IPAC2017 - List of Authors (Meer, D.)

Paper	Title	Page
THPVA123	Neutron Doses Due to Beam Losses in a Novel Concept of a Proton Therapy Gantry	4736
	V. Talanov, D.C. Kiselev, D. Meer, V. Rizzoglio, J.M. Schippers, M. Seidel, M. Wohlmuther PSI, Villigen PSI, Switzerland
	A novel design of a gantry for proton therapy is investigated in which a degrader and emittance limiting collimators are mounted on the gantry. Due to the interactions of protons in these components there will be an additional neutron dose at the location where a patient is positioned during a proton therapy. The results of numerical study of this additional dose are presented. Neutron prompt dose at the patient position is estimated through the Monte Carlo simulation using the MCNPX 2.7.0 particle transport code. Secondary neutron and photon fluxes from the distinct beam loss points are taken into consideration and the resulting dose is calculated using realistic estimates of beam losses. The dependence of the dose on the beam energy and individual impacts of each loss point on the total dose at the patient position as well as on critical beam line components are estimated and potential design constraints are discussed. It has been found that compared with a conventional gantry the expected additional dose is higher but the optimization of the beam line configuration and additional shielding shall help to reduce the dose to an acceptable value.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA123
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THPVA124	Simulations and Measurements of Proton Beam Energy Spectrum After Energy Degradation	4740
	A. Gerbershagen, A. Adelmann, R. Dölling, D. Meer, V. Rizzoglio, J.M. Schippers PSI, Villigen PSI, Switzerland
	At the proton therapy facility PROSCAN of the Paul Scherrer Institute the energy modulation of the cyclotron generated proton beam is performed via material insertion into the beam trajectory. The energy spectrum of the particles propagating forwards after such procedure has been simulated and measured. The current paper summarizes the results of these simulations and measurements and illustrates their significance for the future developments of a gantry for proton therapy at the Paul Scherrer Institute.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA124
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THPVA125	Status of Commissioning of Gantry 3 at the PSI PROSCAN Facility	4744
	A. Koschik, J.P. Duppich, M. Eichin, P. Fernandez Carmona, A. Gerbershagen, A.L. Lomax, D. Meer, S. Safai, J.M. Schippers, D.C. Weber PSI, Villigen PSI, Switzerland
	Paul Scherrer Institute currently extends its PROSCAN facility with a third gantry treatment room - Gantry 3, which is realized in a research collaboration with Varian Medical Systems. The main research goals at the PROSCAN facility include further development of precise spot scanning and optimized beam delivery with low dead-time for treatment of moving targets. Consequently Gantry 3 is designed to feature advanced pencil beam scanning technology with a large scan field size of 30x40cm, integrated cone beam CT functionality and will in the future allow fast energy layer switching. The main challenge in realizing Gantry 3 is the integration of the Varian Gantry into the existing PROSCAN control system environment, allowing seamless beam operation. Installation of the additional treatment room has started in summer 2015 followed by the integration and technical commissioning phases of the Gantry in 2016, all during full operation of the existing treatment areas at our facility. We report about the special challenges and achieved performance results during commissioning of the Varian Gantry system in combination with the PSI PROSCAN facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA125
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Neutron Doses Due to Beam Losses in a Novel Concept of a Proton Therapy Gantry

4736

V. Talanov, D.C. Kiselev, D. Meer, V. Rizzoglio, J.M. Schippers, M. Seidel, M. Wohlmuther
PSI, Villigen PSI, Switzerland

A novel design of a gantry for proton therapy is investigated in which a degrader and emittance limiting collimators are mounted on the gantry. Due to the interactions of protons in these components there will be an additional neutron dose at the location where a patient is positioned during a proton therapy. The results of numerical study of this additional dose are presented. Neutron prompt dose at the patient position is estimated through the Monte Carlo simulation using the MCNPX 2.7.0 particle transport code. Secondary neutron and photon fluxes from the distinct beam loss points are taken into consideration and the resulting dose is calculated using realistic estimates of beam losses. The dependence of the dose on the beam energy and individual impacts of each loss point on the total dose at the patient position as well as on critical beam line components are estimated and potential design constraints are discussed. It has been found that compared with a conventional gantry the expected additional dose is higher but the optimization of the beam line configuration and additional shielding shall help to reduce the dose to an acceptable value.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA123

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA124

Simulations and Measurements of Proton Beam Energy Spectrum After Energy Degradation

4740

A. Gerbershagen, A. Adelmann, R. Dölling, D. Meer, V. Rizzoglio, J.M. Schippers
PSI, Villigen PSI, Switzerland

At the proton therapy facility PROSCAN of the Paul Scherrer Institute the energy modulation of the cyclotron generated proton beam is performed via material insertion into the beam trajectory. The energy spectrum of the particles propagating forwards after such procedure has been simulated and measured. The current paper summarizes the results of these simulations and measurements and illustrates their significance for the future developments of a gantry for proton therapy at the Paul Scherrer Institute.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA124

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA125

Status of Commissioning of Gantry 3 at the PSI PROSCAN Facility

4744

A. Koschik, J.P. Duppich, M. Eichin, P. Fernandez Carmona, A. Gerbershagen, A.L. Lomax, D. Meer, S. Safai, J.M. Schippers, D.C. Weber
PSI, Villigen PSI, Switzerland

Paul Scherrer Institute currently extends its PROSCAN facility with a third gantry treatment room - Gantry 3, which is realized in a research collaboration with Varian Medical Systems. The main research goals at the PROSCAN facility include further development of precise spot scanning and optimized beam delivery with low dead-time for treatment of moving targets. Consequently Gantry 3 is designed to feature advanced pencil beam scanning technology with a large scan field size of 30x40cm, integrated cone beam CT functionality and will in the future allow fast energy layer switching. The main challenge in realizing Gantry 3 is the integration of the Varian Gantry into the existing PROSCAN control system environment, allowing seamless beam operation. Installation of the additional treatment room has started in summer 2015 followed by the integration and technical commissioning phases of the Gantry in 2016, all during full operation of the existing treatment areas at our facility. We report about the special challenges and achieved performance results during commissioning of the Varian Gantry system in combination with the PSI PROSCAN facility.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA125

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)