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Pujades-Claumarchirant M, Garcia-Martinez T, Gimeno-Olmos J, Carmona-Meseguer V, Lliso-Valverde F, Ballester-Pallares F, Perez-Calatayud J. EP-1173: Commissiong and initial experience with dosimetry check, an in vivo volumetric commercial software. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)33479-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Candela-Juan C, Perez-Calatayud J, Ballester F, Rivard MJ. Calculated organ doses using Monte Carlo simulations in a reference male phantom undergoing HDR brachytherapy applied to localized prostate carcinoma. Med Phys 2013; 40:033901. [DOI: 10.1118/1.4791647] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Meigooni AS, Wright C, Koona RA, Awan SB, Granero D, Perez-Calatayud J, Ballester F. Erratum: “TG-43 U1 based dosimetric characterization of model 67-6520 Cs-137 brachytherapy source”. Med Phys 2012; 39:7175. [DOI: 10.1118/1.4758066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Accepted: 09/25/2012] [Indexed: 11/07/2022] Open
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Granero D, Vijande J, Perez-Calatayud J, Richart J, Ballester F. SU-E-T-316: New Design of the Valencia Applicators to Reduce Radiation Leakage. Med Phys 2012; 39:3776. [DOI: 10.1118/1.4735403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Vijande J, Granero D, Perez-Calatayud J, Ballester F. SU-E-T-467: Monte Carlo Dosimetric Study of the New Flexisource Co-60 High Dose Rate Source. Med Phys 2012; 39:3812. [PMID: 28517443 DOI: 10.1118/1.4735556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Recently, a new HDR 60Co brachytherapy source, Flexisource Co-60, has been developed (Nucletron B.V.). This study aims to obtain quality dosimetric data for this source for its use in clinical practice as required by AAPM and ESTRO. METHODS Penelope2008 and GEANT4 Monte Carlo codes were used to dosimetrically characterize this source. Water composition and mass density was that recommended by AAPM. Due to the high energy of the 60Co, dose for small distances cannot be approximated by collisional kerma. Therefore, we have considered absorbed dose to water for r<0.75 cm and collisional kerma from 0.75<r<20 cm. To provide adequate spatial resolution, cells were 0.01 cm in thickness for r<2 cm from the source and a factor of 10 thicker for 2<r<20 cm respectively. Angular sampling was taken every 2°. Additional simulations were performed to obtain SK as recommended by AAPM. Mass-energy absorption coefficients in water and air were consistently derived and used to calculate collisional kerma. Along-away tables and TG-43 formalism parameters and functions were derived. Dosimetric data were also provided following the primary and scatter dose separation for the collapsed cone technique. RESULTS TG-43 dosimetry parameters with L = 0.35 cm were obtained. Results performed with both radiation transport codes showed agreement typically within 0.2% for r > 0.8 cm and up to 2% closer to the source. Using Penelope2008 and GEANT4, an average of Î> = 1.085±0.003 cGy/(h U) (with k = 1, Type A uncertainties) was obtained. Dose rate constant, radial dose function and anisotropy functions for the Flexisource Co-60 are compared with published data for other Co-60 sources. CONCLUSIONS Dosimetric data are provided for the new Flexisource Co-60 source not studied previously in the literature. Using the data provided by this study in the treatment planning systems, it can be used in clinical practice. This project has been funded by Nucletron BV.
