Construction of a temperature-controlled diffusion phantom for quality control of diffusion measurements

Area of Science:

• Medical Imaging
• Diffusion MRI Physics

Background:

• Diffusion MRI parameter precision is crucial for accurate biological tissue characterization.
• Current methods for comparing diffusion sequences lack standardized calibration tools.

Purpose of the Study:

• To develop a temperature-controlled diffusion phantom with defined properties.
• To enable precise comparison and optimization of diffusion imaging sequences.
• To improve the accuracy of experimentally derived diffusion parameters.

Main Methods:

• Constructed a temperature-stabilized diffusion phantom using hydrophobic polyethylene fibers.
• Investigated reproducibility and temperature dependence of diffusion parameters.
• Compared measurement precision of different diffusion-encoding schemes using bootstrap analysis and simulations.

Main Results:

• The diffusion phantom demonstrated high reproducibility and significant temperature dependence.
• Simulations accurately reproduced the observed temperature effects, validating the phantom's design.
• Exemplary application showed the phantom's utility in optimizing diffusion sequences for measurement precision.

Conclusions:

• The developed diffusion phantom enhances comparison and quality control of diffusion sequences.
• Accurate temperature control is essential for reproducible calibration measurements.
• The phantom serves as a valuable calibration tool for clinical diffusion MRI studies.