Reducing metal artifacts in cone-beam CT images by preprocessing projection data

2007 ◽  
Vol 67 (3) ◽  
pp. 924-932 ◽  
Author(s):  
Yongbin Zhang ◽  
Lifei Zhang ◽  
X. Ronald Zhu ◽  
Andrew K. Lee ◽  
Mark Chambers ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Ct Images ◽  
Cone Beam ◽  
Projection Data ◽  
Metal Artifacts

TH-E-330A-05: Reducing Metal Artifacts in Cone-Beam CT by Tracking and Eliminating Metal Shadows in Raw Projection Data

2006 ◽  
Vol 33 (6Part23) ◽  
pp. 2288-2288 ◽  
Author(s):  
Y Zhang ◽  
L Zhang ◽  
RX Zhu ◽  
M Chambers ◽  
L Dong
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Projection Data ◽  
Metal Artifacts

Cone Beam CT Images of Normal and Paralyzed Facial Nerves

2010 ◽  
Vol 143 (2_suppl) ◽  
pp. P228-P229
Author(s):  
Masahiro Komori ◽  
Naoaki Yanagihara ◽  
Yasuyuki Hinohira ◽  
Hiroshi Aritomo
Keyword(s):  
Cone Beam Ct ◽  
Ct Images ◽  
Cone Beam ◽  
Facial Nerves

scholarly journals The Ability of Different Observers in Measuring Dimensions of Objects and Cavities in Cone Beam-CT Images

2019 ◽  
Vol 11 (4) ◽  
pp. 139-143
Author(s):  
Fatemeh Eskandarloo ◽  
Amir Eskandarloo ◽  
Payam Amini
Keyword(s):  
Cone Beam Ct ◽  
Ct Images ◽  
Cone Beam

A new weighting scheme for arc based circle cone-beam CT reconstruction

2021 ◽  
pp. 1-19
Author(s):  
Wei Wang ◽  
Xiang-Gen Xia ◽  
Chuanjiang He ◽  
Zemin Ren ◽  
Jian Lu
Keyword(s):  
Characteristic Function ◽  
Weighting Function ◽  
Cone Beam Ct ◽  
Reconstruction Algorithm ◽  
Cone Beam ◽  
Characteristic Functions ◽  
Projection Data ◽  
Ct Reconstruction ◽  
Scanning Angle ◽  
Beam Geometry

In this paper, we present an arc based fan-beam computed tomography (CT) reconstruction algorithm by applying Katsevich’s helical CT image reconstruction formula to 2D fan-beam CT scanning data. Specifically, we propose a new weighting function to deal with the redundant data. Our weighting function ϖ ( x _ , λ ) is an average of two characteristic functions, where each characteristic function indicates whether the projection data of the scanning angle contributes to the intensity of the pixel x _ . In fact, for every pixel x _ , our method uses the projection data of two scanning angle intervals to reconstruct its intensity, where one interval contains the starting angle and another contains the end angle. Each interval corresponds to a characteristic function. By extending the fan-beam algorithm to the circle cone-beam geometry, we also obtain a new circle cone-beam CT reconstruction algorithm. To verify the effectiveness of our method, the simulated experiments are performed for 2D fan-beam geometry with straight line detectors and 3D circle cone-beam geometry with flat-plan detectors, where the simulated sinograms are generated by the open-source software “ASTRA toolbox.” We compare our method with the other existing algorithms. Our experimental results show that our new method yields the lowest root-mean-square-error (RMSE) and the highest structural-similarity (SSIM) for both reconstructed 2D and 3D fan-beam CT images.

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