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Journal Articles

PARaDIM; A PHITS-based Monte Carlo tool for internal dosimetry with tetrahedral mesh computational phantoms

Carter, L. M.*; Crawford, T. M.*; Sato, Tatsuhiko; Furuta, Takuya; Choi, C.*; Kim, C. H.*; Brown, J. L.*; Bolch, W. E.*; Zanzonico, P. B.*; Lewis, J. S.*

Journal of Nuclear Medicine, 60(12), p.1802 - 1811, 2019/12

 Times Cited Count:2 Percentile:55.17(Radiology, Nuclear Medicine & Medical Imaging)

Voxel human phantoms have been used for internal dose assessment. More anatomically accurate representation become possible for skins or layer tissues owing to recent developments of advanced polygonal mesh-type phantoms and thus internal dose assessment using those advanced phantoms are desired. However, the Monte Carlo transport calculation by implementing those phantoms require an advanced knowledge for the Monte Carlo transport codes and it is only limited to experts. We therefore developed a tool, PARaDIM, which enables users to conduct internal dose calculation with PHITS easily by themselves. With this tool, a user can select tetrahedral-mesh phantoms, set radionuclides in organs, and execute radiation transport calculation with PHITS. Several test cases of internal dosimetry calculations were presented and usefulness of this tool was demonstrated.

Journal Articles

Comparison of dosimetry by the realistic patient head phantom and by the patient's brain, and the JCDS calculation; A Clinical dosimetry study

Endo, Kiyoshi*; Matsumura, Akira*; Yamamoto, Tetsuya*; Nose, Tadao*; Yamamoto, Kazuyoshi; Kumada, Hiroaki; Kishi, Toshiaki; Torii, Yoshiya; Kashimura, Takanori*; Otake, Shinichi*

Research and Development in Neutron Capture Therapy, p.425 - 430, 2002/09

Using the Rapid Prototyping Technique, we produced a realistic phantom as a formative model of a patient head. This realistic phantom will contribute to verification of our planning system. However, cross-correlation among the calculations using the JAERI Computational Dosimetry System (JCDS), the realistic phantom, and the in vivo measurements were not fully completed because of the difficulty involved in modeling a post-surgical brain and a thermal neutron shield. The experimental simulation technique using the realistic phantom is a useful tool for more reliable dose planning for the intraoperative BNCT.

Oral presentation

A Computational method for voxel to polygon mesh conversion of anatomic computational human phantoms

Brown, J. L.*; Furuta, Takuya; Bolch, W. E.*

no journal, , 

Computational human phantoms in a voxelized format have been used in radiation dose assessments with Monte Carlo radiation transport codes. Recently, the transport in human computational phantoms represented by polygon mesh structure becomes possible with the several Monte Carlo codes. Individual organs and body circumferences are better represented by mesh-type human phantom than by voxel-based phantoms. Tremendous number of voxel-based phantoms have been developed from CT or MR data, and thus there is a need for conversion of existing models to mesh-type formats to allow this additional benefit. We therefore developed an algorithm which accurately converts computational voxelized human phantoms into a polygon-mesh format by detecting boundaries of individual organs. The converted polygon-mesh phantoms can be visualized using CAD software as well as they can be used for radiation transport calculation in Monte Carlo codes.

Oral presentation

Developments toward radiation dose assessment using next generation polygon human phantoms

Furuta, Takuya; Sato, Kaoru; Takahashi, Fumiaki

no journal, , 

Voxel-based computational human phantoms have been used for radiation dose assessment with Monte Carlo radiation transport simulation codes. However, development of polygon-based computation humans becomes popular due to advantages on description of thin layer tissues and small organs. International Commission on Radiological Protection (ICRP) also announced to adopt polygon human phantoms as the reference phantoms. We therefore introduced a function to treat tetrahedral-mesh geometry, a type of polygon geometry, into Particle and Heavy Ion Transport code Systems (PHITS). Along this implementation, we also developed an efficient transport algorithm with tetrahedral-mesh geometry, which allows to reduce the computational time to 1/4 of the voxel-mesh calculation using the same precision computational human phantom. We also started a development of new polygon-based human phantoms based on Japanese voxel phantoms. The complete version will be published hopefully next year.

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