Quantitative Aspects of Image Intensifier- Television-Based Digital X-Ray Imaging
Quantitative Aspects of Image Intensifier- Television-Based Digital X-Ray Imaging
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图像增强器的定量方面 - 基于电视的数字 X 射线成像
DOI：
10.1007/978-1-4684-5068-2_5
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发表时间：
1986
期刊：
影响因子：
37.8
通讯作者：
W. Henry
中科院分区：
文献类型：
--
作者：
O. Nalcioglu;W. Roeck;J. Seibert;A. Lando;J. Tobis;W. Henry
视频系统在 X 射线诊断成像中的应用已经存在相当长一段时间了。除了此类系统获得的图像的视觉诊断价值之外，X 射线视频系统还提供了从图像中提取定量信息的潜力。在本章中，我们不会处理基于距离测量的定量测定。尽管定量潜力在过去十年中一直在研究中，(1-3) 直到数字减影血管造影 (DSA)(4) 的引入才得到集中的努力。 DSA 可以通过本书其他部分讨论的各种数字图像增强方法（第 3、7 章）对血管内的少量不透射线造影剂进行可视化。图像处理发生在视频信号数字化之后。许多用户可能认为，由于输出是数字格式，因此它必须与计算机断层扫描 (CT) 系统中的数据一样准确。不幸的是，事实并非如此，原因是 CT 和基于图像增强器电视 (IT-TV) 的数字 X 射线成像系统之间存在一些基本差异。在数字透视（或射线照相）中，通常使用大面积探测器，例如 X 射线 II。由于检测几何结构较差，患者体内的散射光子严重降低了数字荧光镜系统获得的信息。
The utilization of video systems in diagnostic X-ray imaging has been around for quite some time. In addition to the visual diagnostic value of images obtained by such systems, the X-ray video systems also offer the potential for extracting quantitative information from the images. In this chapter we will not deal with quantitative determinations based on distance measurements. Even though the quantitation potential has been under investigation for the past decade,(1–3) it was not until the introduction of digital subtraction angiography (DSA)(4) that it received a concentrated effort. DSA makes it possible to visualize a small amount of radiopaque contrast agent within the vessels by means of various digital image enhancement methods which are discussed elsewhere in this book (Chapters 3, 7). Image processing takes place after the digitization of the video signal. Many users may assume that since the output is digital format, it must be as accurate as the data in computed tomography (CT) systems. Unfortunately, this is not true, and the reason is the existence of some basic differences between the CT and image intensifier—television (IT—TV)-based digital X-ray imaging systems. In digital fluoroscopy (or radiography), one usually uses large-area detectors such as an X-ray II. Due to poor detection geometry, the scattered photons within the patient seriously degrade the information obtained by a digital fluoroscopic system.
通过正电子断层扫描确定与急性心肌梗死相关的“相互”ST 段压低的含义。
影响因子：
24
作者：
Billadello,JJ;Smith,JL;Ludbrook,PA;Tiefenbrunn,AJ;Jaffe,AS;Sobel,BE;Geltman,EM
通讯作者：
Geltman,EM