The reference phantoms: voxel vs polygon

Area of Science:

• Medical Physics
• Radiological Protection
• Computational Modeling

Background:

• Current ICRP Publication 110 voxel phantoms have limited resolution for small tissues.
• This limitation affects dose coefficient accuracy, especially for weakly penetrating radiation.
• Separate models are used for thin target regions in organs.

Purpose of the Study:

• To convert ICRP Publication 110 phantoms to a high-quality polygon-mesh (PM) format.
• To include all source and target regions, including thin tissues (8-40 µm).
• To enhance accuracy of dose coefficient calculations.

Main Methods:

• Conversion of existing voxel phantoms to polygon-mesh format.
• Integration of detailed source and target regions.
• Development of high-resolution phantom models.

Main Results:

• Expected to yield similar dose coefficients for penetrating radiation compared to Publication 110 phantoms.
• Anticipated to provide more accurate dose coefficients for weakly penetrating radiation and small tissues.
• PM phantoms will be deformable for creating various postures.

Conclusions:

• The polygon-mesh phantom conversion project aims to improve ICRP dose coefficient calculations.
• Enhanced phantoms will offer greater accuracy for specific tissues and radiation types.
• The new format facilitates versatile applications, including accidental dose assessment.