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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases

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Directional and inter-acquisition variability in diffusion-weighted imaging and editing for restricted diffusion.

Batuhan Gundogdu¹, Jay M Pittman¹, Aritrick Chatterjee¹

¹Department of Radiology, University of Chicago, Chicago, Illinois, USA.

Magnetic Resonance in Medicine

|July 21, 2022

Summary

This summary is machine-generated.

This study introduces a novel method for diffusion-weighted imaging (DWI) to improve prostate cancer detection. By filtering motion-induced signal loss, the technique enhances cancer conspicuity and reduces false positives.

Keywords:

ADC diffusion-weighted imaging inter-acquisition variation molecular motion restricted diffusion

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Area of Science:

Medical Imaging
Radiology
Biomedical Engineering

Background:

Diffusion-weighted imaging (DWI) is crucial for detecting prostate cancer.
Inter-acquisition variations and motion artifacts can reduce DWI accuracy.
Current methods may obscure signals from restricted diffusion areas.

Purpose of the Study:

To quantify inter-acquisition variation in DWI for prostate cancer.
To enhance cancer conspicuity by emphasizing restricted diffusion signals.
To mitigate effects of microscopic motion and magnetic field fluctuations on DWI.

Main Methods:

Studied ten patients with biopsy-proven prostate cancer using DWI.
Reconstructed DWI signal intensities to calculate inter-acquisition statistics.
Developed a method to detect and filter motion-induced signal loss using a cutoff value.
Calculated corrected apparent diffusion coefficient (ADC) maps using weighted sums of acquisitions.

Main Results:

Inter-acquisition variation significantly exceeds Rician noise and spatial variations.
The proposed method enhances cancer contrast.
Achieved high sensitivity with a low false positive rate.

Conclusions:

Motion-induced signal loss compromises conventional DWI signal averaging.
Filtering or weighting individual DWI acquisitions improves analysis.
The developed method offers a more robust approach to DWI for prostate cancer detection.