Precision of liver and pancreas apparent diffusion coefficients using motion-compensated gradient waveforms in DWI

Area of Science:

• Medical Imaging
• Radiology
• Biophysics

Background:

• Diffusion-weighted imaging (DWI) is crucial for liver and pancreas assessment.
• Cardiovascular motion causes signal dropouts, affecting image precision.
• Optimized motion-compensated gradient waveforms aim to reduce these artifacts.

Purpose of the Study:

• To evaluate the precision of motion-compensated DWI.
• To compare its apparent diffusion coefficient (ADC) repeatability and reproducibility against conventional DWI.
• To assess its effectiveness in liver and pancreas imaging.

Main Methods:

• Prospective, single-center study with 3T MRI scans.
• Subjects underwent two DWI series: conventional and motion-compensated.
• ADC values were measured by three readers; statistical analysis included ANOVA and Bland-Altman.

Main Results:

• Motion-compensated DWI showed superior repeatability coefficients for both liver and pancreas in healthy participants.
• Reproducibility coefficients were also significantly better with motion-compensated DWI.
• Improved repeatability was observed in patients with liver metastases using motion-compensated DWI.

Conclusions:

• Motion-compensated DWI enhances the precision of ADC measurements.
• This technique offers improved repeatability and reproducibility compared to conventional DWI.
• It holds promise for more accurate liver and pancreas imaging.