Interesting properties of tissues can sometimes be revealed by imaging them at t

Question

Interesting properties of tissues can sometimes be revealed by imaging them at two x-ray energies. Suppose you are going to use your conventional chest x-ray setup to make two films, one where the highest x-ray energies are at 30 keV and the other where the highest energies are at 100 keV. (a) In order to make these two images, what physical parameter will you change and to what values will you set it? (b) Assuming nothing else changes, which film would you expect to be more exposed than the other? Explain. (c) At which energy is Compton scattering more of a problem? Describe how it will affect that image.

Explanation / Answer

a) since the energy is different, therefore path length should be altered.

L'= L/cos

b) Exposure is directly related to ionization capacity. more energy, more ionization, more exposure

c) low energy, as the recoiling energy will be very less for the electron

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