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Perez-Calatayud J, Ballester F, Das RK, Dewerd LA, Ibbott GS, Meigooni AS, Ouhib Z, Rivard MJ, Sloboda RS, Williamson JF. Dose calculation for photon-emitting brachytherapy sources with average energy higher than 50 keV: Report of the AAPM and ESTRO. Med Phys 2012; 39:2904-29. [PMID: 22559663 DOI: 10.1118/1.3703892] [Citation(s) in RCA: 196] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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Granero D, Perez-Calatayud J, Ballester F, Ouhib Z, Vijande J, Richart J. PO-328 NEW DESIGN OF THE VALENCIA APPLICATORS TO REDUCE RADIATION LEAKAGE. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72294-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Depiaggio M, Santos M, Rodriguez S, Richart J, Perez-Calatayud J, Ballester F. PO-204 LDRBT IN LOW RISK PROSTATE ADENOCARCINOMA. 145 GY. VS 160 GY. LONG TERM RESULTS AND TOXICITY. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72170-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Perez-Calatayud J. 104 PHYSICS REQUIREMENTS FOR SKIN BRACHYTHERAPY. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72071-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Granero D, Perez-Calatayud J, Ballester F, Crispin V, van del Laarse R, Casal E, Gimeno J. Reply to “Comment on ‘Correspondence factor for Nucletron surface applicators'” [Med. Phys. 39, 2947-2948 (2012)]. Med Phys 2012; 39:2310-1. [DOI: 10.1118/1.3694512] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Camacho C, Pujades MC, Perez-Calatayud J, Lliso F, Carmona V, Tormo A, Ballester F. Impact of the Tiloop Bra® mesh in CT images and dose delivery in breast radiotherapy. J Appl Clin Med Phys 2012; 13:3667. [PMID: 22402383 PMCID: PMC5716420 DOI: 10.1120/jacmp.v13i2.3667] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 10/06/2011] [Accepted: 10/20/2011] [Indexed: 12/03/2022] Open
Abstract
A new titanized breast mesh, TiLOOP Bra, is currently available for implantation in patients who require radiotherapy. The purpose of this work is to study the dosimetric effect of the presence of a TiLOOP Bra mesh on breast radiation treatment and radiographic imaging. The dosimetric effects have been measured for three X‐ray energies: 1.25 MeV, 6 MV and 18 MV, using radiochromic films placed at three different depths. These depths are representative of mesh location in breast during the radiotherapy treatment and hence, are of interest in this study. In order to assess the disturbance in a radiographic image, different computed tomographic (CT) studies of the mesh have been performed. The absorbed dose differences with and without the mesh are less than 1%. No metallic artifacts have been observed in radiographic images associated with the mesh, nor significant disturbances in Hounsfield Units. The TiLOOP Bra mesh does not disturb the dosimetry of a typical radiotherapy treatment and its influence in the quality of the CT scan required for planning is negligible. PACS number: 87.55.‐x
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Vijande J, Ballester F, Ouhib Z, Granero D, Pujades-Claumarchirant MC, Perez-Calatayud J. Dosimetry comparison between TG-43 and Monte Carlo calculations using the Freiburg flap for skin high-dose-rate brachytherapy. Brachytherapy 2012; 11:528-35. [PMID: 22226080 DOI: 10.1016/j.brachy.2011.11.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 09/27/2011] [Accepted: 11/14/2011] [Indexed: 11/16/2022]
Abstract
PURPOSE The purpose of this work was to evaluate whether the delivered dose to the skin surface and at the prescription depth when using a Freiburg flap applicator is in agreement with the one predicted by the treatment planning system (TPS) using the TG-43 dose-calculation formalism. METHODS AND MATERIALS Monte Carlo (MC) simulations and radiochromic film measurements have been performed to obtain dose distributions with the source located at the center of one of the spheres and between two spheres. Primary and scatter dose contributions were evaluated to understand the role played by the scatter component. A standard treatment plan was generated using MC- and TG-43-based TPS applying the superposition principle. RESULTS The MC model has been validated by performing additional simulations in the same conditions but transforming air and Freiburg flap materials into water to match TG-43 parameters. Both dose distributions differ less than 1%. Scatter defect compared with TG-43 data is up to 15% when the source is located at the center of the sphere and up to 25% when the source is between two spheres. Maximum deviations between TPS- and MC-based distributions are of 5%. CONCLUSIONS The deviations in the TG-43-based dose distributions for a standard treatment plan with respect to the MC dose distribution calculated taking into account the composition and shape of the applicator and the surrounding air are lower than 5%. Therefore, this study supports the validity of the TPS used in clinical practice.
