|MadSci Network: Computer Science|
Vivek, Your question is an interesting idea but has a fairly significant problem. It also crosses several different fields: physics, medicine and computer science. What you suggest is like splitting color film into the different layers and extracting information from the different color layers. Color film has three layers for red, green and blue. If you are really careful you can split the film with a razor blade. Commercially it is called a color separation. If you are not so careful, you can split your fingers. The usual warnings about sharp objects and adult supervision apply. The problem is that X-rays use a very narrow range of wavelengths (colors) and black and white film. The normal X-ray source uses the Aluminum K lines for the source. The information doctors gain from an X-ray comes from the average absorption through the entire path through the subject. The fairly recent introduction of CAT scans decomposes the absorption of small regions of the subject by taking very many X-rays from many directions. Search on “tomography” for a more detailed discussion on the methods used. Tomography is used is fields other than medicine. Geophysics uses it to model both absorption and the velocity of sound through the earth. In short, your project requires a “white” source and “color” film in the X-ray region in conjunction with a tomographic solution of the resulting pictures. These are rather difficult to achieve. David
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