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Improved DTI-Based Skeletal Muscle Architecture Estimation via Diffusion Weighted Image Denoising and First
Roberto A Pineda Guzman1, Carly A Lockard1, Xingyu Zhou1,2
1Carle Clinical Imaging Research Program, Stephens Family Clinical Research Institute, Urbana, Illinois, USA.
NMR in Biomedicine
|July 15, 2025
Summary
Image smoothing techniques improve the accuracy of diffusion tensor imaging (DTI) tractography for estimating skeletal muscle architecture. These methods reduce errors caused by noise, leading to more reliable muscle fiber curvature measurements.
Area of Science:
- Biomedical Imaging
- Musculoskeletal Research
- Diffusion Tensor Imaging (DTI)
Background:
- Skeletal muscle architecture is crucial for muscle function and is often assessed using DTI tractography.
- Noise in DTI images leads to inaccurate muscle architecture estimations, particularly at low signal-to-noise ratios (SNRs).
- Current denoising methods' effects on skeletal muscle DTI are not well-established, and alternative strategies are underexplored.
Purpose of the Study:
- To evaluate the impact of anisotropic image smoothing and first eigenvector field smoothing on DTI-based muscle architecture accuracy.
- To compare these smoothing techniques against traditional denoising methods using simulated and human skeletal muscle data.
- To determine the effectiveness of these methods in improving fascicle curvature and fiber-tract estimates at varying SNRs.
Main Methods:
- Simulated DTI images of a model muscle were generated to quantify the accuracy of different smoothing techniques at various SNRs.
- Anisotropic image smoothing, threshold principal component analysis (PCA)-based denoising, and first eigenvector field smoothing were applied.
- The methods were subsequently tested on a human skeletal muscle DTI dataset.
Main Results:
- In simulations, anisotropic image smoothing and first eigenvector field smoothing significantly reduced deviations from noise-free data.
- Both smoothing methods improved the accuracy of fascicle curvature estimates in the simulated dataset.
- In the human dataset, smoothing techniques decreased fiber-tract curvature compared to raw DTI data.
Conclusions:
- Anisotropic image smoothing and first eigenvector field smoothing enhance the accuracy of DTI tractography for skeletal muscle architecture.
- These smoothing strategies offer a viable approach to mitigate noise-induced errors in muscle DTI analysis.
- The findings support the use of these smoothing methods for more reliable assessments of muscle architecture.