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Granero D, Perez-Calatayud J, Ballester F, Ouhib Z. Radiation leakage study for the Valencia applicators. Phys Med 2011; 29:60-4. [PMID: 22169350 DOI: 10.1016/j.ejmp.2011.11.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2011] [Revised: 11/14/2011] [Accepted: 11/18/2011] [Indexed: 11/17/2022] Open
Abstract
INTRODUCTION AND PURPOSE The Valencia applicators which are accessories of the microSelectron-HDR afterloader (Nucletron, Veenendaal, The Netherlands) are designed to treat skin lesions. These cup-shaped applicators are an alternative to superficial/orthovoltage x-ray treatment units. They limit the irradiation to the required area using tungsten-alloy shielding, and are equipped with a tungsten-alloy flattering filter allowing the treatment of skin tumors, the oral cavity, vaginal cuff, etc. The tungsten-alloy thickness to shield radiation is not the same in all parts of the applicators. This fact led us to question whether the leakage radiation differs depending on where it is measured, and whether this may be relevant in some clinical cases. The purpose of this work is to study from the radiation protection point of view the radiation leakage of the Valencia applicators, and provide a solution for current users and for the manufacturer. METHODS AND MATERIALS Simulations based on the Monte Carlo (MC) method using the Geant4 code have been realized studying the dose rate distribution in air around the cup of the Valencia applicators. An experimental study with radiochromic film has also been done to measure the dose distribution in the back side of the applicators and to compare it with MC results. RESULTS AND CONCLUSIONS Radiation leakage of up to 170% of the prescribed dose has been found at the back surface of these applicators. Although this side is not usually directed to the patient, in some applications such as the treatment of a lesion on the nose, special care must be taken to avoid unexpected and unnecessary irradiation of the eyes. A possible solution could be to add additional shielding to the applicator in order to reduce this leakage or to put some shielding to protect the eyes. Additionally, a new concept design of the Valencia applicators using more shielding material in the applicator backside is proposed.
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Richart J, Pujades MC, Perez-Calatayud J, Granero D, Ballester F, Rodriguez S, Santos M. QA of dynamic MLC based on EPID portal dosimetry. Phys Med 2011; 28:262-8. [PMID: 21784685 DOI: 10.1016/j.ejmp.2011.06.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2010] [Revised: 06/24/2011] [Accepted: 06/28/2011] [Indexed: 10/18/2022] Open
Abstract
PURPOSE Dynamic delivery of intensity modulated beams (dIMRT) requires not only accurate verification of leaf positioning but also a control on the speed of motion. The latter is a parameter that has a major impact on the dose delivered to the patient. Time consumed in quality assurance (QA) procedures is an issue of relevance in any radiotherapy department. Electronic portal imaging dosimetry (EPID) can be very efficient for routine tests. The purpose of this work is to investigate the ability of our EPID for detecting small errors in leaf positioning, and to present our daily QA procedures for dIMRT based on EPID. METHODS AND MATERIALS A Varian 2100 CD Clinac equipped with an 80 leaf Millennium MLC and with amorphous silicon based EPID (aS500, Varian) is used. The daily QA program consists in performing: Stability check of the EPID signal, Garden fence test, Sweeping slit test, and Leaf speed test. RESULTS AND DISCUSSION The EPID system exhibits good long term reproducibility. The mean portal dose at the centre of a 10 × 10 cm(2) static field was 1.002 ± 0.004 (range 1.013-0.995) for the period evaluated of 47 weeks. Garden fence test shows that leaf position errors of up to 0.2 mm can be detected. With the Sweeping slit test we are able to detect small deviations on the gap width and errors of individual leaves of 0.5 and 0.2 mm. With the Leaf speed test problems due to motor fatigue or friction between leaves can be detected. CONCLUSIONS This set of tests takes no longer than 5 min in the linac treatment room. With EPID dosimetry, a consistent daily QA program can be applied, giving complete information about positioning/speed MLC.
