2024-03-28T21:23:09Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00023509
2023-01-16T04:13:14Z
499:500:501
Characterization of stochastic noise and post-irradiation density growth for reflective-type radiochromic film in therapeutic photon beam dosimetry
Kamomae, Takeshi
69752
Oita, Masataka
69753
Hayashi, Naoki
69754
Sasaki, Motoharu
69755
Aoyama, Hideki
69756
Oguchi, Hiroshi
69757
Kawamura, Mariko
69758
Monzen, Hajime
69759
Itoh, Yoshiyuki
69760
Naganawa, Shinji
69761
Radiochromic film
Stochastic noise
Post-irradiation density growth
Dosimetric uncertainty
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.
journal article
Elsevier
2016-10
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Physica Medica
10
32
1314
1320
http://dx.doi.org/10.1016/j.ejmp.2016.07.091
http://hdl.handle.net/2237/25708
1120-1797
https://nagoya.repo.nii.ac.jp/record/23509/files/Fig6.pdf
https://nagoya.repo.nii.ac.jp/record/23509/files/Fig5.pdf
https://nagoya.repo.nii.ac.jp/record/23509/files/Fig4.pdf
https://nagoya.repo.nii.ac.jp/record/23509/files/Fig3.pdf
https://nagoya.repo.nii.ac.jp/record/23509/files/Fig2.pdf
https://nagoya.repo.nii.ac.jp/record/23509/files/Fig1.pdf
https://nagoya.repo.nii.ac.jp/record/23509/files/Clean_manuscript-3rd.pdf
eng
https://doi.org/10.1016/j.ejmp.2016.07.091
© 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/