IOMP SCHOOL WEBINARS 2024

29 January 2025 at 12 pm GMT; Duration 1 hour

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Organizer: Magdalena Stoeva, SG IOMP

Moderator: John Damilakis, President IOMP

Speakers: Dr. Daniela Eulenstein, Dr. Hui Khee Looe

Title: RUBY – the modular QA phantom meets online adaptive radiotherapy

Speaker: Dr. Daniela Eulenstein, Research Scientist, PTW

Daniela Eulenstein has a Master’s degree in physics and a PhD in medical physics. She worked as a medical physicist at the radiotherapy department of the Pius Hospital in Oldenburg, Germany headed by Prof Bjoern Poppe. Since 2018, she works at PTW as a Research Scientist as part of the Product Management Team and is responsible for the RUBY Phantom.

Abstract: Online adaptive CT-based radiotherapy has rapidly expanded in recent years. These systems combine CBCT, automatic contouring, and automatic plan optimisation. This complex treatment technique requires robust quality assurance, especially an end-to-end test that accounts for its unique features. To address this challenge, PTW has developed a phantom for quality assurance of online adaptive CT-based radiotherapy systems. This phantom includes a new insert for the RUBY product family, facilitating the insertion of different organ sets and positioning of anthropomorphic structures within the RUBY phantom. In the webinar, based on the example of the Varien ETHOS system, a possible workflow of an online adaptive end-to-end test will be presented to demonstrate the possibilities of the new RUBY adaptive phantom.

Title: LAP LUNA 3D Surface Guided Radiotherapy System

Speaker: Dr. Hui Khee Looe, Deputy Head of Medical Physics, Pius-Hospital, Oldenburg, Germany

Dr. Looe is the Deputy Head of Medical Physics at Pius-Hospital in Oldenburg, Germany and a scientist in the “Medical Radiation Physics” group at the University of Oldenburg. As part of this working group, he undertakes clinical, teaching and research activities, leading the research group focusing on mathematical and computational methods in dosimetry. He also improves patient positioning using Surface Guided Radiation Therapy (SGRT). As part of these activities, he works with the LUNA 3D SGRT system from LAP.

Abstract: Surface-guided radiation therapy (SGRT) has evolved into standard-of-care in modern radiotherapy practices. Besides offering dose-less, marker-free patient positioning guidance, such a system allows for real-time monitoring and advanced respiratory motion management. Recently, a new SGRT system has been launched. This presentation will describe the testing, implementation, and clinical evaluation of the novel SGRT system LUNA 3D (LAP, Germany). The system was installed at a C-arm linac (Synergy, Elekta). The acceptance tests were implemented according to the ESTRO-ACROP guideline. Both static and dynamic accuracies have been evaluated using the EASY CUBE phantom in combination with a translational and dynamic platform. The End-to-End (E2E) testing using the RUBY phantom (PTW, Germany) was adapted to accommodate the laser-free positioning. Clinical evaluations were performed by comparing the patient positioning using LUNA 3D and lasers and the necessary CBCT-based corrections. All test results lie within the manufacturer’s specifications and ESTRO guideline tolerances. A clinical comparison of LUNA 3D with lasers and CBCT positionings shows the system can provide accurate patient positioning guidance.