Investigating the method of selection of background pixel values for the calibration of EBT‐XD film dosimetry
Year: 2024
Type: article
Abstract: Purpose: This study investigates three different calibration methods for the selection of background pixel intensity. Methods: Film-by-Film (FBF) Method: Each film serves as its own control. Batch-by-Film (BBF) Method: A single film is used as a control for all calibration films. Generic (GEN) Method: A generic value (65535) is used as the background pixel value for all calibration films.Three calibration curves were established for the red, green, blue, and RGB channels, and the Radbard NIH (image) curve-fitting model was used to predict the dose. Sensitivity at different dose levels was quantified by calculating the first derivative of each color channel. Results: <0.0001) from those of the FBF and BBF methods. In the dose range 5-30 Gy, the percentage difference between the predicted and delivered doses for the FBF, BBF, and GEN methods was within 2%. Both the red and green channels demonstrated higher sensitivity than the blue channel over the dose range of 2-30 Gy. Conclusions: The FBF method is more accurate than the BBF and GEN methods because it accounts for inter-film variations. The Radbard NIH (image) curve-fitting function proved suitable for predicting the dose for all the three calibration methods.
Source: Precision Radiation Oncology
DOI: 10.1002/pro6.1236
Authors: Sathiya Raj, Nithya Shree, Ganesh Kadirampatti
Institution: Kidwai Memorial Institute of Oncology
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4401523888