Search
Results
-
-
How much momentum acceptance is required to track breathing variability in NSCLC patients?
(2022)Purpose Fast energy change within beamline momentum acceptance is investigated as an option to track organ motion in pencil beam scanning proton therapy. Although prior knowledge of the patient’s organ motion can be used to optimize scan paths that minimize acceptance requirements, allowance has to be made to account for breathing variability. We investigate how much variation in beam momentum (dp/p) is required to track lung tumors under ...Conference Poster -
A novel intensity compensation method to achieve energy independent beam intensity at the patient location for cyclotron based proton therapy facilities
(2022)In cyclotron-based proton therapy facilities, an energy selection system is typically used to lower the beam energy from the fixed value provided by the accelerator (250/230 MeV) to the one needed for the treatment (230-70 MeV). Such a system has the drawback of increase beam emittance and introducing an energy-dependent beam current at the patient location, resulting in energy-dependent beam intensity ratios of about 10^3 between high ...Conference Poster -
Fast energy modulation within the beamline momentum acceptance: a clinical feasibility study
(2021)Conference Poster -
A novel method of emittance matching to increase beam transmission for cyclotron-based proton therapy facilities
(2022)In proton therapy, high dose rates can reduce treatment delivery times, allowing for efficient mitigation of tumor motion and increased patient throughput. With cyclotrons however, high dose rates are difficult to achieve for low-energies as, typically, the emittance after the degrader is matched in both transversal planes using circular collimators, which does not provide an optimal matching to the acceptance of the following beamline. ...Conference Poster -
Exploring beamline momentum acceptance of a medical gantry to deliver optimized tumour tracking plans
(2021)Background: Tumour tracking is particularly challenging to realise when it comes to proton therapy. The difficulty of assessing anatomical changes reliably enough to offset the treatment settings on-the-fly, while taking into account the finite range of particles, is beyond the current capabilities of beam delivery and image guidance technologies. Methods: To implement fast range corrections, momentum acceptance (±0.6% dp/p) and global ...Conference Poster -
ITV or tumour tracking for dose painting of NSCLC? A comparison of target coverage and out-of-target dose in proton treatments
(2021)Introduction: Dose-escalation radiotherapy is used to calculate biologically adapted plan. When treating moving tumours the boost on the dose can be lost. We investigated the possibility to use tumour tracking for high precision dose painting in lung cancers. We chose a case where the target motion was below 5mm, normally recruited under free-breathing/rescanning-only protocol. We performed a comparative 4D dose calculation (4DDC) analysis ...Conference Poster