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Development of alimentary tract organs for ICRP pediatric mesh-type reference computational phantoms
Chansoo Choi1, Bangho Shin1, Yeon Soo Yeom2
1Department of Nuclear Engineering, Hanyang University, Seoul, Republic of Korea.
Summary
New computational models of pediatric alimentary tract organs improve radiation dose calculations. These mesh-type reference computational phantoms (MRCPs) offer enhanced anatomical detail for more accurate dosimetry in children.
Area of Science:
- Medical Physics
- Radiological Protection
- Computational Modeling
Background:
- Accurate radiation dosimetry in pediatric populations is crucial for health risk assessment.
- Existing computational models may lack the anatomical detail necessary for precise dose estimation in children.
- International Commission on Radiological Protection (ICRP) guidelines necessitate updated models for pediatric dosimetry.
Purpose of the Study:
- To develop advanced alimentary tract organs for pediatric mesh-type reference computational phantoms (MRCPs).
- To enhance anatomical accuracy and include micrometre-scale regions for improved radiation dose calculations.
- To assess the dosimetric impact of these new models compared to existing ICRP computational phantoms.
Main Methods:
- Created new alimentary tract organ models (oral cavity, esophagus, stomach, small intestine, colon) for pediatric reference computational phantoms.
- Ensured preservation of original topology and shape while incorporating anatomical improvements.
- Computed organ doses and specific absorbed fractions for external (photons, electrons) and internal (electrons) exposures.
Main Results:
- Good agreement (within 10%) for external penetrating radiation doses, except for oral mucosa.
- Significant differences (up to ~8300-fold) observed for external weakly penetrating radiation exposures due to enhanced MRCP anatomy.
- Substantial differences (up to ~73,000-fold) found for internal electron exposures, attributed to geometric and target mass variations.
Conclusions:
- The developed pediatric MRCPs provide significant anatomical improvements over existing voxel-type reference computational phantoms (VRCPs).
- These enhanced models lead to considerable dosimetric differences, particularly for weakly penetrating and internal electron exposures.
- The new MRCPs are expected to improve the accuracy of radiation dose assessments in pediatric individuals.
