Affordable Dough-Based CT Phantoms Mimicking Human Tissue Radiodensity

Overview

This study presents a low-cost, customizable method for fabricating CT phantoms using dough made from common ingredients such as flour, salt, fat, and water. By adjusting ingredient ratios, the dough’s radiodensity can be tuned to mimic human tissue Hounsfield Units (HU), demonstrated by creating a liver phantom with realistic CT properties.

Background

CT phantoms that mimic human tissue are essential for research, imaging system calibration, quality control, and education. Commercial phantoms offer high realism but are costly and inflexible. Existing fabrication methods often require expensive materials and equipment, such as 3D printing with synthetic polymers. This study explores an accessible alternative using dough-based materials to replicate tissue radiodensity and anatomy affordably and reproducibly.

Data Highlights

Key Findings

• Dough radiodensity can be precisely tuned by varying salt concentration, with higher salt content increasing HU values.
• Replacing water with fat in dough formulations lowers HU, enabling simulation of fatty tissues.
• Citric acid addition provides preservation benefits without compromising dough structure significantly.
• Different CT reconstruction kernels (B20f, B31f, B50f, B80f) affect HU measurements, highlighting the need for standardized imaging protocols.
• A 3D-printed liver mold filled with appropriately composed dough successfully replicated anatomical shape and CT radiodensity of healthy liver tissue.
• The dough-based phantoms maintained shape stability and were easy to fabricate using common kitchen ingredients.

Clinical Implications

This affordable and customizable dough-based phantom fabrication method offers a practical alternative for institutions lacking access to expensive commercial phantoms or 3D printing resources. It enables researchers and educators to create anatomically realistic CT phantoms with tunable radiodensity for calibration, quality control, and training purposes. The approach facilitates repeated use and modification, potentially accelerating experimental workflows and educational activities.

Conclusion

Dough-based CT phantoms made from simple, inexpensive ingredients can effectively mimic human tissue radiodensity and anatomy. This method provides a versatile, low-cost solution for producing customizable phantoms suitable for diverse clinical and research applications.

References

1. Erler-Zimmer GmbH & Co.KG and True Phantom Solutions Inc. -- Commercial CT Phantoms
2. Segmentation Algorithm Evaluations and Brain Shift Studies -- Skull Phantoms Applications
3. Synthetic Polymers and Gypsum for Phantom Fabrication -- Materials Overview
4. Deep Learning Liver Segmentation and 3D Printing -- Liver Phantom Creation
5. Healthy Liver Tissue Radiodensity Range -- Clinical CT Values