Research of Direct Volume CT with Point Detectors and Trough-like X-ray Source Scanning at Two Positions

XU Hao; ZHUANG Tian-ge; CHAI Xin-yu

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Research of Direct Volume CT with Point Detectors and Trough-like X-ray Source Scanning at Two Positions

更新时间：2025-07-16

- Research of Direct Volume CT with Point Detectors and Trough-like X-ray Source Scanning at Two Positions
- Acta Electronica Sinica Vol. 30, Issue 10, Pages: 1536-1539(2002)
- 作者机构：
  
  上海交通大学生物医学工程系,上海,200030
- 作者简介：
- 基金信息：
- DOI：
  CLC： R814.42
- Published：2002
- 稿件说明：
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XU Hao, ZHUANG Tian-ge, CHAI Xin-yu. Research of Direct Volume CT with Point Detectors and Trough-like X-ray Source Scanning at Two Positions[J]. Acta Electronica Sinica, 2002, 30(10): 1536-1539.
DOI：

XU Hao, ZHUANG Tian-ge, CHAI Xin-yu. Research of Direct Volume CT with Point Detectors and Trough-like X-ray Source Scanning at Two Positions[J]. Acta Electronica Sinica, 2002, 30(10): 1536-1539. DOI：

摘要

目前直接体积CT主要存在两大困难:一是如何获得三维图像精确重建所需的投影数据

包括扫描方式的可实现性;二是如何尽量避免康普顿散射对重建图像质量的影响.针对这些问题

本文提出一种新型的直接体积CT成像模式

即采用X线栅形扫描的柱面源、一组分布在大圆和垂直圆弧上的多个点状探测器采集数据

通过柱面源的一次旋转即可得到完全的投影数据.本文对该扫描装置的结构中X线柱面源的形状和尺寸、探测器的个数和位置分布进行了详细的说明

并对该装置的完全性条件进行论证.然后结合此扫描结构的特点

给出一种三维图像重建算法.计算机仿真实验的结果表明

该扫描结构在保证投影数据完全的条件下

实现了机械转动次数最少、有效抑制康普顿散射、提高三维图像重建速度和精度的目的

使直接体积CT的成像速度和重建精度比现有模式大大提高.

Abstract

Now the existing direct volume CT methods face two difficulties:first

how to get the projection data to reconstruct the 3D image exactly

including whether the scanning structure is practical;second

how to reduce the effect of Compton scatter on reconstruction image.To these difficulties

we propose a novel imaging mode of cone-beam volume CT in this paper.It adopts a columned plane source with X-ray grid scanning on it

and a group of point detectors distributing on a large circle plus an orthogonal arc.Through the columned plane source rotates one time

full projection data could be acquired.This paper gives the structure of the device

explains the shape and dimension of columned plane X-ray source in detail

shows the distributing of detectors

and proves that this structure satisfies the complete condition.Then according to the characteristics of this scanning structure

a fast reconstruction algorithm is given.The computer simulations indicate that in the condition of sufficient projections

this structure could achieve optimal combination of the following three:minimal rotating times

restrained Compton scatter

and improved image reconstruction.It greatly improves image reconstruction speed and precision compared with conventional scanning structures.

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