Axelsson B, Forsberg H, Hansson B, Haverling M
Department of Hospital Physics, Karolinska Sjukhuset, Stockholm, Sweden.
Acta Radiol. 1991 Jan;32(1):12-7.
The large difference in transmission between the mediastinum and the part of the chest mainly containing lungs causes major problems in chest radiography. A system for advanced multiple beam equalization radiography has been evaluated. Evaluation of image quality has been performed both using standard phantoms and from clinical radiographs. Measurements of radiation dose burden to the patient have been made both in clinical examinations and using an anthropomorphic phantom. The image quality, in areas with low transmission, is substantially increased using the equalization system. In parts of the chest mainly containing lung tissue, conventional systems show an equal or slightly better image quality. The radiation dose burden to the patient is increased by 25 percent using the equalization system, as compared to a low-dose air-gap system. In our opinion, the slight increase in radiation dose burden is well motivated by the high overall quality of the radiographs produced.
纵隔与胸部主要包含肺部的部分之间在透射方面的巨大差异给胸部X线摄影带来了重大问题。一种先进的多束均衡射线摄影系统已得到评估。已使用标准体模并从临床X线照片对图像质量进行了评估。已在临床检查中并使用拟人化体模对患者的辐射剂量负担进行了测量。使用均衡系统时，低透射区域的图像质量大幅提高。在胸部主要包含肺组织的部分，传统系统显示出相同或略好的图像质量。与低剂量气隙系统相比，使用均衡系统时患者的辐射剂量负担增加了25%。我们认为，所产生的X线照片总体质量较高，因此辐射剂量负担的轻微增加是完全合理的。
