𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Three-dimensional helical-scan computed tomography using cone-beam projections

✍ Scribed by Hiroyuki Kudo; Tsuneo Saito

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
914 KB
Volume
23
Category
Article
ISSN
0882-1666

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

In this paper, we propose an image reconstruction method and computed tomography (CT) equipment with high resolving power that generates three‐dimensional CT images at a high speed. In the proposed method, an X‐ray source that irradiates conical X‐rays and a two‐dimensional detector which consists of fan‐beam detector arrays stacked in the direction of the object's axis rotate continuously at the same time the bed carrying the object translates in the visual field. This method is called a helical scan because the object is fixed and the X‐rays move on a helix and the same measurement data are obtained. We have previously proposed a scanning method in which the X‐ray source moves on a helix [4, 6]. However, the physical implementation of the previous proposal was difficult because it was assumed that the X‐ray beam completely covers the object. In this paper, in order to solve this problem, the implementation of a helical scan is based on a practical model that combines continuous rotation of an X‐ray source and a two‐dimensional detector and translation of the object. We derive an approximate reconstruction method based on the convolution/back‐projection method for fan‐beam projections. We also perform simulation tests based on a model of the human head and demonstrate the effectiveness of the proposed method.

📜 SIMILAR VOLUMES

Diagnosis of fetal anomalies by three-di
Diagnosis of fetal anomalies by three-dimensional imaging using helical computed tomography
✍ Satoshi Sohda; Hiromi Hamada; Akinori Oki; Mariko Iwasaki; Takeshi Kubo 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 126 KB 👁 2 views

We present the first report on the use of helical computed tomography (CT), a new, non-invasive diagnostic technique that produces three-dimensional (3-D) images, in prenatal diagnosis. This technique was used to construct 3-D images in the prenatal diagnosis of two anomalous fetuses. The 3-D images

Parallel image reconstruction on MIMD co
Parallel image reconstruction on MIMD computers for three-dimensional cone-beam tomography
✍ C. Laurent; F. Peyrin; J.-M. Chassery; M. Amiel 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 503 KB

This paper deals with the parallel implementation of reconstruction methods in three-dimensional (3D) cone-beam tomography. Indeed, 3D reconstruction of realistic size volumes requires huge computer resources due to the voluminous data to handle, and the long processing times. Parallel computing, on

Three-dimensional tomographic image reco
Three-dimensional tomographic image reconstruction from cone beam projections by single scanning method
✍ Hiroyuki Kudo; Tsuneo Saito 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 786 KB

## Abstract The single‐scanning method has been proposed as a data acquisition method for reconstructing the three‐dimensional CT image, where a confronting pair of the cone beam X‐ray source and the planar detector are rotated on a circle surrounding the object. This paper discusses the problem of