Göttingen 2025 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 8: Particle Radiography
ST 8.1: Vortrag
Donnerstag, 3. April 2025, 16:15–16:30, ZHG003
Online Adaptive Radiotherapy with Silicon Detectors — Kevin Kröninger, Hendrik Speiser, •Annsofie Tappe, Helen Thews, and Jens Weingarten — TU Dortmund
Proton therapy is a relevant modality of radiation therapy used to treat cancer, offering the main advantage of a well-defined proton range. Knowing the exact range is crucial in proton therapy to minimize radiation exposure to healthy tissues and ensure the correct tumor dose.
Anatomical changes in the patient between treatments significantly impact proton range. Therefore, an imaging technique is required to monitor these changes. One potential solution is a proton radiography system that can be used behind the patient in the beam axis.
We currently study the realization of a two-plane imaging system, consisting of two silicon pixel detectors and an intermediate absorber. This setup measures a two dimensional image of the water equivalent thickness (WET) of the patient along the beam axis during the treatment. A trigger for plan adaption could be given when the measured WET deviates from the expected value.
As part of a master thesis, this system is being implemented in the Monte Carlo simulation tool Allpix2, to optimize the prototype and the post processing of the measured data. With simulations, we aim to improve data analysis and make first predictions of the feasibility in online adaptive proton therapy. To evaluate this, we want to determine the WET accuracy and precision with this system.
The talk will provide a short introduction of proton radiography, introduce the two-plane system and showcase simulated WET images.
Keywords: Proton Radiography; Pixel detector; Proton Therapy; Proton Imaging; Allpix