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Effects of spot parameters in pencil beam scanning treatment planning
Medical Physics, 2017BackgroundSpot size σ (in air at isocenter), interspot spacing d, and spot charge q influence dose delivery efficiency and plan quality in Intensity Modulated Proton Therapy (IMPT) treatment planning. The choice and range of parameters varies among different manufacturers.
Aafke Christine, Kraan +5 more
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Development of Pencil Beam Scanning Nozzle System
2009Purpose: Several types of pencil beam scanning system for proton therapy have been developed and applied to clinical treatment. In case of pencil beam scanning using cyclotron as the proton source, it is common to use continuous scanning method. Then scanning speed and beam current are modulated simultaneously[for full text, please go to the a.m. URL]
Asaba, T +5 more
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Proton FLASH: passive scattering or pencil beam scanning?
Physics in Medicine & Biology, 2021Abstract This study focused on a direct comparison of dose delivery efficiency between two proton FLASH delivery modes: passive scattering and pencil beam scanning (PBS). Monte-Carlo simulation of the beamline was performed using the Geant4 package. Two proton energies (63 and 230 MeV) were selected, targeting for
Guoliang Zhang +3 more
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Experimentally validated pencil beam scanning source model in TOPAS
Physics in Medicine and Biology, 2014The presence of a low-dose envelope, or 'halo', in the fluence profile of a proton spot can increase the output of a pencil beam scanning field by over 10%. This study evaluated whether the Monte Carlo simulation code, TOPAS 1.0-beta 8, based on Geant4.9.6 with its default physics list, can predict the spot halo at depth in phantom by incorporating a ...
Liyong, Lin +4 more
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Dosimetric consequences of pencil beam width variations in scanned beam particle therapy
Physics in Medicine and Biology, 2013Scanned ion beam delivery enables the highest degree of target dose conformation attainable in external beam radiotherapy. Nominal pencil beam widths (spot sizes) are recorded during treatment planning system commissioning. Due to changes in the beam-line optics, the actual spot sizes may differ from these commissioning values, leading to differences ...
M A, Chanrion +4 more
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Physics in Medicine and Biology, 2015
The purpose of this study was to assess the feasibility of proton pencil beam scanning (PBS) for the treatment of mediastinal lymphoma. A group of 7 patients of varying tumor size (100-800 cc) were planned using a PBS anterior field. We investigated 17 fractions of 1.8 Gy(RBE) to deliver 30.6 Gy(RBE) to the internal target volume (ITV).
C, Zeng +6 more
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The purpose of this study was to assess the feasibility of proton pencil beam scanning (PBS) for the treatment of mediastinal lymphoma. A group of 7 patients of varying tumor size (100-800 cc) were planned using a PBS anterior field. We investigated 17 fractions of 1.8 Gy(RBE) to deliver 30.6 Gy(RBE) to the internal target volume (ITV).
C, Zeng +6 more
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Investigation of scan path optimization in improving proton pencil beam scanning continuous delivery
Physics in Medicine & Biology, 2023Abstract Objective . To investigate the impact of scan path optimization on the dose accuracy and beam delivery time (BDT) of proton pencil beam scanning in the dose-driven continuous scanning (DDCS). Approach .
Chunbo Liu +8 more
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Parametric Synthesis of Well-Scanning Isophoric Pencil Beams
IEEE Transactions on Antennas and Propagation, 2017Interest in uniformly illuminated (isophoric) density-tapered planar antenna arrays has recently revived. For arrays consisting of concentric rings of elements, we present a nonstochastic algorithm that calculates ring radii for generation of pencil beams without the need for prior specification of the number of rings.
Salas-Sanchez, AA +3 more
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Multi-purpose nozzle for pencil beam scanning and wobbling
2009PTCOG 48; Meeting of the Particle Therapy Co-Operative ...
Tachikawa, T +5 more
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Clinical Pencil Beam Scanning: Present and Future Practices
2016Pencil beam scanning (PBS) is the most advanced beam delivery technology in particle therapy nowadays. After a pioneering phase, PBS is rapidly becoming available on a larger scale worlwide, and is expected to be the standard beam delivery technique in the future to come.
Marco Schwarz +7 more
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