Polymer gel dosimetry in proton beams

聚合物凝胶剂量学是一种新型的三维剂量学方法，它利用与辐射剂量成正比的链式聚合反应来保证剂量的质量。本研究的目的是在临床质子剂量学中进行聚合物凝胶的剂量学研究。在这项研究中，我们计算R2图像从两个和四个采集的MR图像使用内部程序。我们比较了两幅图像和四幅图像的程序化R2图像。两幅图像的R2图像与四幅图像的R2图像相同。我们可以使用来自两个图像的R2图像来减少扫描时间。我们使用X射线CT扫描仪进行剂量阅读方法进行质子束测量，其中可以进行薄片数据收集。此外，我们使用体绘制构建了聚合物凝胶的3D图像。因此，通过薄片的收集，我们可以获得更详细的3D数据。然而，我们发现，在薄的切片厚度和小的体素，周围的体素的信噪比（SNR）恶化。

Polymer gel dosimetry which utilizes chain polymerization that is proportional to radiation dose is a new three-dimensional(3D) dosimetric tool for quality assurance. The purpose of this study was to carry out dosimetry of polymer gels in clinical proton dosimetry. In this study, we caluculated R2 iamges from two and four acquired MR images using an in-house program. We comared the programmed R2 image from two iamges with that from four images. The R2 image from two images was same as that from four images. We can use the R2 image from two images for reduction of scan time. And we performed dose reading method using an X-ray CT scanner for proton beam measurements, in which data collection of thin slices is possible. In addition, we constructed 3D images of polymer gels using volume rendering. As a result, through the collection of thin slices, we could acquire more detailed 3D data. However, we found that at thin slice thicknesses and small voxel, the signal to noise ratio(SNR) around voxels deteriorated.