Speaker
Description
Recent studies on smartphone-based film dosimetry have demonstrated the feasibility of using mobile camera imaging to estimate on-site radiation dose from radiochromic films, particularly Gafchromic EBT model, using different smartphone cameras in indoor environments. We developed a smartphone application integrated with a portable scanner that incorporated a reference-based calibration framework. This approach can offer a low-cost, portable, and rapid analysis of two-dimensional dose distribution. However, a major limitation of current smartphone dosimetry techniques is their reliance on device-specific camera characteristics, including sensor response, optical properties, automatic exposure control, and internal image-processing algorithms. This variability can significantly affect optical density measurements, leading to inconsistent dose estimates across different smartphone models and limiting reproducibility and standardization, particularly in the low-dose region where signal variations are more critical. The application being developed by our team helps standardize the dosimetry process by controlling image capture within a fixed scanner setup and applying reference-based normalization to reduce differences between smartphone cameras. It helps analyze images by selecting the region of interest and measuring the color channel intensities to improve measurement consistency and accuracy. Calibration data and dose-response conversion are built into the application, enabling immediate dose calculation after image capture without additional software. The portable scanner provides stable positioning and controlled lighting, reducing the effect of ambient light and ensuring consistent imaging conditions. By combining dedicated hardware with integrated software, the system improves measurement reliability and sensitivity while maintaining simplicity and portability. This progress provides a practical alternative to the conventional method using flatbed scanners and extends smartphone-based dosimetry to outdoor and resource-limited environments.