The Center for Quantitative Imaging is hosting a two-day short course on X-ray CT imaging of Geo-materials with Dr. Phil Halleck, Associate Professor Emeritus of Energy and Mineral Engineering. The purpose of this course is to acquaint graduate students with basic principles of X-ray CT imaging and their application in structural and compositional characterization of rocks, soils and porous materials alike. If you and/or your students are interested in attending, please e-mail Dr. Zuleima Karpyn by Friday, April 4.
The course will be split into two sessions covering different topics:
- April 18, Friday 9-11 am
- April 25, Friday 9-11 am
The tentative table of contents is:
1. Basics of X-ray CT: What are X-rays and what are the dangers; Digital X-ray images; X-ray attenuation, Beer's law, attenuation coefficient, CT numbers, Compton scattering, and the Photoelectric effect; Why we care; Tomography; How scanners work; How X-rays are produced; How the data are converted to images.
2. Adjusting the settings on a scanner to optimize for your purpose: Excitation voltage, tube current; rotation speed (number of views),; fan angle; field of view; reconstruction settings
3. Resolution and Contrast: pixel size versus resolution; density contrast; composition contrast; effect of reconstruction filters; effects of noise; feature detection versus measurement.
4. Dual Energy scanning to map density and atomic number: Review of physical basis of absorption coefficient; Derivation of density and mean atomic number equations in terms of dual energy scan data. Deriving empiracel coefficients; Illustration of density and mean-atomic-number images
5. Measurement of Porosity and Saturation: Derivation of equations based on subtractive imaging. Illustration