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Granero D, Otal A, Fernandez JM, Vijande J, Perez-Calatayud J, Ballester F. SU-E-T-382: Revision of the Dosimetric Parameters of the CSM11 LDR Cs-137 Source. Med Phys 2011. [DOI: 10.1118/1.3612336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Perez-Calatayud J, Meseguer VC, Lliso-Valverde F, Pujades M, Camacho C, Ballester F, Tormo A, Rodriguez S, Roldan S, Santos M, Antonini P, Richart J, Granero D. SU-E-T-586: Utrecht Applicator Reconstruction in MRI-Based Cervix Gynaecological Brachytherapy. Med Phys 2011. [DOI: 10.1118/1.3612548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Vijande J, del Carmen Pujades-Claumarchirant M, Granero D, Ouhib Z, Ballester F, Perez-Calatayud J. Dosimetry Comparison Between TG-43 and Monte Carlo Calculations Using the Freiburg Flap for Skin HDR Brachytherapy. Brachytherapy 2011. [DOI: 10.1016/j.brachy.2011.02.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Granero D, Rivard MJ, Ballester F, Perez-Calatayud J, Vijande J, Otal A. SU-GG-T-70: A Dosimetric Study of the MicroSelectron HDR Ir-192 Brachytherapy Source. Med Phys 2010. [DOI: 10.1118/1.3468456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Richart J, Perez-Calatayud J, Granero D, Ballester F. SU-GG-T-227: Dynamic IMRT Split Beam Technique Verification Using EPID Based Dosimetry. Med Phys 2010. [DOI: 10.1118/1.3468618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Miranda S, Antonini P, Roldan S, Tormo A, Rodriguez S, Santos M, Richart J, Lliso F, Perez-Calatayud J, Carmona V, Ballester F. Dose Escalation in Permanent Brachytherapy for Prostate Cancer: Preliminary Results. Brachytherapy 2010. [DOI: 10.1016/j.brachy.2010.02.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Rivard MJ, Granero D, Perez-Calatayud J, Ballester F. Influence of Photon Energy Spectra from 192Ir and 125I Brachytherapy Sources on Kerma and Dose Rates in Water and Air. Brachytherapy 2010. [DOI: 10.1016/j.brachy.2010.02.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ballester F, Granero D, Perez-Calatayud J, Venselaar JLM, Rivard MJ. Study of encapsulated T170m sources for their potential use in brachytherapy. Med Phys 2010; 37:1629-37. [DOI: 10.1118/1.3360441] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Rivard MJ, Granero D, Perez-Calatayud J, Ballester F. Influence of photon energy spectra from brachytherapy sources on Monte Carlo simulations of kerma and dose rates in water and air. Med Phys 2010; 37:869-76. [DOI: 10.1118/1.3298008] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Meigooni AS, Wright C, Koona RA, Awan SB, Granero D, Perez-Calatayud J, Ballester F. TG-43 U1 based dosimetric characterization of model 67-6520 Cs-137 brachytherapy source. Med Phys 2010; 36:4711-9. [PMID: 19928102 DOI: 10.1118/1.3224462] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Brachytherapy treatment has been a cornerstone for management of various cancer sites, particularly for the treatment of gynecological malignancies. In low dose rate brachytherapy treatments, 137Cs sources have been used for several decades. A new 137Cs source design has been introduced (model 67-6520, source B3-561) by Isotope Products Laboratories (IPL) for clinical application. The goal of the present work is to implement the TG-43 U1 protocol in the characterization of the aforementioned 137Cs source. METHODS The dosimetric characteristics of the IPL 137Cs source are measured using LiF thermoluminescent dosimeters in a Solid Water phantom material and calculated using Monte Carlo simulations with the GEANT4 code in Solid Water and liquid water. The dose rate constant, radial dose function, and two-dimensional anisotropy function of this source model were obtained following the TG-43 U1 recommendations. In addition, the primary and scatter dose separation (PSS) formalism that could be used in convolution/superposition methods to calculate dose distributions around brachytherapy sources in heterogeneous media was studied. RESULTS The measured and calculated dose rate constants of the IPL 137Cs source in Solid Water were found to be 0.930 (+/-7.3%) and 0.928 (+/-2.6%) cGy h(-1) U(-1), respectively. The agreement between these two methods was within our experimental uncertainties. The Monte Carlo calculated value in liquid water of the dose rate constant was null set=0.948 (+/-2.6%) cGy h(-1) U(-1). Similarly, the agreement between measured and calculated radial dose functions and the anisotropy functions was found to be within +/-5%. In addition, the tabulated data that are required to characterize the source using the PSS formalism were derived. CONCLUSIONS In this article the complete dosimetry of the newly designed 137Cs IPL source following the AAPM TG-43 U1 dosimetric protocol and the PSS formalism is provided.
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Sancho JR, Perez-Calatayud J, Villalba SR, Santos M, Ballester F, Granero D, Lliso F, Carmona V. TAKING INTO ACCOUNT THE UNCERTAINTY OF THE IONISATION CHAMBER POSITIONING IN IMRT VERIFICATIONS. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)73171-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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