Molsen H P
Zentralbl Neurochir. 1980;41(2):99-108.
The basis of a radiological enlargement techniques is the ultra-fine focus roentgen tube. By approaching the part of the body to be examined to the source of the X-rays it is now possible to obtain an image enlargement with a good discernability of details. Limiting factors are the higher radiation exposure of the patient and the existing limits of the resolving power. The purpose of the technique is the clear and essential improvement of the discernability of details which are already seen in conventional angiography rather than the representation of structures invisible until now. That is why the author always employs the magnification angiography after the usual angiography. If the latter does not yield a sufficient visualisation of details (e.g. supply of the vessels of certain tumours, vessels of the stem ganglia and the like) and the increased radiation exposure can be put up with, the enlargement technique is the used. An ultra-fine focus of 0.3 mm edge length, a focus-film distance of 100 cm, and a focus-object distance of 45 cm are used. The image scale is doubled to reach 2.25. The additional information obtained in angiotomography is pointed out.
放射放大技术的基础是超微焦点X射线管。通过将待检查的身体部位靠近X射线源，现在有可能获得具有良好细节分辨能力的图像放大效果。限制因素是患者较高的辐射暴露以及现有分辨率的限制。该技术的目的是显著清晰地改善在传统血管造影中已经看到的细节的分辨能力，而不是呈现迄今不可见的结构。这就是为什么作者总是在常规血管造影之后采用放大血管造影。如果后者不能充分显示细节（例如某些肿瘤的血管供应、干神经节的血管等），并且能够承受增加的辐射暴露，就会使用放大技术。使用边长为0.3毫米的超微焦点、100厘米的焦点-胶片距离和45厘米的焦点-物体距离。图像比例加倍至2.25。文中指出了在血管断层摄影中获得的额外信息。
