DIRECTT-Rekonstruktionen im Vergleich zur gefilterten Rückprojektion
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Axel Lange
, Andreas Kupsch , Manfred P. Hentschel and Bernd R. Müller
Kurzfassung
Anhand von computertomografischen Messungen und Modellrechnungen werden DIRECTT-Rekonstruktionen im Vergleich mit gefilterten Rückprojektionen bewertet. Dazu wird die Rekonstruktionsqualität mittels einer zirkular erweiterten Modulations-Transfer-Funktion (MTF) und mit integralen Kenngrößen im Radon- und im Ortsraum verglichen. Zur Überprüfung der Rekonstruktionsgenauigkeit experimenteller Daten werden Mustermessungen einfacher Probengeometrien unter definierten physikalischen Bedingungen durchgeführt. Diese beinhalten die Monochromasie, die Unterdrückung von Kantenartefakten und die radiometrische Intensitätsbestimmung. Für die Qualität der Rekonstruktionen mittels DIRECTT erweisen sich sowohl unterschiedliche Rekonstruktionsfilter als auch der Verzicht auf jede Filterung als unerheblich, im Gegensatz zur gefilterten Rückprojektion.
Abstract
Based on measurements and on model calculations tomographic reconstructions by DIRECTT (direct iterative reconstruction of computed tomography trajectories) are evaluated in comparison to filtered back projection. This is established by modified circular Modulation Transfer Functions (MTF) and by integral parameters in Radon and real space. The reconstructions of the experimental data refer to measurements of simple shapes under well defined physical conditions such as monochromatic radiation, suppression of refractive edge artifacts and radiometric intensity measurement. The quality of DIRECTT reconstructions does not primarily depend on the type of filters applied nor their abandonment, which differs essentially from the performance of the filtered back projection.
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© 2014, Carl Hanser Verlag, München
Articles in the same Issue
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- Effects of Zn/Cu Ratio and Silicon on Microstructure, Mechanical Properties, Tarnish and Corrosion Resistance of As-Cast 940 Silver Alloys
- Analysis of the Frequency as an Integral Method for the Testing of Anisotropic 3D Sheet Metal Structure
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- DIRECTT-Rekonstruktionen im Vergleich zur gefilterten Rückprojektion
- Reduzierung von Missing-Wedge-Artefakten der CT mit DIRECTT
- Röntgentomografische Untersuchung eines kommerziellen Lithium-Ionen-Kondensators*
- Machining Parameter Optimization of Bidirectional CFRP Composite Pipe by Genetic Algorithm
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- Taguchi-Based Grey Relation Optimization of Machining Parameters and Cutting Path Strategies in CNC Pocket Milling Operations
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- Vorschau/Preview
- Vorschau
Articles in the same Issue
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Burst Strength of Composite Cylinders – Assessment of the Type of Statistical Distribution
- Effects of Zn/Cu Ratio and Silicon on Microstructure, Mechanical Properties, Tarnish and Corrosion Resistance of As-Cast 940 Silver Alloys
- Analysis of the Frequency as an Integral Method for the Testing of Anisotropic 3D Sheet Metal Structure
- Mechanical and Thermal Properties of a Cu-CNT Composite with Carbon Nanotubes Synthesized by CVD Process
- The Mechanical and Electrical Properties of the Ternary Bi-Ga-Sb System
- Experimental Investigation of the Corrosion Mechanism of Cemented Soils in Magnesium Sulfate Solution
- Experimental and Analytical Study of Masonry Constructions Reinforced with Bed Joints
- The Fracture Toughness of Fe2B Formed on Boronized AISI 304
- Effects of Ferroboron and Ferrochromium Powder Addition on Abrasive Wear Resistance of Fe-Based Hardfacing Coatings
- Fabrication of Al/Mg Bimetal Compound Casting by Lost Foam Technique and Liquid-Solid Process
- Effects of Si and Zn on Machinability and Wear Resistance of AZ91 and AS91 Magnesium Alloys
- DIRECTT-Rekonstruktionen im Vergleich zur gefilterten Rückprojektion
- Reduzierung von Missing-Wedge-Artefakten der CT mit DIRECTT
- Röntgentomografische Untersuchung eines kommerziellen Lithium-Ionen-Kondensators*
- Machining Parameter Optimization of Bidirectional CFRP Composite Pipe by Genetic Algorithm
- Investigation of Lost Foam Casted Aluminum Bimetal Microstructures
- Taguchi-Based Grey Relation Optimization of Machining Parameters and Cutting Path Strategies in CNC Pocket Milling Operations
- Reliable Evaluation of Acceptability of Weld for Final Disposal Based on the Canister Copper Weld Inspection Using Different NDT Methods
- Evaluation of the Reliability of NDTesting in Russian Railway Transport
- Vorschau/Preview
- Vorschau