Organ and effective dose conversion coefficients for a sitting female hybrid computational phantom exposed to monoenergetic protons in idealized irradiation geometries

Alves, Mary Cristina Ferreira; Santos, William S.; Lee, Choonsik; Bolch, Wesley E.; Hunt, John

doi:10.1088/0031-9155/59/24/7957

Cited by 8 publications

(14 citation statements)

References 10 publications

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“…One billion histories (10 9 ) were simulated from 10 to 30 MeV in AP, PA and lateral geometries and from 10 to 50 MeV in ROT and ISO geometries. More details about the sitting hybrid phantom can be found in our previous paper and in Han et al (12,25) . Details of the UFH/NCI adult male phantom can be found in Lee et al (21) .…”

Section: Methodsmentioning

confidence: 99%

“…There are few studies in the literature that attempt to calculate doses in computational phantom in the sitting posture, but even in these studies only photon, electron or positron doses were calculated (6)(7)(8)(9)(10)(11) . In a previous paper, organ dose conversion coefficients for protons were calculated using the sitting and standing female hybrid phantom and the influence of the posture in absorbed dose was discussed (12) . It turns out that changing the posture of the computational phantom may contribute to differences in absorbed dose in organs and tissues and, depending on the irradiation scenario, phantoms with variable stature in standing or sitting configurations can be used to contribute to reducing the uncertainties (6,12) .…”

Section: Introductionmentioning

confidence: 99%

“…In a previous paper, organ dose conversion coefficients for protons were calculated using the sitting and standing female hybrid phantom and the influence of the posture in absorbed dose was discussed (12) . It turns out that changing the posture of the computational phantom may contribute to differences in absorbed dose in organs and tissues and, depending on the irradiation scenario, phantoms with variable stature in standing or sitting configurations can be used to contribute to reducing the uncertainties (6,12) . To better represent these posture differences, this study presents adult male hybrid anthropomorphic phantoms, in both standing and sitting positions, for calculation of organ and effective dose conversion coefficients.…”

Section: Introductionmentioning

confidence: 99%

“…Hybrid anthropomorphic phantom are representation of the human body developed using tomographic images like voxel phantoms but adjusted using a 3D modeling software to better represent organ, tissues and external contours of a real person. First the phantom is polygonized then internal organs are modeled to match reference organ volume and smooth contours via polygon mesh and NURBS (nonuniform rational B-spline) surface and afterward the phantom is voxelized (12)(13)(14) .…”

Section: Introductionmentioning

confidence: 99%

“…The conversion factors from different postures were compared to each other. Sex-averaged effective dose conversion coefficients (22) were obtained from the results of the absorbed dose conversion coefficients for the male phantom calculated in this study and the results for the female hybrid phantom presented in a previous paper (12) . Results of effective dose conversion coefficients of UFH/NCI standing phantom were also compared with tabulated effective dose conversion coefficients provided in ICRP publication 116 (1) concerning external irradiation beam of protons using the reference phantom of the ICRP publication 110 (23) .…”

Section: Introductionmentioning

confidence: 99%

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Conversion Coefficients for Proton Beams using Standing and Sitting Male Hybrid Computational Phantom Calculated in Idealized Irradiation Geometries

