ESTRO 2024 - Abstract Book

S3205

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Conclusion:

The FOFM has been shown to be a suitable candidate to provide real-time beam profile and dose monitoring for UHDR VHEE beams. This work has shown that this technology is capable of providing a linear response with increasing DPP far into the UHDR regime necessary for FLASH radiotherapy, which is not dependent on the specific energy of VHEE, nor on the instantaneous dose rate. It has also been shown to perform accurate pulse-by-pulse beam size measurements, a feature not possible with the currently used transmission ionisation monitor chambers, but one that could be necessary due to the additional quality assurance requirements that could be associated with the implementation of FLASH radiotherapy.

Keywords: Dosimetry, FLASH, Cherenkov

585

Digital Poster

Development of a Plasmonic-Enhanced Acrylic-Disk Radiation Sensor for Improved Photoluminescence

Shinhaeng Cho 1 , Ju Young Song 2 , Dongho Shin 3

1 Chonnam National University Hwasun Hospital, Radiation Oncology, Hwasun, Korea, Republic of. 2 Chonnam National University Medical School, Radiation Oncology, Gwangju, Korea, Republic of. 3 National Cancer Center, Proton Therapy Center, Goyang, Korea, Republic of

Purpose/Objective:

We applied Ag nanoparticles (AgNPs) scattering layers to an acrylic disk radiation sensor (ADRS) system and demonstrated signal enhancement of proton radiation. This study will provide a novel approach for improving the accuracy and reliability of proton beam scanning (PBS) beam dosimetry through the development of plasmonic enhanced ADRS (np-ADRS) system.

Material/Methods:

Finite-Difference Time-Domain (FDTD) simulation was performed using the Ansys Lumerical Solutions software package to optimize the plasmonic structure for enhancing visible light emission. The plasmonic structure was designed by varying the size and metal material of the nanoparticles (NPs) embedded in the acrylic-disk. To enhance the dosimetric capabilities of ADRS system, specifically Ag nanoparticles (AgNPs) are incorporated onto the surface of the acrylic-disk. Figure1 shows an illustration of the measurement experiment on the ADRS system. The lower right figure shows the process of patterning nanoparticles on acrylic-disk. Experimental characterization of the np-ADRS system verified its potential to capture and analyze emission spectra corresponding to various PBS beam energies. The size and spacing of the AgNPs are optimized to maximize amplification of the photoluminescence signal at the specific wavelength generated by the PBS beam.