Development of the Reference Korean Female Voxel Phantom

Ham, Bo-Kyoung; Cho, Kun-Woo; Yeom, Yoen-Soo; Jeong, Jae‐Weon; Kim, Chan-Hyeong; Han, Man Jung

doi:10.14407/jrp.2012.37.1.041

Cited by 2 publications

(1 citation statement)

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“…Despite the aforementioned advantages, the individual dose estimates using the reference DCs can bias the estimated organ doses of the individuals because their anatomy (e.g., organ shape and position and body height and weight) is not the same as that of the reference phantoms used for the reference DCs [10]. Considering that the actual anatomy of the individuals is mostly unknown, it may be impossible to evaluate the exact bias due to the individual anatomy difference from the reference phantoms.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Individual Variation of Organ Doses for Photon External Exposures: A Monte Carlo Simulation Study

Lee,

Choi,

Braunstein

et al. 2024

J Radiat Prot Res

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Background: The reference dose coefficients (DCs) of the International Commission on Radiological Protection (ICRP) have been widely used to estimate organ doses of individuals for risk assessments. This approach has been well accepted because individual anatomy data are usually unavailable, although dosimetric uncertainty exists due to the anatomical difference between the reference phantoms and the individuals. We attempted to quantify the individual variation of organ doses for photon external exposures by calculating and comparing organ DCs for 30 individuals against the ICRP reference DCs.Materials and Methods: We acquired computed tomography images from 30 patients in which eight organs (brain, breasts, liver, lungs, skeleton, skin, stomach, and urinary bladder) were segmented using the ImageJ software to create voxel phantoms. The phantoms were implemented into the Monte Carlo N-Particle 6 (MCNP6) code and then irradiated by broad parallel photon beams (10 keV to 10 MeV) at four directions (antero-posterior, postero-anterior, left-lateral, right-lateral) to calculate organ DCsResults and Discussion: There was significant variation in organ doses due to the difference in anatomy among the individuals, especially in the kilovoltage region (e.g., <100 keV). For example, the red bone marrow doses at 0.01 MeV varied from 3 to 7 orders of the magnitude depending on the irradiation geometry. In contrast, in the megavoltage region (1–10 MeV), the individual variation of the organ doses was found to be negligibly small (differences <10%). It was also interesting to observe that the organ doses of the ICRP reference phantoms showed good agreement with the mean values of the organ doses among the patients in many casesConclusion: The results of this study would be informative to improve insights in individualspecific dosimetry. It should be extended to further studies in terms of many different aspects (e.g., other particles such as neutrons, other exposures such as internal exposures, and a larger number of individuals/patients) in the future.

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Section: Introductionmentioning

confidence: 99%