Alves

Santos

Lee

et al. 2016

Radiat Prot Dosimetry

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The aim of this study was the calculation of conversion coefficients for absorbed doses per fluence (DT/Φ) using the sitting and standing male hybrid phantom (UFH/NCI) exposure to monoenergetic protons with energy ranging from 2 MeV to 10 GeV. Sex-averaged effective dose per fluence (E/Φ) using the results of DT/Φ for the male and female hybrid phantom in standing and sitting postures were also calculated. Results of E/Φ of UFH/NCI standing phantom were also compared with tabulated effective dose conversion coefficients provided in ICRP publication 116. To develop an exposure scenario implementing the male UFH/NCI phantom in sitting and standing postures was used the radiation transport code MCNPX. Whole-body irradiations were performed using the recommended irradiation geometries by ICRP publication 116 antero-posterior (AP), postero-anterior (PA), right and left lateral, rotational (ROT) and isotropic (ISO). In most organs, the conversion coefficients DT/Φ were similar for both postures. However, relative differences were significant for organs located in the lower abdominal region, such as prostate, testes and urinary bladder, especially in the AP geometry. Results of effective dose conversion coefficients were 18% higher in the standing posture of the UFH/NCI phantom, especially below 100 MeV in AP and PA. In lateral geometry, the conversion coefficients values below 20 MeV were 16% higher in the sitting posture. In ROT geometry, the differences were below 10%, for almost all energies. In ISO geometry, the differences in E/Φ were negligible. The results of E/Φ of UFH/NCI phantom were in general below the results of the conversion coefficients provided in ICRP publication 116.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Conversion Coefficients for Proton Beams using Standing and Sitting Male Hybrid Computational Phantom Calculated in Idealized Irradiation Geometries

Alves

Santos

Lee

et al. 2016

Radiat Prot Dosimetry

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Comparison of photon organ and effective dose coefficients for PIMAL stylized phantom in bent positions in standard irradiation geometries

Dewji

Reed

Hiller

2017

Radiat Environ Biophys

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Computational phantoms with articulated arms and legs have been constructed to enable the estimation of radiation dose in different postures. Through a graphical user interface, the Phantom wIth Moving Arms and Legs (PIMAL) version 4.1.0 software can be employed to articulate the posture of a phantom and generate a corresponding input deck for the Monte Carlo N-Particle (MCNP) radiation transport code. In this work, photon fluence-to-dose coefficients were computed using PIMAL to compare organ and effective doses for a stylized phantom in the standard upright position with those for phantoms in realistic work postures. The articulated phantoms represent working positions including fully and half bent torsos with extended arms for both the male and female reference adults. Dose coefficients are compared for both the upright and bent positions across monoenergetic photon energies: 0.05, 0.1, 0.5, 1.0, and 5.0 MeV. Additionally, the organ doses are compared across the International Commission on Radiological Protection's standard external radiation exposure geometries: antero-posterior, postero-anterior, left and right lateral, and isotropic (AP, PA, LLAT, RLAT, and ISO). For the AP and PA irradiation geometries, differences in organ doses compared to the upright phantom become more profound with increasing bending angles and have doses largely overestimated for all organs except the brain in AP and bladder in PA. In LLAT and RLAT irradiation geometries, energy deposition for organs is more likely to be underestimated compared to the upright phantom, with no overall change despite increased bending angle. The ISO source geometry did not cause a significant difference in absorbed organ dose between the different phantoms, regardless of position. Organ and effective fluence-to-dose coefficients are tabulated. In the AP geometry, the effective dose at the 45° bent position is overestimated compared to the upright phantom below 1 MeV by as much as 27% and 82% in the 90° position. The effective dose in the 45° bent position was comparable to that in the 90° bent position for the LLAT and RLAT irradiation geometries. However, the upright phantom underestimates the effective dose to PIMAL in the LLAT and RLAT geometries by as much as 30% at 50 keV.

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Fluence-to-dose conversion coefficients based on the posture modification of Adult Male (AM) and Adult Female (AF) reference phantoms of ICRP 110

Galeano

Santos

Alves

et al. 2016

Radiation Physics and Chemistry

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Organ and effective dose conversion coefficients for a sitting female hybrid computational phantom exposed to monoenergetic protons in idealized irradiation geometries

Cited by 8 publications

References 10 publications

Conversion Coefficients for Proton Beams using Standing and Sitting Male Hybrid Computational Phantom Calculated in Idealized Irradiation Geometries

Conversion Coefficients for Proton Beams using Standing and Sitting Male Hybrid Computational Phantom Calculated in Idealized Irradiation Geometries

Comparison of photon organ and effective dose coefficients for PIMAL stylized phantom in bent positions in standard irradiation geometries

Fluence-to-dose conversion coefficients based on the posture modification of Adult Male (AM) and Adult Female (AF) reference phantoms of ICRP 110

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