaging (1H-MRSI) of the prostate.
Overall, improvements were made with the combination of coils, with DSC rising from 0.90 ± 0.02 to 0.92 ± 0.02 (p = 0.01), a reduction in the SD of ΔB0 from 18.5 ± 4.7 Hz to 16.5 ± 3.6 Hz, and a decrease in citrate linewidths from 8.3 ± 5.7 Hz to 7.9 ± 3.6 Hz (p = 0.018), all compared to the reference standard of conventional 1st and 2nd-order shimming.
A dedicated external shim coil array can improve B0 homogeneity in the prostate, enhancing image quality and precision in multi-parametric MRI.
PMID:
40931281
Bibliographic data and abstract were imported from PubMed on 11 Sep 2025.
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