中国物理B ›› 2012, Vol. 21 ›› Issue (6): 68701-068701.doi: 10.1088/1674-1056/21/6/068701

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Multiple helical scans and the reconstruction of over FOV-sized objects in cone-beam CT

韩玉a, 闫镔a, 李磊a, 宇超群b, 李建新a, 包尚联c   

  1. a. Information Engineering Institute, Information Engineering University, Zhengzhou 450002, China;
    b. Surveying & Mapping Institute, Information Engineering University, Zhengzhou 450002, China;
    c. Beijing City Key Laboratory of Medical Physics & Engineering, Peking University, Beijing 100871, China
  • 收稿日期:2011-10-22 修回日期:2012-02-21 出版日期:2012-05-01 发布日期:2012-05-01
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB707701), the National High Technology Research and Development Program of China (Grant No. 2009AA012200), and the National Nature Science Foundation of China (Grant No. 30970722).

Multiple helical scans and the reconstruction of over FOV-sized objects in cone-beam CT

Han Yu(韩玉)a), Yan Bin(闫镔)a)†, Li Lei(李磊)a), Yu Chao-Qun(宇超群)b), Li Jian-Xin(李建新)a), and Bao Shang-Lian(包尚联)c)   

  1. a. Information Engineering Institute, Information Engineering University, Zhengzhou 450002, China;
    b. Surveying & Mapping Institute, Information Engineering University, Zhengzhou 450002, China;
    c. Beijing City Key Laboratory of Medical Physics & Engineering, Peking University, Beijing 100871, China
  • Received:2011-10-22 Revised:2012-02-21 Online:2012-05-01 Published:2012-05-01
  • Contact: Yan Bin E-mail:ybspace@yahoo.com.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB707701), the National High Technology Research and Development Program of China (Grant No. 2009AA012200), and the National Nature Science Foundation of China (Grant No. 30970722).

摘要: In cone-beam computed tomography (CBCT), there are often cases where the size of the specimen is larger than the field of view (FOV) (referred to as over FOV-sized (OFS)). To acquire the complete projection data for OFS objects, some scan modes have been developed for long objects and short but over-wide objects. However, these modes still cannot meet the requirements for both longitudinally long and transversely wide objects. In this paper, we propose a multiple helical scan mode and a corresponding reconstruction algorithm for both longitudinally long and transversely wide objects. The simulation results show that our model can deal with the problem and that the results are acceptable, while the OFS object is twice as long compared with the FOV in the same latitude.

关键词: large object, multiple helical scans, reconstruction algorithm, cone-beam computed tomography

Abstract: In cone-beam computed tomography (CBCT), there are often cases where the size of the specimen is larger than the field of view (FOV) (referred to as over FOV-sized (OFS)). To acquire the complete projection data for OFS objects, some scan modes have been developed for long objects and short but over-wide objects. However, these modes still cannot meet the requirements for both longitudinally long and transversely wide objects. In this paper, we propose a multiple helical scan mode and a corresponding reconstruction algorithm for both longitudinally long and transversely wide objects. The simulation results show that our model can deal with the problem and that the results are acceptable, while the OFS object is twice as long compared with the FOV in the same latitude.

Key words: reconstruction algorithm, cone-beam computed tomography, large object, multiple helical scans

中图分类号:  (X-ray imaging)

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