%0 Journal Article
%T Is It Possible to Publish a Calibration Function  for Radiochromic Film?
%A Maria F. Chan
%A David Lewis
%A Xiang Yu
%J International Journal of Medical Physics,Clinical Engineering and Radiation Oncology
%P 25-30
%@ 2168-5444
%D 2014
%I Scientific Research Publishing
%R 10.4236/ijmpcero.2014.31005
%X <p class=\"MsoNormal\">
	<span style=\"font-family:Verdana;\" lang=\"EN-US\">Purpose: </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">To assess the possibility of using a public
calibration function for radiochromic film dosimetry in dose QA of highly
conformal treatment plans. Methods: EBT3
film calibration strips (3.5</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">กม</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">20</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">cm</span><sup><span style=\"font-family:Verdana;\" lang=\"EN-US\">2</span></sup><span style=\"font-family:Verdana;\" lang=\"EN-US\"> from lots A101212 and A011713) were exposed on a Varian Trilogy at a facility
to a 10</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">กม</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">10</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">cm</span><sup><span style=\"font-family:Verdana;\" lang=\"EN-US\">2</span></sup><span style=\"font-family:Verdana;\" lang=\"EN-US\"> open field at doses of 80,</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">160,</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">320 cGy using 6MV photons. Together with a
strip of unexposed film from the same lot</span><span style=\"font-family:Verdana;\" lang=\"EN-US\">,</span><span style=\"font-family:Verdana;\" lang=\"EN-US\"> the exposed films were digitized in a single scan using different
Epson 10</span><span style=\"font-family:Verdana;\" lang=\"EN-US\">,</span><span style=\"font-family:Verdana;\" lang=\"EN-US\">000</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">XL scanners at two different facilities. The
dose-response data for each color-channel from each facility were generated
using the same calibration function X(D) = a + b/(D</span><span lang=\"EN-US\"> </span><span style=\"font-family:Verdana;\" lang=\"EN-US\">-</span><span lang=\"EN-US\"> </span><span lang=\"EN-US\"><span style=\"font-family:Verdana;\">c), where X(D) is the response at dose D and a, b and c are the
coefficients. Different batches of EBT3 film were exposed to a VMAT beam. These
films, plus two reference strips exposed to doses of zero and 160 cGy, were digitized
on the scanners at the two facilities. Using the multi-channel dosimetry method
and One-scan protocol
%K Dosimetry
%K Quality Assurance
%K IMRT
%K Radiochromic Film
%K Multichannel
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=42613