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Ion Therapy in the HIT hospital
S12
SFPM Annual Meeting 2012
EFOMP MEDAL
Abstract not available.
INVITED CONFERENCE
TOPIC: DETECTORS
39 New technology for image-guided radiation therapy and for IMRT delivery, including compensating for organ motion
PROFERRED PAPERS
S. Webb The Institute of Cancer Research: Royal Cancer Hospital, London, UK Abstract not available.
TOPIC: ION/PROTON INVITED CONFERENCES 40 Protons and ions within the 10 next years J.-L. Habrand CLCC Caen, France Abstract not available.
41 Spot scanning proton therapy in the PSI hospital F. Albertini Villingen-PSI, Switzerland Abstract not available.
42 Ion Therapy in the HIT hospital O. Ja ¨ckel HIT Heidelberg, Germany Abstract not available.
43 In-vivo dosimetry and on-line imaging in hadrontherapy K. Parodi HIT Heidelberg, Germany Abstract not available.
44 New research in proton/ion therapy V. Malka LOA Paris, France Abstract not available.
TOPIC: QA FOR VMAT REFRESHER COURSE 45 Quality control for VMAT C. Lafond1 and S. Crespin2 CLCC Rennes, 2CH La Roche sur Yon, France
1
46 Validation and implementation of in vivo portal dosimetry for pelvic region treated by intensity modulated radiotherapy J. Camilleri1,2, J. Mazurier1, D. Franck1, M. Ducassou1, O. Gallocher1, I. Latorzeff1, D. Marre1, N. Mathy1, P. Navarro1, D. Zarate1 and X. Franceries2 1 Groupe ONCORAD Garonne - Clinique Pasteur, Service de radiothe´rapie, Toulouse, France, 2INSERM UMR 825 - Hoˆpital PURPAN, Pav.BAUDOT, Toulouse, France Introduction: The aim of this work is to measure the dose delivered to the patient during his treatment using the Electronic Portal Imaging Device (EPID). A formalism already studied in other centers (a) was tested and implemented in clinical routine. Materials and Methods: EPIDs used in this work are aS500 fixed on CLINACs 2300 iX (Varian Medical System) delivering two photon energies (6 and 25 MV). Prior measurements are necessary to define several factors to transform the EPID signal to the patient dose (Corrections factors, Tissue Maximum Ratio, Transit Tissue Maximum Ratio (a)). The EPID signal corresponds to the average greyscale of a region of interest located on the beam axis and associated to the averaged frames. Tests on phantom allowed validating the method for several types of fields. Then, in vivo measurement were realised for prostate cases treated by 3D conformal radiotherapy. Finally, the method was applied for pelvic IMRT treatment (after daily CBCT registration). Results: 120 beams were measured on cubic and anthropomorphic phantom. The average deviation between measured dose (Depid) and planned dose (Dtps) is equal to 1 % 1,8 % (1SD). Concerning in vivo measurements, 56 conformational beams were measured. The average deviation between Depid and Dtps is equal to 1,1 % 2,9 % (1SD). For modulated beams (380 measurements) the average deviation is equal to -0.7 % 2,6 %. Conclusion: Transit dosimetry with EPID allows checking the delivered dose to the patient during his IMRT treatment. It could be possible to reduce significantly the pre-treatment quality assurance for those fields.On the other hand, this method can not be applied for ORL localisations treated by IMRT due to the high dose gradient located on the beam axis. That’s why a 2D model (b) should be considered in the future. References (a) P. Franc ¸ois, P. Boissard, L. Berger et A. Mazal. In vivo verification from back projection of a transit dose measurement on the central axis of photon beams. European Journal of Medical Physics, Vol.27 (1), 1-10, 2011. (b) M.Wendling, RJW. Louwe, LN. McDermott, JJ. Sonke, M.VanHerk et BJ. Mijnheer. Accurate two-dimensional IMRT verification using a back projection EPID dosimetry method. Medical Physics Vol.33, 259-273, 2006. Keywords: Intensity Modulated Radiotherapy, In vivo dosimetry, EPID
47 Comparison of in vivo dosimetry with diode and transit EPID dosimetry L. Ricour and P. Dupuis Unite´ de Physique Me´dicale, CLCC Le´on Be´rard, Lyon, France Introduction: In radiation oncology practises, semi-conductor diodes are used to perform in vivo dosimetry. One major limit of this
SFPM Annual Meeting 2012
EFOMP MEDAL
Abstract not available.
