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Updated: Mar 8, 2026
Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
Technical Note: A safe, cheap, and easy-to-use isotropic diffusion MRI phantom for clinical and multicenter studies
Pim Pullens1, Piet Bladt2, Jan Sijbers2
1Department of Radiology, University Hospital Antwerp & University of Antwerp, 2650, Edegem, Belgium.
Purpose:
Since Diffusion Weighted Imaging (DWI) data acquisition and processing are not standardized, substantial differences in DWI derived measures such as Apparent Diffusion Coefficient (ADC) may arise which are related to the acquisition or MRI processing method, but not to the sample under study. Quality assurance using a standardized test object, or phantom, is a key factor in standardizing DWI across scanners.
Methods:
Current diffusion phantoms are either complex to use, not available in larger quantities, contain substances unwanted in a clinical environment, or are expensive. A diffusion phantom based on a polyvinylpyrrolidone (PVP) solution, together with a phantom holder, is presented and compared to existing diffusion phantoms for use in clinical DWI scans. An ADC vs. temperature calibration curve was obtained.
Results:
ADC of the phantom (808 to 857 ± 0.2 mm2 /s) is in the same range as ADC values found in brain tissue. ADC measurements are highly reproducible across time with an intra-class correlation coefficient of > 0.8. ADC as function of temperature (in Kelvin) can be estimated as ADCm(T)=[exp(-7.09)·exp-2903.81T-1293.55] with a total uncertainty (95% confidence limit) of ± 1.7%.
Conclusion:
We present an isotropic diffusion MRI phantom, together with its temperature calibration curve, that is easy-to-use in a clinical environment, cost-effective, reproducible to produce, and that contains no harmful substances.
Insights
A new, cost-effective polyvinylpyrrolidone (PVP) diffusion phantom offers a standardized solution for quality assurance in Diffusion Weighted Imaging (DWI). This reproducible phantom provides accurate Apparent Diffusion Coefficient (ADC) measurements, crucial for reliable MRI scans.
Area of Science:
- Medical Imaging
- Biophysics
- Materials Science
Background:
- Diffusion Weighted Imaging (DWI) acquisition and processing lack standardization, leading to variations in Apparent Diffusion Coefficient (ADC) measures.
- Quality assurance with standardized test objects (phantoms) is essential for consistent DWI across different MRI scanners.
Purpose of the Study:
- To present a novel, easy-to-use, and cost-effective diffusion phantom for clinical DWI quality assurance.
- To compare the new phantom with existing diffusion phantoms used in clinical settings.
Main Methods:
- Development of a diffusion phantom utilizing a polyvinylpyrrolidone (PVP) solution and a phantom holder.
- Acquisition of an Apparent Diffusion Coefficient (ADC) versus temperature calibration curve for the phantom.
Main Results:
- The phantom's ADC values (808-857 mm²/s) are comparable to those in brain tissue.
- ADC measurements demonstrated high reproducibility (intra-class correlation coefficient > 0.8).
- A temperature-dependent ADC calibration equation was established with a total uncertainty of ±1.7%.
Conclusions:
- The developed isotropic diffusion MRI phantom is user-friendly for clinical environments.
- It is cost-effective, reproducible, and contains no hazardous substances.
- The phantom facilitates standardized DWI quality assurance and reliable ADC measurements.
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