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Published in last 50 years
Compton scatter tomography : by S. G. MIRELL and W. H. BLAND, Nuclear Medicine Service, VA Wadsworth Hospital Center, and UCLA School of Medicine, Los Angeles, California, U.S.A.
The electron density (e cm-3) of a tissue sample can be determined by measuring the fluence of photons which it Compton scatters from a narrow incident beam of X- or gamma -radiation. The physics of Compton scatter tomography is examined with emphasis on transverse section scanning. The two major limitations of the scatter technique, attenuation of the single scatter photon fluence (of interest), and contamination of this fluence by multiply-scattered photons, are studied and corrective procedures are proposed. The methods described are applied to a simple test phantom; it is concluded that transverse images with an electron density precision of approximately 5% are possible.