Dosimetry characteristics of the Plus and 12i Gammamed PDR  sources

Pérez‐Calatayud, José; Ballester, F.; Serrano-Andrés, M. A.; Puchades, V.; Lluch, J. L.; Limami, Y.; Casal, F.

doi:10.1118/1.1418725

Cited by 23 publications

(17 citation statements)

References 11 publications

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“…31 Experimental phantoms are usually cubic and commonly used TPSs use as references a water cylinder of diameter and height 40 cm ͑Varian for the GammaMed Plus and 12i sources [20][21][22] ͒ or a water sphere of diameter 30 cm ͑Nucletron for all their sources 17,32-34 ͒. Results…”

Section: Discussionmentioning

confidence: 99%

Influence of phantom material and dimensions on experimental dosimetry

Tedgren

Carlsson

2009

Medical Physics

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In treatment planning of brachytherapy, absorbed dose is calculated by superposing predetermined distributions of absorbed dose to water in water for the single source according to the irradiation pattern ͓i.e., placement of the source͑s͒ or dwelling position͑s͔͒. Single-source reference water data are derived from Monte Carlo ͑MC͒ simulations and/or experiments. For reasons of positional accuracy, experimental brachytherapy dosimetry is most often performed in plastic phantoms. This work investigates the water equivalence of phantoms made from polystyrene, PMMA, and solid water for 192 Ir dosimetry. The EGSnrc MC code is used to simulate radial absorbed dose distributions in cylindrical phantoms of dimensions ranging in size from diameter and height of 20 cm to diameter and height of 40 cm. Water equivalence prevails if the absorbed dose to water in the plastic phantom is the same as the absorbed dose to water in a water phantom at equal distances from the source. It is shown that water equivalence at a specified distance from the source depends not only on the size of the plastic phantom but also on the size of the water phantom used for comparison. Compared to equally sized water phantoms, phantoms of polystyrene are less water equivalent than phantoms of PMMA and solid water but compared to larger water phantoms they are the most water equivalent. Although phantom dimension is the most important single factor influencing the dose distributions around 192 Ir sources, the effect of material properties is nonnegligible and becomes increasingly important as phantom dimensions increase. The importance of knowing the size of the water phantom whose data underlies treatment planning systems, when using such data as a reference in, e.g., detector evaluation studies, is discussed. To achieve the highest possible accuracy in experimental dosimetry, phantom-specific correction factors should be used.

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Section: Discussionmentioning

confidence: 99%

Influence of phantom material and dimensions on experimental dosimetry

Tedgren

Carlsson

2009

Medical Physics

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“…Dimensions for the GammaMed Plus PDR source ͓see Fig. 2͑h͔͒ are taken from the study by Perez-Calatayud et al 40 The Plus source consists of a 0.50 mm long Ir core with a diameter of 0.60 mm enclosed in a 0.90 mm diameter AISI 316L stainless steel capsule ͑density of 7.8 g / cm 3 ͒. Next to the Ir core ͑distal end of the source͒ is a 1.4 mm long solid cylinder of Al with a diameter of 0.60 mm.…”

Section: Iiib7 Gammamed Plus Pdrmentioning

confidence: 99%

EGSnrc Monte Carlo calculated dosimetry parameters for and brachytherapy sources

2008

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This study presents the results of EGSnrc Monte Carlo calculations of the dose distribution surrounding a high dose rate 169Yb brachytherapy source and 14 high dose rate and pulsed dose rate 192Ir brachytherapy sources. Energy-weighted spectra of emitted photons, a full set of TG-43 dosimetry parameters, along-away dose tables, and a description of the materials and geometry used for each source are provided. In addition to this, separate tallies are made of the dose contributed from primary, single-scattered, and multiply-scattered photons. Separation of dose in this manner allows one to use convolution/superposition methods to calculate the dose surrounding a brachytherapy source accounting for a non-homogeneous medium. The effect of phantom size on TG-43 dosimetry parameters and scattered dose is also investigated for the 192Ir microSelectron v2 HDR source. This paper describes the calculation methods and presents the dose rate constants calculated for each source with the full set of dosimetry data being available online at the Carleton Laboratory for Radiotherapy Physics brachytherapy database (http://www.physics.carleton.ca/clrp/seed_database/).

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“…Construction details of the three sources along with their schematic drawings have been presented in the publications introducing their dosimetric properties. [26][27][28][29] The source models for the MC simulations of this work ͑see Sec. II B͒ were configured using information provided by the manufacturers, and the basic source characteristics are summarized in Table I.…”

Section: Iia Radioactive Sourcesmentioning

confidence: 99%

“…Comparisons of MC simulation and deterministic TPS calculated dosimetry results were performed for three different 192 Ir brachytherapy source designs; the VS2000 HDR, GMPlus HDR, and GMPlus PDR, [26][27][28][29] to address the variability of 192 Ir source designs in terms of dimensions and materials of the active core and the encapsulation. Construction details of the three sources along with their schematic drawings have been presented in the publications introducing their dosimetric properties.…”

Section: Iia Radioactive Sourcesmentioning

confidence: 99%

Dosimetric accuracy of a deterministic radiation transport based brachytherapy treatment planning system. Part I: Single sources and bounded homogeneous geometries

et al. 2010

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Results of this work attest the capability of the TPS to accurately account for the scatter conditions regardless of the size or shape of a given geometry of dosimetric interest, and the position of a source within it. This is important since, as shown in the literature and summarized also in this work, these factors could introduce a significant dosimetric effect that is currently ignored in clinical treatment planning. It is concluded that the implementation of the deterministic radiation transport option of the BRACHYVISION v. 8.8 system for 192Ir brachytherapy dosimetry in homogeneous water geometries yields results of comparable accuracy to the golden standard of Monte Carlo simulation, in clinically viable calculation times.

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Dosimetry characteristics of the Plus and 12i Gammamed PDR sources

Cited by 23 publications

References 11 publications

Influence of phantom material and dimensions on experimental dosimetry

Influence of phantom material and dimensions on experimental dosimetry

EGSnrc Monte Carlo calculated dosimetry parameters for and brachytherapy sources

Dosimetric accuracy of a deterministic radiation transport based brachytherapy treatment planning system. Part I: Single sources and bounded homogeneous geometries

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