Abstract
Radiochromic film (RC-film) is of great interest as a film-type dosimeter for radiation oncology applications. We present a two-dimensional image-based evaluation of the measurement accuracy of a commercial RC-film product (Gafchromic MD-55-2 film, ISP TECHNOLOGIES, Inc.) by using a commercial Laser Densitometer (Model 1710, Computerized Medical Systems, Inc.) as an optical density imaging system. The coefficient of variation of the density (pixel-value) in one sample was approximately 3% to 11% at 3 Gy or less, and 3% or less at 4 to 60 Gy. Although the coefficient of variation between three samples at the same dose was about 14% at 1 Gy, it decreased as the dose increased, reaching several percent. In 1 to 6 Gy samples, geometric imaging artifacts [interference (moire) patterns] were observed, and it was found that scan-sampling pitch influenced the accuracy of measurement of the density of the sample. To improve the accuracy of density measurement, sufficient knowledge about characteristic features of the density measuring system is essential.
| Original language | English |
|---|---|
| Pages (from-to) | 1533-1542 |
| Number of pages | 10 |
| Journal | Nihon Hoshasen Gijutsu Gakkai zasshi |
| Volume | 60 |
| Issue number | 11 |
| Publication status | Published - 2004 |
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Accuracy of measurement of radiochromic film density for high-energy X-rays. / Aoyama, Hideki; Azuma, Yoshiharu; Goto, Sachiko; Tahara, Seiji; Uno, Hirofumi; Inamura, Keiji; Kadohisa, Shigefumi; Nakagiri, Yoshitada; Kanazawa, Susumu; Sumimoto, Tetsuhiro; Azuma, Masami.
In: Nihon Hoshasen Gijutsu Gakkai zasshi, Vol. 60, No. 11, 2004, p. 1533-1542.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Accuracy of measurement of radiochromic film density for high-energy X-rays
AU - Aoyama, Hideki
AU - Azuma, Yoshiharu
AU - Goto, Sachiko
AU - Tahara, Seiji
AU - Uno, Hirofumi
AU - Inamura, Keiji
AU - Kadohisa, Shigefumi
AU - Nakagiri, Yoshitada
AU - Kanazawa, Susumu
AU - Sumimoto, Tetsuhiro
AU - Azuma, Masami
PY - 2004
Y1 - 2004
N2 - Radiochromic film (RC-film) is of great interest as a film-type dosimeter for radiation oncology applications. We present a two-dimensional image-based evaluation of the measurement accuracy of a commercial RC-film product (Gafchromic MD-55-2 film, ISP TECHNOLOGIES, Inc.) by using a commercial Laser Densitometer (Model 1710, Computerized Medical Systems, Inc.) as an optical density imaging system. The coefficient of variation of the density (pixel-value) in one sample was approximately 3% to 11% at 3 Gy or less, and 3% or less at 4 to 60 Gy. Although the coefficient of variation between three samples at the same dose was about 14% at 1 Gy, it decreased as the dose increased, reaching several percent. In 1 to 6 Gy samples, geometric imaging artifacts [interference (moire) patterns] were observed, and it was found that scan-sampling pitch influenced the accuracy of measurement of the density of the sample. To improve the accuracy of density measurement, sufficient knowledge about characteristic features of the density measuring system is essential.
AB - Radiochromic film (RC-film) is of great interest as a film-type dosimeter for radiation oncology applications. We present a two-dimensional image-based evaluation of the measurement accuracy of a commercial RC-film product (Gafchromic MD-55-2 film, ISP TECHNOLOGIES, Inc.) by using a commercial Laser Densitometer (Model 1710, Computerized Medical Systems, Inc.) as an optical density imaging system. The coefficient of variation of the density (pixel-value) in one sample was approximately 3% to 11% at 3 Gy or less, and 3% or less at 4 to 60 Gy. Although the coefficient of variation between three samples at the same dose was about 14% at 1 Gy, it decreased as the dose increased, reaching several percent. In 1 to 6 Gy samples, geometric imaging artifacts [interference (moire) patterns] were observed, and it was found that scan-sampling pitch influenced the accuracy of measurement of the density of the sample. To improve the accuracy of density measurement, sufficient knowledge about characteristic features of the density measuring system is essential.
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UR - http://www.scopus.com/inward/citedby.url?scp=16644383743&partnerID=8YFLogxK
M3 - Article
C2 - 15568005
AN - SCOPUS:16644383743
VL - 60
SP - 1533
EP - 1542
JO - Nippon Hoshasen Gijutsu Gakkai zasshi
JF - Nippon Hoshasen Gijutsu Gakkai zasshi
SN - 0369-4305
IS - 11
ER -