Mathot M, Sobczak S, Hoornaert M-T
Service de Radiothérapie, Centre Hospitalier Universitaire de Liège, Domaine Universitaire du Sart Tilman, B35, 4000 Liège, Belgium.
Service de Radiothérapie, Centre Hospitalier Universitaire de Liège, Domaine Universitaire du Sart Tilman, B35, 4000 Liège, Belgium.
Phys Med. 2014 Dec;30(8):871-7. doi: 10.1016/j.ejmp.2014.06.043. Epub 2014 Jul 11.
s: To assess performance of FilmQA Pro software for pre-treatment patient-specific quality assurance (QA), using radiochromic films and two commercial flatbed scanners. To evaluate a novel multichannel approach compared to the classical red channel evaluation.
Patient films (mostly EBT2 films, one box of EBT3) were digitalized using successively two flatbed scanners: the A4-size Epson V750 and the A3-size Epson 10000XL. Prior to patient dose verification, basic characteristics of films and scanners were investigated. Patient films were analyzed using FilmQA Pro software, which enables to use the signal from all three colour channels (Red, Green, Blue).
Compared to the red channel evaluation, multichannel evaluation presents better passing rates with regard to local gamma index. As expected, we obtained better results using A3-size scanner compared to A4-size scanner, especially when considering large region of interest. An observation of great interest was made for both scanners: after intensive use, a tilting in the blue transmittance profiles appeared in the lamp direction, making multichannel analysis unsuitable for accurate dose evaluation.
使用放射变色胶片和两台商用平板扫描仪，评估FilmQA Pro软件在患者特定预处理质量保证（QA）方面的性能。与传统的红色通道评估相比，评估一种新型多通道方法。
使用两台平板扫描仪依次对患者胶片（主要是EBT2胶片，一盒EBT3）进行数字化处理：A4尺寸的爱普生V750和A3尺寸的爱普生10000XL。在进行患者剂量验证之前，研究了胶片和扫描仪的基本特性。使用FilmQA Pro软件对患者胶片进行分析，该软件能够使用来自所有三个颜色通道（红色、绿色、蓝色）的信号。
与红色通道评估相比，多通道评估在局部伽马指数方面具有更高的通过率。正如预期的那样，与A4尺寸扫描仪相比，使用A3尺寸扫描仪获得了更好的结果，尤其是在考虑大感兴趣区域时。两台扫描仪都有一个非常有趣的观察结果：在大量使用后，蓝色透射率曲线在灯的方向上出现倾斜，使得多通道分析不适用于准确的剂量评估。
