Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry 1-8-13 Surugadai Kand Chiyoda-ku, Tokyo, Japan.
Dentomaxillofac Radiol. 2021 Dec 1;50(8):20210276. doi: 10.1259/dmfr.20210276. Epub 2021 Nov 9.
The mathematical theory of CT was proposed by J. Radon in 1917. It was declared that the projection of whole data sets was needed to reconstruct CT images. Therefore, according to J. Radon's original theory, local cone beam CT (local CBCT) was impossible to achieve.In this paper, I discuss how local CBCT was discovered and developed. Its development required many technical elements, such as a turntable and X-ray television system, for basic experiments such as those on which narrow collimation theory and multifunctional panoramic tomography were based. These experiments endured many failures during development.Now, local CBCT is extremely popular in dental practice because local CBCT has a low radiation dose and high resolution. This paper introduces the technical elements and outlines the important stages during the development of local CBCT in the 1990s.
CT 的数学理论是由 J. Radon 于 1917 年提出的。他指出，重建 CT 图像需要整个数据集的投影。因此，根据 J. Radon 的原始理论，局部锥形束 CT（local CBCT）是不可能实现的。本文讨论了局部 CBCT 是如何被发现和发展的。它的发展需要许多技术元素，例如转台和 X 射线电视系统，以便进行基于窄准直理论和多功能全景断层摄影术的基本实验。在开发过程中，这些实验经历了许多失败。现在，局部 CBCT 在牙科实践中非常流行，因为局部 CBCT 的辐射剂量低、分辨率高。本文介绍了局部 CBCT 的技术元素，并概述了 20 世纪 90 年代局部 CBCT 发展过程中的重要阶段。
