ESTRO 2024 - Abstract Book

S3744

Physics - Image acquisition and processing

ESTRO 2024

Keywords: CBCT quality phantom

References:

(1) Varian Medical Systems, a Siemens Company, Palo Alto, USA (2) Whole Body Phantom PBU-60 https://www.kyotokagaku.com/en/products/anthropomorphic/ (3) MathWorks, Natick, MA, USA

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Digital Poster

DICOM-CT generation of tumoral beds via 3D scanning with smartphone devices

Nicolás Puente Díaz 1 , Rodrigo Astudillo Olalla 2 , Maria Olga Conde Portilla 1 , Rosa Fabregat Borrás 2 , Marina Gutierrez Ruiz 2 , Guillermo Camacho 2 , Noelia Suarez Alvarez 2 , Fernando Gomez Enriquez 2 , Samuel Ruiz Arrebola 2 , Jose Andres Vazquez Rodriguez 2 , Ana Reguilon Martin 2 , Javier Uzquiza Lopez 2 , Paula Delgado Tapia 2 , Maria Ferri Molina 2 , Santiago Mariano Martin Pastor 2 , Maria Teresa Pacheco Baldor 2 , Jorge Alonso Muriedas 2 1 Universidad de Cantabria, Departamento de Tecnología Electrónica e Ingeniería de Sistemas y Automática, Santander, Spain. 2 Hospital Universitario Marqués de Valdecilla, Radiation Oncology, Santander, Spain

Purpose/Objective:

Current Intra-Operative electron Radiation Therapy (IOeRT) dosimetry calculation techniques are limited to flat surfaces of water, which do not correspond to the actual shape of the tumoral beds.

This proposal aims to generate DICOM-CT files from the tumoral bed in a surgical environment, in a fast enough way to allow an individual dosimetric calculation. For this purpose, fast 3D-surface scanning is performed with a mobile phone, and later, a virtual DICOM-CT is built from the scanned volume.

Material/Methods:

The materials needed for this procedure are a mobile phone that supports Polycam® app (Android or iPhone), and a computer used to process the scanned volume. Photogrammetry is the selected 3D scanning procedure, where an user-defined number of captures are acquired from different perspectives. These captures serve as inputs to a reconstruction algorithm to generate the 3D model. Scans were taken of controlled geometrical objects, of animal tissue samples (ex-vivo), and of IOeRT patients’ tumoral beds (in-vivo).

Tumoral beds are scanned after tumor resection, and before and after IOeRT irradiation. The scanned file of the tumoral bed is then edited with a 3D-editing program in order to remove unnecessary parts from the 3D file.