1.Application of Exact Reconstruction Algorithm of Triple-source Helical CT in Dynamic Reconstruction
Yannan JIN ; Jun ZHAO ; Zungang LIU ; Tiange ZHUANG
Space Medicine & Medical Engineering 2006;0(06):-
Objective To reduce the artifacts produced by cardiac or respiratory motion,through the application of exact reconstruction algorithm with triple-source CT in dynamic reconstruction.Methods Simulation studies on two dynamic phantoms were performed with exact reconstruction algorithms of both single-source and triple-source spiral CT.The performance of triple-source spiral CT in dynamic reconstruction was evaluated with comparing the reconstruction results from triple-source and single-source configurations.Results The triple-source configuration could effectively reduce the artifact in dynamic reconstruction.Conclusion The results of this paper confirm the validity of the exact reconstruction algorithm of multi-source CT,which has the potential to improve the image quality in cardiac imaging and small animal imaging.
2.Dual-source variable pitch spiral CT reconstruction algorithm.
Jun ZHAO ; Zungang LIU ; Yannan JIN ; Tiange ZHUANG
Journal of Biomedical Engineering 2008;25(6):1249-1253
Computed tomography angiography (CTA) is a useful approach for diagnosing vascular diseases. In this paper, we proposed a reconstruction algorithm for dual-source spiral CT with variable pitch. The projection data are collected by the double-source double-multislice spiral CT (DSDMS-CT). However, the pitch of the DSDMS-CT is variable other than being constant. We have developed a new formula performing interpolation along Z-axis for dual-source spiral CT with variable pitch. The dual-source spiral CT with variable pitch can chase contrast bolus more flexibly and more effectively. The simulation results show the correctness and efficiency of the proposed algorithm.
Algorithms
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Coronary Angiography
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methods
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Humans
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Tomography, Spiral Computed
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instrumentation
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methods