Flat-Panel Volume CT: Fundamental Principles, Technology, and Applications
Flat-Panel Volume CT: Fundamental Principles, Technology, and Applications
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DOI：
10.1148/rg.287085004
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发表时间：
2008-11-01
期刊：
影响因子：
5.5
通讯作者：
Brady, Thomas J.
中科院分区：
文献类型：
--
作者：
Gupta, Rajiv;Cheung, Arnold C.;Brady, Thomas J.
平板容积计算机断层扫描（CT）系统具有创新的设计，允许每次旋转覆盖大体积，荧光透视和动态成像，以及高空间分辨率，允许可视化复杂的人体解剖结构，如精细的颞骨结构和骨小梁结构。简而言之，平板容积CT扫描仪可以被认为是传统的多探测器CT扫描仪，其中探测器行已被区域探测器取代。平板探测器具有宽z轴覆盖范围，可在一次轴向采集中对整个器官进行成像。其荧光透视和血管造影功能可用于术中和血管应用。此外，探测器的高容量覆盖和连续旋转可以实现动态过程的描绘，例如冠状动脉血流和全脑灌注。平板容积CT可能发挥作用的其他应用包括小动物成像、动物生存手术中的无损检测和组织工程实验。这种多功能性使一些人预测平板容积CT将在介入和术中应用中获得重要性，特别是在心脏成像、介入神经放射学、骨科和耳鼻喉科等专业中。然而，平板容积CT的对比度分辨率略低于多探测器CT，需要更高的辐射剂量才能达到相当的信噪比，较慢的闪烁体导致更长的扫描时间。
Flat-panel volume computed tomography (CT) systems have an innovative design that allows coverage of a large volume per rotation, fluoroscopic and dynamic imaging, and high spatial resolution that permits visualization of complex human anatomy such as fine temporal bone structures and trabecular bone architecture. In simple terms, flat-panel volume CT scanners can be thought of as conventional multidetector CT scanners in which the detector rows have been replaced by an area detector. The flat-panel detector has wide z-axis coverage that enables imaging of entire organs in one axial acquisition. Its fluoroscopic and angiographic capabilities are useful for intraoperative and vascular applications. Furthermore, the high-volume coverage and continuous rotation of the detector may enable depiction of dynamic processes such as coronary blood flow and whole-brain perfusion. Other applications in which flat-panel volume CT may play a role include small-animal imaging, nondestructive testing in animal survival surgeries, and tissue-engineering experiments. Such versatility has led some to predict that flat-panel volume CT will gain importance in interventional and intraoperative applications, especially in specialties such as cardiac imaging, interventional neuroradiology, orthopedics, and otolaryngology. However, the contrast resolution of flat-panel volume CT is slightly inferior to that of multidetector CT, a higher radiation dose is needed to achieve a comparable signal-to-noise ratio, and a slower scintillator results in a longer scanning time.