Luminescence imaging of water during irradiation of X-ray photons lower energy than Cerenkov- light threshold
Luminescence imaging of water during irradiation of X-ray photons lower energy than Cerenkov- light threshold
复制标题
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
复制
发表时间：
2016
影响因子：
1.4
通讯作者：
T. Toshito
中科院分区：
文献类型：
--
作者：
S. Yamamoto;S. Koyama;M. Komori;T. Toshito
使用能量低于约200 keV的最大能量的X射线光子照射的水的发光成像被认为是不可能的，因为在该能量范围内产生的二次电子不发射切伦科夫光。与此共识的假设相反，我们表明，水的发光成像可以通过能量低于120 keV的X射线照射来实现。我们把水phanomalies在一个传统的X-射线成像系统的桌子上，这些phanomalies的发光图像进行了测量与高灵敏度，冷却的电荷耦合器件（CCD）相机在X-射线光子照射在能量低于120 keV。我们还进行了这样的成像的丙烯酸块和塑料闪烁体。X射线光子照射期间拍摄的水模发光图像清晰地显示了X射线光子分布。体模的X射线光子图像的强度几乎与X射线辐照次数成比例增加。低能量X射线光子照射显示，由于水模体中的X射线吸收较高，因此在模体较深部分的发光强度较低。此外，由于丙烯酸体模的密度高于水，因此在其较深部分也出现较低强度的发光。水的发光强度是塑料闪烁体的0.005%。在能量低于120 keV的X射线光子照射期间，水的发光成像是可能的。这种发光成像方法是有前途的剂量估计在X射线成像系统。
Luminescence imaging of water using X-ray photon irradiation at energy lower than maximum energy of ~200 keV is thought to be impossible because the secondary electrons produced in this energy range do not emit Cerenkov- light. Contrary to this consensus assumption, we show that the luminescence imaging of water can be achieved by X-ray irradiation at energy lower than 120 keV. We placed water phantoms on a table with a conventional X-ray imaging system, and luminescence images of these phantoms were measured with a high-sensitivity, cooled charge coupled device (CCD) camera during X-ray photon irradiation at energy below 120 keV. We also carried out such imaging of an acrylic block and plastic scintillator. The luminescence images of water phantoms taken during X-ray photon irradiation clearly showed X-ray photon distribution. The intensity of the X-ray photon images of the phantom increased almost proportionally to the number of X-ray irradiations. Lower-energy X-ray photon irradiation showed lower-intensity luminescence at the deeper parts of the phantom due to the higher X-ray absorption in the water phantom. Furthermore, lower-intensity luminescence also appeared at the deeper parts of the acrylic phantom due to its higher density than water. The intensity of the luminescence for water was 0.005% of that for plastic scintillator. Luminescence imaging of water during X-ray photon irradiation at energy lower than 120 keV was possible. This luminescence imaging method is promising for dose estimation in X-ray imaging systems.
切连科夫利用外部光束辐射激发荧光断层扫描。
影响因子：
3.6
作者：
Demers JL;Davis SC;Zhang R;Gladstone DJ;Pogue BW
通讯作者：
Pogue BW