Introducing ICRP Publication 145:

Adult Mesh-type Reference Computational Phantoms

17 January 2023  |  Virtual Event

Over the next decade, ICRP will be hosting several Digital Events each year as we look to review and revise the System of Radiological Protection for the next generation.


Following the 2007 Recommendations (Publication 103), the Commission released the family series of the voxel-type reference computational phantoms (VRCPs) in Publication 110 (2009) and Publication 143 (2020) for dose coefficient calculations. The VRCPs based on CT images of real persons improve both anatomy and dosimetry against the old-fashion mathematical (or stylized) phantoms that had been used in dose coefficient calculations before 2007 Recommendations. Nevertheless, such voxel phantoms, composed of voxels of which size is fixed, still have limitations in representing some anatomical structures, especially those smaller and/or thinner than the voxel sizes of the phantoms; resultantly, the VRCPs cannot produce accurate/reliable dose coefficients for some exposure cases mainly for weakly penetrating radiations.

Acknowledging the limitations of the VRCPs and at the same time the emergence of the cutting-edge phantom technology based on a mesh format, the Commission established Task Group 103 to develop new mesh-type reference computational phantoms (MRCPs), which can overcome the limitations of the VRCPs and also serve as reference phantoms for the future dose coefficient calculations following the next general recommendations under preparation. The first report of the Task Group was approved in May 2019 and released as Publication 145 in 2020 to describe the development of the adult male and female MRCPs, counterparts of the adult VRCPs in Publication 110. The adult MRCPs were constructed by converting the adult VRCPs into a high-quality mesh format but also including all the source and target regions required for effective dose calculation, even the micrometer-thick source and target regions in the alimentary and respiratory tract organs, skin, and urinary bladder, assimilating the supplementary organ-specific stylized models. The MRCPs can be implemented directly (without voxelization) into general-purpose Monte Carlo particle transport codes for dose calculations, fully maintaining the advantages of the mesh geometry against the voxel geometry.

The webinar will give an outline of Publication 145. It will help understanding of the (1) general characteristics of the adult MRCPs with the anatomical and dosimetrical improvements as compared to the adult VRCPs and (2) provide basic guidance on how to download and use the phantoms, including the demonstration of implementing the MRCPs into three general-purpose Monte Carlo codes (i.e., Geant4, MCNP6, and PHITS).







Introduction to Mesh-type Reference Computational Phantoms
Chan Hyeong Kim (Hanyang University, Korea)




Development of Adult Mesh-type Reference Computational Phantoms
Yeon Soo Yeom (Yonsei University, Korea)




How to Download and Use Phantoms 
Chansoo Choi (University of Florida, USA)