Optical imaging of water during X-ray beam irradiations from linear accelerator
Optical imaging of water during X-ray beam irradiations from linear accelerator
复制标题
直线加速器 X 射线束照射期间水的光学成像
DOI：
10.1016/j.nima.2017.07.059
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Oguchi Hiroshi
中科院分区：
文献类型：
--
作者：
Yamamoto Seiichi;Okudaira Kuniyasu;Kawabata Fumitaka;Nakaya Takayoshi;Oguchi Hiroshi
对于直线加速器(直线加速器)产生的高能X射线束，剂量分布的测量对于系统的质量评估(QA)是很重要的。虽然电离室通常用于这一目的，但测量需要相对较长的时间来获得数据，特别是对于二维或三维剂量分布。为了解决这个问题，我们在直线加速器的高能X射线束照射过程中对水进行了光学成像。我们用直线加速器系统将一个水模放置在桌子上，并用高灵敏度的冷却电荷耦合器件(CCD)相机测量了X射线从上方照射到水模时的水的光学图像。对不同能量和剂量的X射线束进行了测量。我们还测量了直线加速器系统多叶准直器移动时的动态图像，以评估其在更实际条件下的性能。然后通过更换滤光片，测量了水的X射线光学图像的光谱。在所有不同能量和剂量的X射线照射下，我们都可以在水中获得清晰的光学图像。图像的侧貌与计划系统计算的结果基本一致。然而，在更深的区域，深度剖面略小。在移动多叶准直器的同时，我们获得了动态图像。在X射线照射过程中，图像的光谱与切伦科夫光的光谱相似。不同波长的光在深度分布上没有显著差异。在X射线束照射过程中的水的光学成像有可能用于光束的横向轮廓。此外，在更深的地区估计略有低估的深度剖面也可能是有用的。在X射线照射过程中移动多叶准直器的动态光学成像是可能的。
Measurements of dose distribution are important for high energy X-ray beam from linear accelerators (LINAC) for quality assessment (QA) of the system. Although ionization chambers are commonly used for this purpose, measurements need relatively long time to obtain the data especially for the two- or three-dimensional dose distributions. To solve the problem, we conducted optical imaging of water during irradiations of high energy X-ray beam from a LINAC. We placed a water phantom set on a table with a LINAC system, and optical images of water were measured with a high-sensitivity cooled charge coupled device (CCD) camera during X-ray beam irradiations to the water phantom from the upper side. Measurements were made for different energies and doses of X-ray beams. We also measured dynamic images while moving the multi-leaf collimators of the LINAC system to evaluate the performance for more practical condition. Then we measured the light spectra of the optical images of water for X-ray beam by changing the optical filters. In all irradiations of different energies and doses of X-ray beam, we could obtain clear optical images in water. The lateral profiles of the images were almost identical to those calculated by planning system. However the depth profiles were slightly smaller at the deeper area. We obtained dynamic images while moving the multi-leaf collimators. The light spectrum of the image during X-ray beam irradiation was similar to that of the Cerenkov-light. There was not a significant difference in the depth profiles between different wave lengths of light. Optical imaging of water during irradiations of X-ray beam has a potential to be used for the lateral profile of the beams. Also it might be useful to estimate the depth profiles with slight under estimations at deeper areas. Dynamic optical imaging while moving the multi-leaf collimators during irradiation of X-ray were possible.
能量低于切伦科夫光阈值的 X 射线光子照射期间水的发光成像
DOI：
10.1016/j.nima.2016.06.128
发表时间：
2016
影响因子：
1.4
作者：
S. Yamamoto;S. Koyama;M. Komori;T. Toshito
通讯作者：
T. Toshito
影响因子：
3.5
作者：
Gore, JC;Ranade, M;Schulz, RJ
通讯作者：
Schulz, RJ