Dissertation > Excellent graduate degree dissertation topics show

Cone-Beam Phase Computed Tomography Based on Grating Imaging

Author: ChenXin
Tutor: SunZuo;ZhuPeiPing
School: Dalian University of Technology
Course: Communication and Information System
Keywords: X-ray Grating Imaging Cone-Beam Phase CT Filtered Back-Projection
CLC: TP391.41
Type: Master's thesis
Year: 2007
Downloads: 97
Quote: 0
Read: Download Dissertation

Abstract


X-ray phase contrast imaging always provides high density resolution when images weakly absorbing material, which shows wide prospect of application in many fields such as medicine, biology and material science. However, due to the particular principle and structure of interferometic imaging method, diffraction enhanced imaging method and in-line imaging method, these methods need either highly coherent or highly monochromatic X-ray, and can not provide a large field of view. None of them is widely used. Grating imaging overcomes the limitations of above imaging methods and enables phase contrast imaging to develop into the form of cone-beam imaging. At present, there has been no cone-beam reconstruction algorithm based on this imaging pattern. However, grating imaging will be applied in cone-beam scanning and become a main phase contrast imaging method as long as theory is deeply investigated and the technique of fabricating grating is developed. At that time, cone-beam phase CT will draw more attention in CT theory and application fields. Therefore, research of cone-beam phase CT is significant and practical.This paper works on phase contrast imaging and phase contrast CT. In research of phase contrast imaging, diffraction enhanced imaging and grating imaging are discussed, which includes differences between these two imaging methods, advantages of phase contrast imaging, and the prospect of developing grating imaging into cone-beam imaging pattern; In research of phase contrast CT, reconstruction of phase item and its gradient in diffraction enhanced imaging is studied firstly, and then, with the foundation of phase item direct reconstruction algorithm of parallel-beam phase CT, characteristic of cone-beam phase imaging and the theory of FDK reconstruction algorithm, this paper derives reconstruction algorithm of cone-beam phase CT based on grating imaging, this method is filtered back-projection type and can reconstruct the phase item of object directly with the phase gradient as projection. Moreover, because present phase contrast imaging methods belong to parallel-beam imaging in nature, a projection simulation method of cone-beam grating imaging is provided as well, which can simulate refraction projection with phase item, this makes for the research of reconstruction algorithm.

Related Dissertations

  1. Investigations of Structure and Glass Forming Abilty of Amorphous Alloys,TG139.8
  2. Study on Protective Effects of Apple Polyphenol on Immune System Injury Caused by γ-Ray,S661.1
  3. Assessment of Carotid Atherosclerotic Plaques with Multi-slice Spiral Computed Tomography Angiography and the Correlation of Ischemic Cerebrovascular Disease,R816.1
  4. Research on Interstitial Lung Disorders of the Secondary Pulmonary Tuberculosis in HRCT,R521
  5. 16 -slice spiral CT MPR technique in the diagnosis of appendicitis clinical value,R656.8
  6. Study of Quality Control of 64-slice CT Coronary Angiography in Diagnosis of Rheumatic Heart Disease Abstract,R816.2
  7. Uniform Image Quality Achieved by Individual Tube Current Modulation in Coronary CT Angiography: Preliminary Study,R816.2
  8. Experimental Study on the Effect and Mechanism of Bone Marrow Mesenchymal Stem Cells Treating the Rats β-irradiated Skin Injury,R641
  9. Primary Study on the Radioprotection Effect and Its Mechanism of Rosmarinic Acid against Gamma Ray Induced DNA Damage,R818
  10. Research of Non-destructive Testing Detector for Powerful X-ray Conveyor Belt,TH878
  11. Analysis of Wireless Channel Based on Frequency Domain Shooting-and-Bouncing Ray,TN929.5
  12. Medical Image Volume Rendering Research and System Implementation Based on GPU,TP391.41
  13. Effect of Hydrogen Peroxide and X-ray on Calcium Oscillation in Airway Epithelial Cells and Pulmonary Macrophages,R563.9
  14. Research on Radar Detection Performance on Complex Terrain,TN974
  15. Joint Tomography with Seismic First-break and Reflection Travel-time,P631.4
  16. Inspection of Poultry’s Quality Based on X-ray and Near Infrared Spectroscopy Technology,TS251.7
  17. Influence of Different Contrast’s Agent Dose on Multi-slice Spiral CT Liver Perfusion Image: An Experimental Study,R816.5
  18. Diagnostic Value of CT in Intestinal Obstruction,R656.7
  19. Clinical Study of the Diagnosis of Coronary Heart Disease with Dual-source Computed Tomography,R541.4
  20. Research on the KTP Crystal Applied in THG of Nd:YAN 1319nm Laser,TN248
  21. Crystallographic Analysis of Enoyl-Acyl Carrier Protein Reductase (FabV) from Xanthomonas Oryzae,S435.111.4

CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
© 2012 www.DissertationTopic.Net  Mobile