ESTRO 2024 - Abstract Book

S3538

Physics - Dose prediction, optimisation and applications of photon and electron planning

ESTRO 2024

genitourinary (GU) toxicity was observed in eight patients (six G1 and two G2), mainly consisting of increased urgency and frequency.

Table 1. Plan goals and characteristics.

Conclusion:

24 Gy single-dose ablative radiation therapy irradiation of the whole prostate was feasible and well tolerated. The volume of rectal mucosa receiving critical doses was limited by the use of an HDAZ in patients with good bowel preparation, without using invasive devices such as hydrogel spacer or endorectal balloon. The accomplishment of urethra sparing with a 20% dose reduction to minimize GU toxicity is feasible through appropriate catheter guided imaging procedures and online tracking during treatment delivery. Our preliminary findings offer encouraging perspectives and the long-term results of this study will certainly shed light on the efficacy and safety of 24 Gy SDART in the treatment of localized PCa.

Keywords: PCa SBRT, urethra-sparing, single ablative dose

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Digital Poster

Dosimetric comparison among different treatment planning systems for spinal SBRT for bone metastases

Nuthathida Boonrueng 1 , Wisawa Phongpraphun 2 , Siwadol Plean-arom 2 , Jiraporn Setakornnukul 2 , Janjira Petsuksiri 2 1 Master of Science Program in Medical Physics, Division of Radiation Oncology, Faculty of Medicine Siriraj Hospital, Mahidol University, Department of Radiology, Bangkok, Thailand. 2 Division of Radiation Oncology, Faculty of Medicine Siriraj Hospital, Mahidol University, Department of Radiology, Bangkok, Thailand