Characterization of stochastic noise and post-irradiation density growth for reflective-type radiochromic film in therapeutic photon beam dosimetry. Issue 10 (October 2016)

• Record Type: Journal Article
• Authors: Kamomae, Takeshi; Oita, Masataka; Hayashi, Naoki; Sasaki, Motoharu; Aoyama, Hideki; Oguchi, Hiroshi; Kawamura, Mariko; Monzen, Hajime; Itoh, Yoshiyuki; Naganawa, Shinji
• Is Part Of: Physica medica. Volume 32:Issue 10(2016)
• Page Start: 1314
• Page End: 1320
• Publication Date: 2016-10
• Subjects: Radiochromic film -- Stochastic noise -- Post-irradiation density growth -- Dosimetric uncertainty; Medical physics -- Periodicals; Biophysics -- Periodicals; Biophysics -- Periodicals; Imagerie médicale -- Périodiques; Radiothérapie -- Périodiques; Rayons X -- Sécurité -- Mesures -- Périodiques; Physique -- Périodiques; Médecine -- Périodiques; 610.153
• DOI: 10.1016/j.ejmp.2016.07.091
• Languages: English
• ISSNs: 1120-1797

Abstract

Highlights: We evaluated the dosimetric uncertainty of the reflective-type radiochromic film. The sharp increase in the pixel value occurred within the 3 h after irradiation. The uncertainty of the stochastic noise was independent of elapsed time. The uncertainty of the density growth was decreased within 1 h after irradiation. Total uncertainty decreased 1 h after irradiation and remained constant afterward. Abstract: The aim of this study is to investigate the dosimetric uncertainty of stochastic noise and the post-irradiation density growth for reflective-type radiochromic film to obtain the appropriate dose from the exactly controlled film density. Film pieces were irradiated with 6-MV photon beams ranging from 0 to 400 cGy. The pixel values (PVs) of these films were obtained using a flatbed scanner at elapsed times of 1 min to 120 h between the end of irradiation and the film scan. The means and standard deviations (SDs) of the PVs were calculated. The SDs of the converted dose scale, usd, and the dose increases resulting from the PV increases per ±29 min at each elapsed time, utime, were computed. The combined dose uncertainties from these two factors, uc, were then calculated. A sharp increase in the PV occurred within the first 3 h after irradiation, and a slight increase continued from 3 h to 120 h. usd was independent of post-irradiation elapsed time. Sharp decreases in utime were obtained within 1 h after irradiation, and slight decreases in utime were observed from 1 to 24 h after irradiation. uc first decreased 1 h after irradiation and remained constant afterward. Assuming that the post-irradiation elapsed times of all of the related measurements are synchronized within ±29 min, the elapsed time should be at least 1 h in our system. It is important to optimize the scanning protocol for each institution with consideration of the required measurement uncertainty and acceptable latency time.