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

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...

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Bibliographic Details
Published inChinese physics B Vol. 21; no. 6; pp. 588 - 594
Main Author 韩玉 闫镔 李磊 宇超群 李建新 包尚联
Format Journal Article
LanguageEnglish
Published 01.06.2012
Subjects
Acceptability
Algorithms
Computer aided tomography
Computer simulation
CT扫描
FOV
Helical
Latitude
OFS
Projection
Reconstruction
Tomography
扫描模式
物体
螺旋
重建算法
锥束CT
Online AccessGet full text
ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/21/6/068701

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Summary: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.
Bibliography:large object, multiple helical scans, reconstruction algorithm, cone-beam computed to-mography
Han Yu, Yan Bin, Li Lei, Yu Chao-Qun, Li Jian-Xin, and Bao Shang-Lian（ 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
11-5639/O4
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.
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/6/068701