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A study on comparison of Gafchromic EBT2 film response under single and cumulative exposure conditions.

Ganapathy K, Kurup PG, Murali V, Muthukumaran M, Velmurugan J - J Med Phys (2013)

Bottom Line: Gafchromic films are used as dosimeter for in vivo and in phantom dose measurements.To check usability of Gafchromic EBT2 films in cumulative dose measurements, three EBT2 films were exposed to a daily fraction dose of 100 cGy, 150 cGy and 200 cGy, respectively, for 4 days.Gafchromic EBT2 films can be used to measure the cumulative dose delivered over multiple fractions, when the delivered dose is uniform across the film.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiotherapy, Apollo Specialty Hospital, Chennai, India.

ABSTRACT
Gafchromic films are used as dosimeter for in vivo and in phantom dose measurements. The dose response of Gafchromic EBT2 film under single and repeated exposure conditions is compared in this study to analyze the usability of Gafchromic EBT2 films in cumulative dose measurements. The post-irradiation change in response of the film is studied for up to 4 days after irradiation. The effect of repeated exposure to scanner light on the response of the film is also studied. To check usability of Gafchromic EBT2 films in cumulative dose measurements, three EBT2 films were exposed to a daily fraction dose of 100 cGy, 150 cGy and 200 cGy, respectively, for 4 days. The dose response of the films exposed to cumulative irradiation was compared with the dose measured from films exposed to the same dose but in a single exposure. It is observed that the post-irradiation darkening of the film does not saturate and continue to take place even 4 days after irradiation. The dose measured from the EBT2 films after 4 days from irradiation was around 2% higher than the dose measured from the same films at 24 hours post-irradiation. It was also observed that the repeated exposure to scanner light does not produce any significant change in the film response. The dose response of films exposed to cumulative irradiation agrees with the dose response of films exposed to the same dose in a single irradiation with less than 3% difference. Gafchromic EBT2 films can be used to measure the cumulative dose delivered over multiple fractions, when the delivered dose is uniform across the film.

No MeSH data available.


Related in: MedlinePlus

Comparison of dose response of SEFs and CEF100 cGy
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Figure 3: Comparison of dose response of SEFs and CEF100 cGy

Mentions: The dose measured from CEF100 cGy after second, third and fourth fraction of irradiation was 206 cGy, 308 cGy and 414 cGy, respectively. The dose measured from SEF200 cGy, SEF300 cGy and SEF400 cGy to evaluate the CEF100 cGy were 205 cGy, 315 cGy and 427 cGy, respectively [Figure 3]. The dose measured from CEF150 cGy after second, third and fourth fraction of irradiation was 306 cGy, 465 cGy and 618 cGy, respectively. The dose measured from SEF300 cGy, SEF450 cGy and SEF600 cGy to evaluate the CEF150 cGy was 308 cGy, 469 cGy and 632 cGy, respectively [Figure 4]. The dose measured from CEF200 cGy after second, third and fourth fraction of irradiation was 404 cGy, 619 cGy and 818 cGy, respectively. The dose measured from SEF400 cGy, SEF600 cGy and SEF800 Gy to evaluate the CEF200 cGy were 406 cGy, 625 cGy and 842 cGy, respectively [Figure 5].


A study on comparison of Gafchromic EBT2 film response under single and cumulative exposure conditions.

Ganapathy K, Kurup PG, Murali V, Muthukumaran M, Velmurugan J - J Med Phys (2013)

Comparison of dose response of SEFs and CEF100 cGy
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3958996&req=5

Figure 3: Comparison of dose response of SEFs and CEF100 cGy
Mentions: The dose measured from CEF100 cGy after second, third and fourth fraction of irradiation was 206 cGy, 308 cGy and 414 cGy, respectively. The dose measured from SEF200 cGy, SEF300 cGy and SEF400 cGy to evaluate the CEF100 cGy were 205 cGy, 315 cGy and 427 cGy, respectively [Figure 3]. The dose measured from CEF150 cGy after second, third and fourth fraction of irradiation was 306 cGy, 465 cGy and 618 cGy, respectively. The dose measured from SEF300 cGy, SEF450 cGy and SEF600 cGy to evaluate the CEF150 cGy was 308 cGy, 469 cGy and 632 cGy, respectively [Figure 4]. The dose measured from CEF200 cGy after second, third and fourth fraction of irradiation was 404 cGy, 619 cGy and 818 cGy, respectively. The dose measured from SEF400 cGy, SEF600 cGy and SEF800 Gy to evaluate the CEF200 cGy were 406 cGy, 625 cGy and 842 cGy, respectively [Figure 5].

Bottom Line: Gafchromic films are used as dosimeter for in vivo and in phantom dose measurements.To check usability of Gafchromic EBT2 films in cumulative dose measurements, three EBT2 films were exposed to a daily fraction dose of 100 cGy, 150 cGy and 200 cGy, respectively, for 4 days.Gafchromic EBT2 films can be used to measure the cumulative dose delivered over multiple fractions, when the delivered dose is uniform across the film.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiotherapy, Apollo Specialty Hospital, Chennai, India.

ABSTRACT
Gafchromic films are used as dosimeter for in vivo and in phantom dose measurements. The dose response of Gafchromic EBT2 film under single and repeated exposure conditions is compared in this study to analyze the usability of Gafchromic EBT2 films in cumulative dose measurements. The post-irradiation change in response of the film is studied for up to 4 days after irradiation. The effect of repeated exposure to scanner light on the response of the film is also studied. To check usability of Gafchromic EBT2 films in cumulative dose measurements, three EBT2 films were exposed to a daily fraction dose of 100 cGy, 150 cGy and 200 cGy, respectively, for 4 days. The dose response of the films exposed to cumulative irradiation was compared with the dose measured from films exposed to the same dose but in a single exposure. It is observed that the post-irradiation darkening of the film does not saturate and continue to take place even 4 days after irradiation. The dose measured from the EBT2 films after 4 days from irradiation was around 2% higher than the dose measured from the same films at 24 hours post-irradiation. It was also observed that the repeated exposure to scanner light does not produce any significant change in the film response. The dose response of films exposed to cumulative irradiation agrees with the dose response of films exposed to the same dose in a single irradiation with less than 3% difference. Gafchromic EBT2 films can be used to measure the cumulative dose delivered over multiple fractions, when the delivered dose is uniform across the film.

No MeSH data available.


Related in: MedlinePlus