Evaluation of dosimetric functions for Ir-192 source using radiochromic film

Sellakumar, P.; Kumar, Arvind; Supe, Sanjay S.; Anand, M.R.; Nithya, K.; Sajitha, S.

doi:10.1016/j.nimb.2009.03.003

Cited by 15 publications

(14 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A number of studies have evaluated different detector types for the dosimetry of low energy photon beams (Fletcher and Mills, 2008;Guillerminet et al, 2005;Healy et al, 2005;Hill et al, 2008;Hugtenburg et al, 2001;Jurado et al, 2005;Li et al, 1997;Ma et al, 1998;Nelson et al, 2008;Prestwich and Murphy, 2000;Rink et al, 2007;Sellakumar et al, 2009). There are limited recommendations by which a new detector should be tested in order that it can replace a gold standard detector.…”

Section: Introductionmentioning

confidence: 99%

The Bland–Altman analysis: Does it have a role in assessing radiation dosimeter performance relative to an established standard?

Hill

Tofts

Baldock

2010

Radiation Measurements

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

The Bland–Altman analysis: Does it have a role in assessing radiation dosimeter performance relative to an established standard?

Hill

Tofts

Baldock

2010

Radiation Measurements

View full text Add to dashboard Cite

“…This would put the point at approximately 5.7 mm from the tip of the source (the source is 3.6 mm long)-which is a point often lying on the tip of a treatment applicator. The dose profile along the axis of the source is related to the anisotropy function and has been previously documented that the anisotropy function is at its weakest in the direction along the plane of the source [14,17,22]. Due to this, and since the difference from published results is only slightly above 2% (i.e.…”

Section: Source Configuration Data Checkmentioning

confidence: 94%

“…Each site had non-optimized and IPSA optimized plans created. The PTV was used as the CTV used in the COIN formula [21,22]. The reference isodose was the 100% isodose line Comparison of DVH graphs showed a close correlation between Plato and Oncentra planning systems, with shape and relative curve values consistent from one system to the next.…”

Section: Geometrical Optimizationmentioning

confidence: 99%

Methodology for commissioning a brachytherapy treatment planning system in the era of 3D planning

Dempsey

2010

Australas Phys Eng Sci Med

View full text Add to dashboard Cite

To describe the steps undertaken to commission a 3D high dose rate (HDR) brachytherapy treatment planning system (TPS). Emphasis was placed on validating previously published recommendations, in addition to checking 3D parameters such as treatment optimization and dose volume histogram (DVH) analysis. Commissioning was performed of the brachytherapy module of the Nucletron Oncentra MasterPlan treatment planning system (version 3.2). Commissioning test results were compared to an independent external beam TPS (Varian Eclipse v 8.6) and the previously commissioned Nucletron Plato (v 14.3.7) brachytherapy treatment planning system, with point doses also independently verified using the brachytherapy module in RadCalc (v 6.0) independent point dose calculation software. Tests were divided into eight categories: (i) Image import accuracy, (ii) Reconstruction accuracy, (iii) Source configuration data check, (iv) Dose calculation accuracy, (v) Treatment optimization validation, (vi) DVH reproducibility, (vii) Treatment export check and (viii) Printout consistency. Point dose agreement between Oncentra, Plato and RadCalc was better than 5% with source data and dose calculation protocols following the American Association of Physicists in Medicine (AAPM) guidelines. Testing of image accuracy (import and reconstruction), along with validation of automated treatment optimization and DVH analysis generated a more comprehensive set of testing procedures than previously listed in published recommendations.

show abstract

“…Lack of unanimous results, which would support definitely the statistical insignificance of the dependence of radiochromic film's reaction to radiation energy (especially lower than 500 kV), convinced us to use iridium source for film calibration. Homogenous irradiation of a piece of film detector with a point source in one position [ 31 ] is not achievable, therefore, a special arrangement of irradiation based on Khushdeep Singh's [ 21 ] work with two catheters was used. That allowed to deposit not less than 95% with standard deviation of 0.82% of reference dose on a defined film area.…”

Section: Discussionmentioning

confidence: 99%

Film based verification of calculation algorithms used for brachytherapy planning-getting ready for upcoming challenges of MBDCA

Zwierzchowski

Bielęda

Skowronek

et al. 2016

jcb

View full text Add to dashboard Cite

PurposeWell-known defect of TG-43 based algorithms used in brachytherapy is a lack of information about interaction cross-sections, which are determined not only by electron density but also by atomic number. TG-186 recommendations with using of MBDCA (model-based dose calculation algorithm), accurate tissues segmentation, and the structure's elemental composition continue to create difficulties in brachytherapy dosimetry. For the clinical use of new algorithms, it is necessary to introduce reliable and repeatable methods of treatment planning systems (TPS) verification. The aim of this study is the verification of calculation algorithm used in TPS for shielded vaginal applicators as well as developing verification procedures for current and further use, based on the film dosimetry method.Material and methodsCalibration data was collected by separately irradiating 14 sheets of Gafchromic® EBT films with the doses from 0.25 Gy to 8.0 Gy using HDR 192Ir source. Standard vaginal cylinders of three diameters were used in the water phantom. Measurements were performed without any shields and with three shields combination. Gamma analyses were performed using the VeriSoft® package.ResultsCalibration curve was determined as third-degree polynomial type. For all used diameters of unshielded cylinder and for all shields combinations, Gamma analysis were performed and showed that over 90% of analyzed points meets Gamma criteria (3%, 3 mm).ConclusionsGamma analysis showed good agreement between dose distributions calculated using TPS and measured by Gafchromic films, thus showing the viability of using film dosimetry in brachytherapy.

show abstract

Evaluation of dosimetric functions for Ir-192 source using radiochromic film

Cited by 15 publications

References 39 publications

The Bland–Altman analysis: Does it have a role in assessing radiation dosimeter performance relative to an established standard?

The Bland–Altman analysis: Does it have a role in assessing radiation dosimeter performance relative to an established standard?

Methodology for commissioning a brachytherapy treatment planning system in the era of 3D planning

Film based verification of calculation algorithms used for brachytherapy planning-getting ready for upcoming challenges of MBDCA

Contact Info

Product

Resources

About