Polyethylene-based water-equivalent phantom material for X-ray dosimetry at tube voltages from 10 to 100 kV

Hermann, K.-P.; Geworski, Lilli; Muth, M; Harder, Dietrich

doi:10.1088/0031-9155/30/11/002

Cited by 62 publications

(44 citation statements)

References 4 publications

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“…As in previous work, 9 , 10 a phantom of Plastic Water PW2030 (Computerized Imaging Reference Systems, Norfolk, Virginia), was selected for dosimetric water equivalence for low‐energy sources, from 20 to 30 keV 21 23 This phantom material has been evaluated for water equivalence and correction factors derived 9 …”

Section: Methodsmentioning

confidence: 99%

“…Statistical uncertainty in the TLD response(s) is

4 - 5 %

. Uncertainty in the energy correction factor (for TLD response) is

1 - 2 %

, 20 phantom correction is 2%, 7 – 10 , 21 – 23 volume correction is analytically taken to be exact at the TG43 reference point,

(1 cm, π / 2)

, as are inter‐chip corrections, 7 – 10 , 20 and reference calibration of TLD in

{}^{60}{normalC} o

is assigned an uncertainty of 0.5% (TG51 protocol). The combined uncertainty (from all factors) in the dose‐rate constant is therefore 4.8% for the IsoAid source and 7.7% for the Syncor source, where the uncertainty has been combined in quadrature.…”

Section: Methodsmentioning

confidence: 99%

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Dosimetric parameters of three new solid core I‐125 brachytherapy sources

Solberg

DeMarco

Hugo

et al. 2002

J Applied Clin Med Phys

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Monte Carlo calculations and TLD measurements have been performed for the purpose of characterizing dosimetric properties of new commercially available brachytherapy sources. All sources tested consisted of a solid core, upon which a thin layer of normalI125 has been adsorbed, encased within a titanium housing. The PharmaSeed BT‐125 source manufactured by Syncor is available in silver or palladium core configurations while the ADVANTAGE source from IsoAid has silver only. Dosimetric properties, including the dose rate constant, radial dose function, and anisotropy characteristics were determined according to the TG‐43 protocol. Additionally, the geometry function was calculated exactly using Monte Carlo and compared with both the point and line source approximations. The 1999 NIST standard was followed in determining air kerma strength. Dose rate constants were calculated to be 0.955±0.005,0.967±0.005, and 0.962±0.005 cGynormalh−1normalU−1 for the PharmaSeed BT‐125‐1, BT‐125‐2, and ADVANTAGE sources, respectively. TLD measurements were in excellent agreement with Monte Carlo calculations. Radial dose function, g(r), calculated to a distance of 10 cm, and anisotropy function F(r, θ), calculated for radii from 0.5 to 7.0 cm, were similar among all source configurations. Anisotropy constants, trueϕ¯an, were calculated to be 0.941, 0.944, and 0.960 for the three sources, respectively. All dosimetric parameters were found to be in close agreement with previously published data for similar source configurations. The MCNP Monte Carlo code appears to be ideally suited to low energy dosimetry applications.PACS number(s): 87.53.–j

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Section: Methodsmentioning

confidence: 99%

“…Statistical uncertainty in the TLD response(s) is

4 - 5 %

. Uncertainty in the energy correction factor (for TLD response) is

1 - 2 %

, 20 phantom correction is 2%, 7 – 10 , 21 – 23 volume correction is analytically taken to be exact at the TG43 reference point,

(1 cm, π / 2)

, as are inter‐chip corrections, 7 – 10 , 20 and reference calibration of TLD in

{}^{60}{normalC} o

Section: Methodsmentioning

confidence: 99%

Dosimetric parameters of three new solid core I‐125 brachytherapy sources

Solberg

DeMarco

Hugo

et al. 2002

J Applied Clin Med Phys

View full text Add to dashboard Cite

show abstract

“…Muskalla et al [9] evaluated the surface and depth distribution of activity in a different eye phantom, using a polyethylene-based wa ter-equivalent phantom material [10] and commercially available cubic-shaped thermo luminescence detectors. Similar to our find ings published earlier [6], depth distribution measurements corresponded well with those of the manufacturer.…”

Section: Discussionmentioning

confidence: 99%

Results and Implications of High-Resolution Surface Dosimetry of Ruthenium-106 Eye Applicators

Menapace

Binder

Chiari³

1992

Ophthalmologica

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The dosimetry of ¹⁰⁶Ru/¹⁰⁶Rh Β-emitting eye applicators is still inadequate. Manufacturer’s specifications of absolute dose rates are loaded with a ± 30% error, and the relative distribution of activity on the surface is measured on a few points only, using a 3-mm plastic scintillation probe. While reducing the absolute error of dose rate measurements to ± 15% by a method published earlier, we now present a phantom using small thermoluminescent dosimetry crystals for refined assessment of its distribution over the surface. Evaluation of two applicators revealed a 50% increase in activity in the midperiphery in one and a steep falloff of activity 1 mm within the margin of both specimens. The method and findings are demonstrated in detail and compared to those reported by other authors.

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“…A decade later it was reported that the attenuation coefficients of wax at low photon energies differed widely from those of muscle and soft tissues [4]. Phantoms produced from the improved wax-based tissue substitutes with high atomic number fillers, in particular, Mix D [5] and M3 [6], were employed widely in radiation dosimetry [1]. Dosimetric wood-based phantoms were used for many years [7][8][9][10], but cautionary reports have been made about the variable photon attenuation properties of wood [11,12].…”

Section: Introductionmentioning

confidence: 99%

Anthropomorphic Phantoms - Potential for More Studies and Training in Radiology

Ramos¹,

Thomas²,

Berdeguez³

et al. 2017

IJRRT

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Anthropomorphic phantoms are used for the assessment of image quality and to simulate a medical procedure. They can be likewise developed for training and teaching for all modalities of imaging. Phantoms built from tissue-equivalent materials provide a physical representation of the anatomy of the human body and attenuation characteristics, allowing researchers to calculate absorbed organ doses, improving treatments effectiveness and protecting healthy tissues. Nowadays, physical phantoms have been used as a comparison to computational models for validation of Monte Carlo codes, which are computational phantoms. The more complex the tissue is structured, the more difficult it gets to design the phantom. With the development of 3D printers, new phantoms can be built from medical imaging. However, current 3D printers do not use a wide variety of materials, so it is not possible yet to create phantoms for functional imaging. Studies must be performed to optimize current imaging techniques and elevate their accuracy, which would provide visual, practical, hands-on training of the medical staff, with real-world simulations, ideally patient-specific. This technological advance should be made with physical and computational phantoms in parallel since validation has a high value to the reliability of this scientific method. When it comes to radiation protection of patients and staff, new anthropomorphic phantoms could also provide data for new dosimetry and radiation protection studies, serving as a foundation for the progress of radiological safety throughout the world.

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Polyethylene-based water-equivalent phantom material for X-ray dosimetry at tube voltages from 10 to 100 kV

Cited by 62 publications

References 4 publications

Dosimetric parameters of three new solid core I‐125 brachytherapy sources

Dosimetric parameters of three new solid core I‐125 brachytherapy sources

Results and Implications of High-Resolution Surface Dosimetry of Ruthenium-106 Eye Applicators

Anthropomorphic Phantoms - Potential for More Studies and Training in Radiology

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