INVITED CONFERENCE
TOPIC: DETECTORS
39 New technology for image-guided radiation therapy and for IMRT delivery, including compensating for organ motion
PROFERRED PAPERS
S. Webb The Institute of Cancer Research: Royal Cancer Hospital, London, UK Abstract not available.
TOPIC: ION/PROTON INVITED CONFERENCES 40 Protons and ions within the 10 next years J.-L. Habrand CLCC Caen, France Abstract not available.
41 Spot scanning proton therapy in the PSI hospital F. Albertini Villingen-PSI, Switzerland Abstract not available.
42 Ion Therapy in the HIT hospital O. Ja ¨ckel HIT Heidelberg, Germany Abstract not available.
43 In-vivo dosimetry and on-line imaging in hadrontherapy K. Parodi HIT Heidelberg, Germany Abstract not available.
44 New research in proton/ion therapy V. Malka LOA Paris, France Abstract not available.
TOPIC: QA FOR VMAT REFRESHER COURSE 45 Quality control for VMAT C. Lafond1 and S. Crespin2 CLCC Rennes, 2CH La Roche sur Yon, France
1
46 Validation and implementation of in vivo portal dosimetry for pelvic region treated by intensity modulated radiotherapy J. Camilleri1,2, J. Mazurier1, D. Franck1, M. Ducassou1, O. Gallocher1, I. Latorzeff1, D. Marre1, N. Mathy1, P. Navarro1, D. Zarate1 and X. Franceries2 1 Groupe ONCORAD Garonne - Clinique Pasteur, Service de radiothe´rapie, Toulouse, France, 2INSERM UMR 825 - Hoˆpital PURPAN, Pav.BAUDOT, Toulouse, France Introduction: The aim of this work is to measure the dose delivered to the patient during his treatment using the Electronic Portal Imaging Device (EPID). A formalism already studied in other centers (a) was tested and implemented in clinical routine. Materials and Methods: EPIDs used in this work are aS500 fixed on CLINACs 2300 iX (Varian Medical System) delivering two photon energies (6 and 25 MV). Prior measurements are necessary to define several factors to transform the EPID signal to the patient dose (Corrections factors, Tissue Maximum Ratio, Transit Tissue Maximum Ratio (a)). The EPID signal corresponds to the average greyscale of a region of interest located on the beam axis and associated to the averaged frames. Tests on phantom allowed validating the method for several types of fields. Then, in vivo measurement were realised for prostate cases treated by 3D conformal radiotherapy. Finally, the method was applied for pelvic IMRT treatment (after daily CBCT registration). Results: 120 beams were measured on cubic and anthropomorphic phantom. The average deviation between measured dose (Depid) and planned dose (Dtps) is equal to 1 % 1,8 % (1SD). Concerning in vivo measurements, 56 conformational beams were measured. The average deviation between Depid and Dtps is equal to 1,1 % 2,9 % (1SD). For modulated beams (380 measurements) the average deviation is equal to -0.7 % 2,6 %. Conclusion: Transit dosimetry with EPID allows checking the delivered dose to the patient during his IMRT treatment. It could be possible to reduce significantly the pre-treatment quality assurance for those fields.On the other hand, this method can not be applied for ORL localisations treated by IMRT due to the high dose gradient located on the beam axis. That’s why a 2D model (b) should be considered in the future. References (a) P. Franc ¸ois, P. Boissard, L. Berger et A. Mazal. In vivo verification from back projection of a transit dose measurement on the central axis of photon beams. European Journal of Medical Physics, Vol.27 (1), 1-10, 2011. (b) M.Wendling, RJW. Louwe, LN. McDermott, JJ. Sonke, M.VanHerk et BJ. Mijnheer. Accurate two-dimensional IMRT verification using a back projection EPID dosimetry method. Medical Physics Vol.33, 259-273, 2006. Keywords: Intensity Modulated Radiotherapy, In vivo dosimetry, EPID
47 Comparison of in vivo dosimetry with diode and transit EPID dosimetry L. Ricour and P. Dupuis Unite´ de Physique Me´dicale, CLCC Le´on Be´rard, Lyon, France Introduction: In radiation oncology practises, semi-conductor diodes are used to perform in vivo dosimetry. One major limit of this