关键词：扩散成像 DIM 磁场检测
ISMRM 2025 Abstract #4049
DIM: A Diffusion Instability Measure
Authors
Tim Schmidt1,2 and Zoltan Nagy2
1ETH Zurich, Institute for Biomedical Engineering, Zurich, Switzerland,
2Laboratory for Social and Neural Systems Research (SNS), University of Zurich, Zurich, Switzerland
We developed and tested a diffusion instability measure (DIM) that is sensitive to factors affecting image quality, such as magnetic field monitoring, f0 stabilization, TE, gradient strengths, making it a promising tool for routine diffusion MRI quality assurance.
DIM values of FM datasets with various b-values are shown with 2nd&3rd order spherical harmonics reconstructions, calculated over diffusion directions 1-63 (plots 1&2) and 2-64 (plots 3&4).
A magnification of the first 4 scatterplots is at the top left.
The inset shows slice 30 (b=4000 s/mm²), where the 1st DWI (left) has artifacts, but the 22nd DWI (right) is artifact-free, effecting the value of DIM.
Plots 5–10 show DIM values for Philips without FM and Cima.X with matched/minimum TR&TEs.
Correlation coefficient matrices:
Top two rows: Matrices calculated for diffusion directions 2 to 64, shown for increasing b-values with 2nd (first row) and 3rd (second row) spherical harmonics fits.
3rd and 4th rows: Same visualization for Philips and Siemens datasets without field monitoring.
5th and 6th rows: Siemens dataset with minimal TR/TE.
7th row: For b-value 1000 with alternating on/off f0 stabilization.
Note: rows are windowed differently.
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