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. Author manuscript; available in PMC: 2010 Jun 9.
Published in final edited form as: IEEE Trans Med Imaging. 2008 Aug;27(8):997–1002. doi: 10.1109/TMI.2007.912393

Fig. 2.

Fig. 2

Illustration of spatial harmonic imaging of the scattering distribution. Experimental setup is given in Section III. Grid line spacing in the raw image is finer than the resolution of this graph causing the faded appearance. Fourier transform of the raw image contains a primary peak at the center and harmonic peaks corresponding to the periodicity of the grid. Areas surrounding the peaks are band-pass filtered and inverse transformed into a harmonic image and a primary image. Ratio between the two is a scattering image. Profiles across the horizontal midline of the harmonic, primary, and scattering images are superimposed on the corresponding images. In this example, the vials were held in a frame of styrofoam, which was found to be an effective X-ray scattering medium. Foam frame is conspicuous in the scattering image and not so in the absorption image.