Brown P H, Thomas R D, Silberberg P J, Johnson L M
Department of Diagnostics Radiology, Oregon Health Sciences University, Doernbecher Children's Hospital, Portland 97201-3098, USA.
Pediatr Radiol. 2000 Apr;30(4):229-35. doi: 10.1007/s002470050728.
A new children's hospital provided the impetus to investigate radiation dose and image quality in a fluoroscope that was specially engineered for pediatric fluoroscopy. Radiation protection management recommends radiation exposures that are as low as reasonably achievable, while still maintaining diagnostic image quality.
To obtain comparative phantom imaging data on radiation exposure and image quality from a newly installed fluoroscope before and after optimization for pediatric imaging.
Images were acquired from various thickness phantoms, simulating differing patient sizes. The images were evaluated for visualization of high- and low-contrast objects and for radiation exposure. Effects due to use of the image intensifier anti-scatter grid were also investigated.
The optimization of the new fluoroscope for pediatric operation reduced radiation exposure by about 50% (compared to the originally installed fluoroscope), with very little loss of image quality. Pulsed fluoroscopy was able to lower radiation dose to less than 10% of continuous fluoroscopy, while still maintaining acceptable phantom image quality.
Radiation exposure in pediatric fluoroscopy can be reduced to values well below the exposure settings that are typically found on unoptimized fluoroscopes. Pulsed fluoroscopy is considered a requisite for optimal pediatric fluoroscopy.
一家新建的儿童医院促使人们对一台专门为儿科透视设计的荧光透视仪的辐射剂量和图像质量进行研究。辐射防护管理建议在保持诊断图像质量的同时，尽可能降低辐射暴露剂量。
获取一台新安装的荧光透视仪在针对儿科成像进行优化前后，关于辐射暴露和图像质量的对比体模成像数据。
从模拟不同患者体型的各种厚度体模获取图像。对图像进行高对比度和低对比度物体可视化以及辐射暴露评估。还研究了使用影像增强器防散射格栅的效果。
新荧光透视仪针对儿科操作进行优化后，辐射暴露降低了约50%（与最初安装的荧光透视仪相比），图像质量损失极小。脉冲透视能够将辐射剂量降低至连续透视的10%以下，同时仍保持可接受的体模图像质量。
儿科透视中的辐射暴露可降低至远低于未优化的荧光透视仪通常设置的值。脉冲透视被认为是最佳儿科透视的必要条件。
