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ST: Fachverband Strahlen- und Medizinphysik

ST 2: Medical Imaging Concepts

ST 2.4: Vortrag

Dienstag, 21. März 2023, 17:45–18:00, ZEU/0146

Proton Radiography: An Overview and Outlook — Jana Hohmann, Kevin Kröninger, Isabelle Schilling, •Hendrik Speiser, and Jens Weingarten — TU Dortmund, department of physics

For years, proton therapy has been increasingly used to treat cancer because of its well-known advantages, such as the high dose precision of protons. However, exploiting this precision requires improved imaging techniques to ensure accurate patient positioning and dose delivery. This allows to reduce the safety margin around the target volume and protecting the surrounding healthy tissue.
  One such enhanced imaging technique is proton radiography. It allows to take images whose properties are directly dependent on the proton interactions with the structures in the patient. Therefore, by measuring the residual energy of protons after passing through the patient, conclusions on the stopping power distribution in the patient can be drawn. Extending a proton radiogram to a CT allows to reduce the proton range uncertainty from the conversion of Hounsfield units into stopping power. However, even a single proton radiogram taken on the treatment day can be used to verify the predefined therapy plan and the correct patient positioning.
  This talk will include an introduction into the topic of proton radiography followed by an overview of several proton radiography approaches. Subsequently, two new methods developed and investigated at the TU Dortmund University are presented and discussed.