使用氧化物铋和纳米硫酸钡屏蔽在CT扫描期间降低辐射剂量的评价
Evaluation of Radiation Dose Reduction during CT Scans Using Oxide Bismuth and Nano-Barium Sulfate Shields
摘要：
本研究的目的是通过使用带有市售铋屏蔽的新型剂量降低纤维片（DRFS），评价CT扫描期间的辐射剂量降低和图像质量。这些DRFs由纳米硫酸钡（BaSO4）组成，填充了大氧化铋（Bi2O3）颗粒尺寸留下的空隙。使用CT电离室从聚甲基丙烯酸甲酯（PMMA）头部模型的中心在12点钟方向测量辐射剂量五次以计算平均值。根据X射线管电压和屏蔽类型，测量PMMA头部体模的CT横向图像的图像质量。从PMMA头部体模表面下的右侧和左侧区域以及位于PMMA头部体模中心12点钟方向的离子室孔中选择CT横向图像中的两个感兴趣区域。本研究的结果表明，在90 kVp、120 kVp和140 kVp条件下，新型DRFS屏蔽体比相同厚度的传统铋屏蔽体分别减少剂量15.61%、23.05%和22.71%，同时保持图像质量。此外，DRFS比常规铋的厚度高出约25%。因此，我们认为DRFS可以取代传统的铋，并可用作一种新的屏蔽。
英文摘要：
The purpose of the present study was to evaluate radiation dose reduction and image quality during CT scanning by using a new dose reduction fiber sheet (DRFS) with commercially available bismuth shields. These DRFS were composed of nano-barium sulfate (BaSO4), filling the gaps left by the large oxide bismuth (Bi2O3) particle sizes. The radiation dose was measured five times at directionss of 12 o'clock from the center of the polymethyl methacrylate (PMMA) head phantom to calculate an average value using a CT ionization chamber. The image quality measured CT transverse images of the PMMA head phantom depending on X-ray tube voltages and the type of shielding. Two regions of interest in CT transverse images were chosen from the right and left areas under the surface of the PMMA head phantom and from ion chamber holes located at directions of 12 o'clock from the center of the PMMA head phantom. The results of this study showed that the new DRFS shields could reduce dosages to 15.61%, 23.05%, and 22.71% more in 90 kVp, 120 kVp, and 140 kVp, respectively, than with a conventional bismuth shield of the same thickness, while maintaining image quality. In addition, the DRFS were produced to about 25% more thinness than conventional bismuth. We concluded, therefore, that DRFS can replace the conventional bismuth and may be utilized as a new shield.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
