Effect of scanning parameters on dose-response of radiochromic films irradiated with photon and electron beams.
Effect of scanning parameters on dose-response of radiochromic films irradiated with photon and electron beams.
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DOI：
10.1016/j.heliyon.2018.e00864
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发表时间：
2018-10
期刊：
影响因子：
4
通讯作者：
Rahman WN
中科院分区：
文献类型：
--
作者：
Tagiling N;Ab Rashid R;Azhan SNA;Dollah N;Geso M;Rahman WN
在放射治疗中，适当的剂量学设置对于确保准确的辐射剂量传递至关重要。这项工作评估了扫描参数在读取临床光子和电子束照射的EBT2和EBT3放射变色薄膜(RCFs)的剂量响应时的影响因素。使用Epson®Expression®10000XL平板扫描仪对RCFs进行数字化，并使用胶片类型、分辨率、图像位深度、彩色到灰度转换和图像反转等五个扫描参数进行净光密度(NetOD)的图像分析。结果表明，增加空间分辨率和加深色深并没有提高胶片的感光度，而灰度扫描导致感光度低于红色通道的感光度。同样明显的是，反转和彩色底片类型的选择否定了netOD值，因此不适合扫描RCFs。总之，选择合适的扫描参数对于保持胶片剂量测量的精确性和重复性是很重要的。
Proper dosimetry settings are crucial in radiotherapy to ensure accurate radiation dose delivery. This work evaluated scanning parameters as affecting factors in reading the dose-response of EBT2 and EBT3 radiochromic films (RCFs) irradiated with clinical photon and electron beams. The RCFs were digitised using Epson® Expression® 10000XL flatbed scanner and image analyses of net optical density (netOD) were conducted using five scanning parameters i.e. film type, resolution, image bit depth, colour to grayscale transformation and image inversion. The results showed that increasing spatial resolution and deepening colour depth did not improve film sensitivity, while grayscale scanning caused sensitivity reduction below than that detected in the Red-channel. It is also evident that invert and colour negative film type selection negated netOD values, hence unsuitable for scanning RCFs. In conclusion, choosing appropriate scanning parameters are important to maintain preciseness and reproducibility in films dosimetry.