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DJR 49-2B: A novel lung SBRT treatment planning: inverse VMAT plan with leaf motion limitation to ensure the irradiation reproducibility of a moving target

Course Details

MDCB Credits: 2.50

ARRT Credits: 1.00

Available Until: 4/30/2026

Non-Member Price: $87.50

Member Price: $50.00

Member PLUS Price: $50.00

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Authors: Julien Darréon, PhD,1, Sree Bash Chandra Debnath, PhD, Mohamed Benkreira, Msc ,Pierre Fau, PhD, Hugues Mailleux, Msc , Marjorie Ferré, PhD, Ahcene Benkemouche, Msc , Agnès Tallet, MD, Pierre Annede, MD§, Claire Petit, MD, PhD, Naji Salem, MD

Département de Physique Médicale, Institut Paoli-Calmettes, Marseille, 13009, France
Aix Marseille Université, CNRS, CINaM UMR 7325, Marseille, 13288, France
Institut Paoli-Calmettes, Service de Radiothérapie, Marseille, 13009, France
§ Centre de radiothérapie Saint Louis, Croix Rouge Française, Toulon, 83100, France

This study exposed the implementation of a novel technique (VMATLSL) for the planning of moving targets in lung stereotactic body radiation therapy (SBRT). This new technique has been compared to static conformal radiotherapy (3D-CRT), volumetric-modulated arc therapy (VMAT) and dynamic conformal arc (DCA). The rationale of this study was to lower geometric complexity (54.9% lower than full VMAT) and hence ensure the reproducibility of the treatment delivery by reducing the risk for interplay errors induced by respiratory motion. Dosimetry metrics were studied with a cohort of 30 patients. Our results showed that leaf speed limitation provided conformal number (CN) close to the VMAT (median CN of VMATLSL is 0.78 vs 0.82 for full VMAT) and were a signi?cant improvement on 3D-CRT and DCA with segment-weight optimized (respectively 0.55 and 0.57). This novel technique is an alternative to VMAT or DCA for lung SBRT treatments, combining independence from the patient’s breathing pattern, from the size and amplitude of the lesion, free from interplay effect and with dosimetry metrics close to the best that could be achieve with full VMAT.

As of January 1, 2022, ARRT requires CE Credits for Directed Journal Readings to be based on the word count for each article. So, the number of CE Credits for each DJR article will vary for ARRT. For this article, the ARRT CE Credit will be 0.75 Credit. The MDCB CE Credits will remain at 2.5 Credits.

ARRT CQR Credit Distribution
Radiation Therapy 2017:
Prescription and Dose Calculation = 1.0

Radiation Therapy 2022       

Prescription and Dose Calculation = 1.0