Frequency-domain compensation scheme for multislice helical CT reconstruction with tilted gantry

2001 ◽  
Author(s):  
Jiang Hsieh ◽  
Hui Hu
Keyword(s):  
Frequency Domain ◽  
Helical Ct ◽  
Ct Reconstruction ◽  
Compensation Scheme ◽  
Multislice Helical Ct

High Pitch Helical CT Reconstruction

2021 ◽  
pp. 1-1
Author(s):  
John W. Hayes ◽  
Juan Montoya ◽  
Adam Budde ◽  
Chengzhu Zhang ◽  
Yinsheng Li ◽  
...  
Keyword(s):  
Helical Ct ◽  
Ct Reconstruction ◽  
High Pitch

Metal artifact suppression from reformatted projections in multislice helical CT using dual-front active contours

2010 ◽  
Vol 37 (10) ◽  
pp. 5155-5164 ◽  
Author(s):  
Hua Li ◽  
Lifeng Yu ◽  
Xin Liu ◽  
Joel G. Fletcher ◽  
Cynthia H. McCollough
Keyword(s):  
Active Contours ◽  
Helical Ct ◽  
Metal Artifact ◽  
Artifact Suppression ◽  
Multislice Helical Ct

scholarly journals X-RAY CT Reconstruction by using Spatially Non Homogeneous ICD Optimization

2019 ◽  
Vol 8 (6S3) ◽  
pp. 2043-2046
Keyword(s):  
Search Algorithm ◽  
Computational Cost ◽  
Selection Criterion ◽  
Closed Form Solution ◽  
Helical Ct ◽  
Reconstruction Algorithm ◽  
Form Solution ◽  
Ct Reconstruction ◽  
Practical Applications ◽  
Voxel Selection

Recent applications of conventional iterative coordinate descent (ICD) algorithms to multislice helical CT reconstructions have shown that conventional ICD can greatly improve image quality by increasing resolution as well as reducing noise and some artifacts. However, high computational cost and long reconstruction times remain as a barrier to the use of conventional algorithm in the practical applications. Among the various iterative methods that have been studied for conventional, ICD has been found to have relatively low overall computational requirements due to its fast convergence. This paper presents a fast model-based iterative reconstruction algorithm using spatially nonhomogeneous ICD (NH-ICD) optimization. The NH-ICD algorithm speeds up convergence by focusing computation where it is most needed. The NH-ICD algorithm has a mechanism that adaptively selects voxels for update. First, a voxel selection criterion VSC determines the voxels in greatest need of update. Then a voxel selection algorithm VSA selects the order of successive voxel updates based upon the need for repeated updates of some locations, while retaining characteristics for global convergence. In order to speed up each voxel update, we also propose a fast 3-D optimization algorithm that uses a quadratic substitute function to upper bound the local 3-D objective function, so that a closed form solution can be obtained rather than using a computationally expensive line search algorithm. The experimental results show that the proposed method accelerates the reconstructions by roughly a factor of three on average for typical 3-D multislice geometries.

Multislice Helical CT in the Diagnosis of Pharyngovertebral Fistula Due to Loosening of Anterior Screw-Plate Construct

Orthopedics ◽  
2008 ◽  
Vol 31 (8) ◽  
pp. 1-3
Author(s):  
Zafer Ünsal Coskun ◽  
Serkan Bilgiç ◽  
Özkan Köse
Keyword(s):  
Helical Ct ◽  
Multislice Helical Ct

Helical CT Reconstruction with Large Cone Angle

2006 ◽  
Author(s):  
Alexander A. Zamyatin ◽  
Alexander Katsevich ◽  
Michael D. Silver ◽  
Satoru Nakanishi
Keyword(s):  
Cone Angle ◽  
Helical Ct ◽  
Ct Reconstruction ◽  
Large Cone Angle

Effect of Scan Delay on Hepatic Enhancement for Pediatric Abdominal Multislice Helical CT

2001 ◽  
Vol 176 (6) ◽  
pp. 1559-1561 ◽  
Author(s):  
Donald P. Frush ◽  
Lane F. Donnelly ◽  
George S. Bisset
Keyword(s):  
Helical Ct ◽  
Multislice Helical Ct

scholarly journals Implementation and evaluation of two helical CT reconstruction algorithms in CIVA

2016 ◽  
Author(s):  
H. Banjak ◽  
M. Costin ◽  
C. Vienne ◽  
V. Kaftandjian
Keyword(s):  
Helical Ct ◽  
Ct Reconstruction ◽  
Reconstruction Algorithms
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