Kalender W A
Institut für Medizinische Physik, Universität Erlangen-Nuremberg, Erlangen.
Radiologe. 2003 May;43(5):379-87. doi: 10.1007/s00117-003-0897-4.
Clinical CT has reached a very high performance level by now. The introduction of spiral scanning and of multirow detectors have allowed to image even large body sections in very short time and with isotropic, high spatial resolution of better than 1 mm. For further improvements with respect to detector technology the use of flat-panel detectors (FPD), which have been developed for radiographic applications, is currently under investigation. In this article we discuss the general demands on CT detectors and specifically the suitability of FPDs with respect to CT imaging. FPDs offer excellent performance for the imaging of high-contrast structures with high spatial resolution.Low-contrast resolution and dose efficiency, however, do not yet reach the level of performance of dedicated CT detectors; temporal resolution is also limited. FPDs appear primarily suited for special applications in CT as for example 3D angiography or intraoperative imaging which also allows for improvements in workflow. For standard diagnostic CT they are not to be recommended at present, last but not least for dose reasons. The respective technical developments will have to be reassessed constantly in the future. The development of detector systems which are equally suited for radiography and CT constitutes an attractive goal.
如今，临床CT已达到非常高的性能水平。螺旋扫描和多排探测器的引入使得在极短时间内就能对甚至很大的身体部位进行成像，并且具有各向同性、优于1毫米的高空间分辨率。为了在探测器技术方面进一步改进，目前正在研究将已用于射线照相应用的平板探测器（FPD）用于CT。在本文中，我们讨论了对CT探测器的一般要求，特别是FPD对于CT成像的适用性。FPD在对高对比度结构进行高空间分辨率成像方面表现出色。然而，低对比度分辨率和剂量效率尚未达到专用CT探测器的性能水平；时间分辨率也有限。FPD主要适用于CT中的特殊应用，例如三维血管造影或术中成像，这也有助于改进工作流程。对于标准诊断CT，目前不推荐使用FPD，尤其是出于剂量原因。未来必须不断重新评估各自的技术发展。开发同样适用于射线照相和CT的探测器系统是一个有吸引力的目标。
