Characterization of stochastic noise and post-irradiation density growth for reflective-type radiochromic film in therapeutic photon beam dosimetry

Takeshi Kamomae, Masataka Oita, Naoki Hayashi, Motoharu Sasaki, Hideki Aoyama, Hiroshi Oguchi, Mariko Kawamura, Hajime Monzen, Yoshiyuki Itoh, Shinji Naganawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1314-1320
Number of pages7
JournalPhysica Medica
Volume32
Issue number10
DOIs
Publication statusPublished - Oct 1 2016

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photon beams
Photons
dosimeters
Noise
irradiation
Growth
Uncertainty
pixels
dosage
Therapeutics
standard deviation
scanners
deviation
scanning

Keywords

  • Dosimetric uncertainty
  • Post-irradiation density growth
  • Radiochromic film
  • Stochastic noise

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Physics and Astronomy(all)

Cite this

Characterization of stochastic noise and post-irradiation density growth for reflective-type radiochromic film in therapeutic photon beam dosimetry. / Kamomae, Takeshi; Oita, Masataka; Hayashi, Naoki; Sasaki, Motoharu; Aoyama, Hideki; Oguchi, Hiroshi; Kawamura, Mariko; Monzen, Hajime; Itoh, Yoshiyuki; Naganawa, Shinji.

In: Physica Medica, Vol. 32, No. 10, 01.10.2016, p. 1314-1320.

Research output: Contribution to journalArticle

Kamomae, T, Oita, M, Hayashi, N, Sasaki, M, Aoyama, H, Oguchi, H, Kawamura, M, Monzen, H, Itoh, Y & Naganawa, S 2016, 'Characterization of stochastic noise and post-irradiation density growth for reflective-type radiochromic film in therapeutic photon beam dosimetry', Physica Medica, vol. 32, no. 10, pp. 1314-1320. https://doi.org/10.1016/j.ejmp.2016.07.091
Kamomae, Takeshi ; Oita, Masataka ; Hayashi, Naoki ; Sasaki, Motoharu ; Aoyama, Hideki ; Oguchi, Hiroshi ; Kawamura, Mariko ; Monzen, Hajime ; Itoh, Yoshiyuki ; Naganawa, Shinji. / Characterization of stochastic noise and post-irradiation density growth for reflective-type radiochromic film in therapeutic photon beam dosimetry. In: Physica Medica. 2016 ; Vol. 32, No. 10. pp. 1314-1320.
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