ESTRO meets Asia 2024 - Abstract Book

S228

Interdisciplinary – Other

ESTRO meets Asia 2024

37

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Development and clinical use of a bio-compatible elastic bolus using a 3D printer Jung Kim, Jeaman Son, Hong-Gyun Wu

Radiation Oncology, Seoul National University Hospital, Seoul, Korea, Republic of

Purpose/Objective:

This study focuses on evaluating the efficacy of the Cleanbolus-3D custom TM bolus, a specialized bolus designed to conform to the patient's surface contour, aiming to enhance superficial dose delivery and improve dose uniformity by compensating for tissue irregularities. The investigation encompasses both the physical and biological attributes of the bolus, followed by its application in clinical treatments.

Material/Methods:

The Cleanbolus-3D custom TM bolus underwent rigorous assessments, including evaluations of mass density, shore hardness, elemental composition, skin irritation, and cytotoxicity. Elemental analysis involved combustion for organic elements and X-ray fluorescence for inorganic elements. Following Institutional Review Board (IRB) approval, the bolus was employed in clinical treatments for the ear, scapula, and scalp. Dosimetric characteristics were analyzed by comparing surface doses from the treatment planning system (TPS) with measurements at the surface, using both Cleanbolus-3D custom TM bolus and MOSFET detectors.

Results:

Biological evaluations confirmed the Cleanbolus-3D custom TM bolus as non-cytotoxic, non-irritant, and non sensitizing. The bolus exhibited a mass density of 1.02 g/cc and shore hardness of 00-14. Elemental analysis revealed composition primarily comprising Si, C, O, H, resulting in a calculated effective atomic number (Z eff ) of 10.76. Dosimetric evaluation demonstrated a negligible difference of less than 2% between Cleanbolus-3D custom TM bolus and MOSFET measurements, indicating minimal impact from the air gap effect on dose measurement.

Conclusion:

The Cleanbolus-3D custom TM bolus demonstrated outstanding properties for clinical applications, showing strong agreement between calculated and measured doses. Its reliability in planning and clinical settings suggests its potential to replace and enhance conventional boluses, mitigating their limitations.

Keywords: Skin dose, Bolus, 3D-printing

101

Digital Poster

Effect of Dental Implant in Radiotherapy of Salivary Gland Cancer Using Geant4 Simulation Azizah Noor Baha 1 , Nurul Ab. Aziz Hashikin 2

1 Cancer Centre, Sri Kota Specialist Medical Centre, Klang, Malaysia. 2 School of Physics, Universiti Sains Malaysia, Penang, Malaysia