Research on Conceptual Design and Image Reconstruction for 4-D Computed Tomography

4维计算机断层扫描概念设计与图像重建研究

• 批准号: 15300155
• 负责人: KUDO Hiroyuki
• 金额: $ 2.82万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15300155/
• 关键词: CT; Image Reconstruction; Image Processing; Medical Imaging; X-ray; Cone-Beam; Patient Dose; Image Sequence; ファンビーム; ショートスキャン; 4次元; コンピュータ・トモグラフィー; 4次元CT; アーティファクト; 時空間CT

Development 4-D CT scanners which can visualize motions of human organs began very recently in a few manufactures. In particular, a scanner developed by National Institute of Radiological Sciences in conjunction with Toshiba Medical Systems has a good reputation all over the world. The current 4-D CT scanners measure projection data by rotating a cone-beam x-ray source continuously on a single circular orbit as proposed by Feldkamp. However, these methods suffers from several drawbacks such as (1)image artifacts due to incompleteness of the single circular orbit, (2)insufficient time resolution, and (3)significant increase of radiation dose. To overcome these drawbacks, this research project investigates new designs of 4-D CT scanners together with associated image reconstruction techniques. These include (1)image reconstruction algorithm to reduce the Feldkamp artifacts, (2)saddle trajectories to measure complete data, (3)design of 4-D CT scanners using multiple x-ray sources to improve time resolution, and (4)region of interest x-ray exposure techniques to reduce the radiation dose. The results have been published as 9 international journal papers and 10 international conference papers. In conclusion, we believe that several innovative basic techniques for developing future 4-D CT scanners could by obtained in this research project.

一些制造商最近开始开发能够可视化人体器官运动的 4-D CT 扫描仪。特别是国立放射线科学研究所与东芝医疗系统公司联合开发的扫描仪在全世界享有盛誉。当前的 4-D CT 扫描仪通过在 Feldkamp 提出的单个圆形轨道上连续旋转锥形束 X 射线源来测量投影数据。然而，这些方法存在一些缺点，例如（1）由于单个圆形轨道的不完整性而导致图像伪影，（2）时间分辨率不足，以及（3）辐射剂量显着增加。为了克服这些缺点，该研究项目研究了 4-D CT 扫描仪的新设计以及相关的图像重建技术。其中包括 (1) 减少 Feldkamp 伪影的图像重建算法、(2) 用于测量完整数据的鞍形轨迹、(3) 使用多个 X 射线源设计 4-D CT 扫描仪以提高时间分辨率，以及 (4) 区域感兴趣的X射线照射技术可减少辐射剂量。成果已发表国际期刊论文9篇、国际会议论文10篇。总之，我们相信在这个研究项目中可以获得开发未来 4-D CT 扫描仪的几种创新基本技术。

项目成果

Enlargement of the region of accurate reconstruction in computed tomography from truncated data

扩大计算机断层扫描中截断数据的精确重建区域

• 发表时间: 2006
• 作者: Michel Defrise

Exact and approximate algorithms for helical cone-beam CT

螺旋锥形束 CT 的精确和近似算法

• 发表时间: 2004
• 作者: Hiroyuki Kudo et al.

A new class of super-short-scan algorithms for fan-beam reconstruction

一类新型的扇形光束重建超短扫描算法

• 发表时间: 2006
• 作者: Ikuko Arai

Investigation of saddle trajectories for cardiac CT imaging in cone beam geometry

锥形束几何中心脏 CT 成像鞍形轨迹的研究

• 发表时间: 2004
• 作者: Jed D.Pack et al.

A FBP-type cone-beam reconstruction algorithm with Radon space interpolation ability for axially truncated data from a circular orbit

具有Radon空间插值能力的FBP型锥束重建算法，用于圆轨道轴向截断数据

• 发表时间: 2006
• 作者: Haiquan Yang