ESTRO 2024 - Abstract Book

S172

Brachytherapy - GI, paediatric, miscellaneous

ESTRO 2024

Reirradiation using HDR-IORT is well tolerated with low toxicity. An individualized multimodality approach using HDR-IORT in the oligometastatic setting is a potential treatment option. Dose escalation in addition to HDR-IORT using external beam radiotherapy (EBRT) appears to improve local control.

Keywords: personalisation, high dose brachytherapy

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Digital Poster

The development of a rectal brachytherapy applicator combined with a transrectal ultrasound probe

Alaattin Ozen 1,2,3 , Merdan Fayda 4,5 , Mert Saynak 6 , Gorkem Turkkan 2 , Helin Ismet 7

1 Teknart Health Services R&D Medical Devices Industry and Trade Limited Company, Department of Radiation Oncology, Eskisehir, Turkey. 2 Hisar Hospital Intercontinental, Radiation Oncology Clinic, Istanbul, Turkey. 3 Uskudar University Faculty of Medicine, Department of Radiation Oncology, Istanbul, Turkey. 4 Liv Hospital Ulus, Radiation Oncology Clinic, Istanbul, Turkey. 5 Istinye University Faculty of Medicine, Department of Radiation Oncology, Istanbul, Turkey. 6 Trakya University Faculty of Medicine, Department of Radiation Oncology, Edirne, Turkey. 7 Eskisehir Technical University Faculty of Architecture and Design, Department of Industrial Design, Eskisehir, Turkey

Purpose/Objective:

Organ-preserving treatment approaches in cancer treatment have gained importance in recent years, and brachytherapy applications can be used for this purpose in the treatment of rectal cancer. In this study, we aimed to design a rectal multichannel brachytherapy applicator that can be combined with a transrectal ultrasound probe, produce it from silicone material, and perform radiation dosimetry.

Material/Methods:

In order to achieve the aim of the study, we designed a rectal multichannel brachytherapy applicator that can be used in combination with a transrectal ultrasound probe and produced it from silicone material. We used GAFchromic film dosimetry and MOSFET dosimetry to evaluate dose permeability. After placing an interstitial tube into one of the peripheral channels selected randomly, a 3 Gy dose was defined to 2 different (right-left) points on images obtained from planning tomography images of the applicator, and the obtained TPS results were recorded. The activity of the radioactive source at the time of planning was 9.3 Curie, and the irradiation times were 5.4 seconds for the right side and 16.5 seconds for the left side.

Results:

Sequential irradiations were performed, and the reading results of the GAFchromic film and MOSFET detector irradiation as using the times obtained from TPS are presented in Table 1.

Table 1. GAFchromic film and MOSFET dosimetry results