56th SSRMP Annual Meeting

Session

Session III

1 Dec 2023, 09:00

Konferenzsaal Coronado (Conference Center)

35. JulianA: automatic spot weight optimisation for proton radiotherapy

Renato Bellotti (PSI - Paul Scherrer Institut)

01/12/2023, 09:00

Radiation Therapy

Oral

Purpose To introduce JulianA, a novel algorithm for automatic treatment planning for proton therapy (PT). Its name combines our in-house treatment planning system, FIonA, with the Julia programming language.
Methods JulianA utilises a novel plan quality scoring system tailored to represent the clinical intent, encompassing prescribed dose levels and organ-at-risk (OAR) dose...

36. Impact of penumbra sharpness on lateral margin requirement for ocular proton therapy

Daniel Björkman (PSI - Paul Scherrer Institut)

01/12/2023, 09:10

Radiation Therapy

Oral

Purpose
Ocular malignancies are treated worldwide with proton therapy using a diverse set of accelerator delivery systems. Lateral margin usage remains consistent, despite variations in dose characteristics. This study quantifies the interchangeability of lateral margin and penumbra sharpness in ocular proton therapy, addressing a key treatment optimization factor.

Methods
In this study,...

38. Tissue assignment using combined MR CT for activation calculations in pencil beam scanning proton therapy patients

Anne zur Horst (ETH Zurich)

01/12/2023, 09:20

Radiation Therapy

Oral

Purpose: To improve the prediction of positron emission tomography (PET) activity for treatment verification of proton therapy, magnetic resonance (MR) and computed tomography (CT) images were combined to assign an elemental composition to voxels within the CT based on the tissues identified in the MR.
Methods: Clinical treatment plans were generated for six head and neck patients. The...

40. Improving proton therapy delivery efficiency via combination of advanced spot positioning algorithms and ridge filter

Martina Bonomi (PSI)

01/12/2023, 09:30

Radiation Therapy

Oral

Purpose:
Rescanning, gating, and breath-hold are promising approaches for realising proton therapy treatments of moving targets, but decrease delivery efficiency, lengthening treatment delivery time. In PBS (Pencil Beam Scanning) proton therapy, two factors influence the treatment delivery time: the beam-on time and the dead time, which is the time required for energy-layer and spot-position...

17. Synchrony modality on Radixact: evaluation of the targeting accuracy

Marie Fargier-Voiron (Clinique de Genolier and Clinique Générale-Beaulieu, Swiss Radio-Oncology Network)

01/12/2023, 09:40

Radiation Therapy

Oral

Purpose: The Radixact Synchrony modality enables to correct in real-time for tumor motion during tomohelical treatments by adjusting jaws and/or MLC position (Schnarr, 2018). The Synchrony precision was already investigated but only with gamma index methodology, which prevents discrimination between dose and geometric errors. Thus, the aim of this study is to quantify the Synchrony...

20. Robust optimization of lung SBRT treatments using CyberKnife with Synchrony and X-Sight Spine tracking methods

Maude Gondré (IRA)

01/12/2023, 09:50

Radiation Therapy

Oral

Purpose: To assess the dosimetric gain on ipsilateral lung using robust optimization on the GTV (GTV-based) or ITV (ITV-based) instead of standard PTV optimization (PTV-based) for lung stereotactic body radiotherapy (SBRT) on the CyberKnife with Synchrony and X-sight spine tracking methods.

Methods: For on-line synchrony tracking, 15 lung SBRT were calculated with both GTV- and PTV-based...

8. Reference dosimetry for electron FLASH radiotherapy at METAS

Franziska Frei (METAS)

01/12/2023, 10:00

Radiation Therapy

Oral

Purpose
Radiotherapy with ultra-high dose rates (UHDR) or FLASH radiotherapy (RT), offers the potential of significant reduction in side effects for cancer patients, and associated improvement in quality of life. In the short term, new electron and proton beam facilities for FLASH are currently being installed or being upgraded to FLASH mode. The clinical application of such radiation...