ESTRO 2024 - Abstract Book

S3747

Physics - Image acquisition and processing

ESTRO 2024

3D-scans of tumoral beds from patients treated with IOeRT, and it represents a step towards personalized IOeRT treatment. For this future goal, a deeper characterization must to be performed if these images are used for dosimetric calculation.

Keywords: IOERT, CT, Surface

References:

[1] Burgner J. et al.: A study on the theoretical and practical accuracy of conoscopic holography-based surface measurements: toward image registration in minimally invasive surgery. Int J Med Robot. 9(2), 190-203 (2013).

[2] García-Vázquez V. et al: Surface scanning for 3D dose calculation in intraoperative electron radiation therapy. Radiation Oncology 13, 243 (2018)

[3] Tonus C., Strassmann G., Debertshäuser D. et al.: Intraoperative Strahlentherapie - Fortschritt durch ein CT gestütztes Navigationssystem. Chirurg 72, 731-735 (2001).

[4] Wears B., Mohiuddin I., Flynn R., Waldron T., Kim Y., Allen B. y Xia J.: Development of a Novel Scanning Beam Low Energy Intraoperative Radiation Therapy (SBIORT) System for Pancreatic Cancer. Med. Phys., 43: 3814-3814 (2016).

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Digital Poster

Inter-observer variability of corresponding anatomical landmark placement in pelvic CT scans

Georgios Andreadis 1 , Wendy Visser-Groot 1 , Stephanie M. de Boer 1 , Peter A.N. Bosman 2 , Tanja Alderliesten 1

1 Leiden University Medical Center, Radiation Oncology, Leiden, Netherlands. 2 Centrum Wiskunde & Informatica, Evolutionary Intelligence, Amsterdam, Netherlands

Purpose/Objective:

Anatomical landmarks are often used to assess the quality of a deformable image registration (DIR) between two scans. Such landmarks are manually placed at anatomically relevant sites on both scans to measure the accuracy of the registration at these locations. However, manual placement of landmarks is prone to observer variability, which could impact their validity as a quality measure. We aim to quantify and analyse this inter-observer variability on pelvic CT scans that feature large deformations.

Material/Methods: