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The transmission and emission data are acquired simultaneously with
153Gd and 67Ga respectively. The distribution of scatter and spill
over in transmission window were estimated. The scatter function,
spillover and scatter fractions were estimated at different depth
in different media and the relationship was established. The
corrected transmission projections were reconstructed and the
corrected attenuation map was scaled to take into account the
difference in photon energies of the two radionuclides. Combined
emission images of a thorax phantom and human volunteer were
reconstructed using the OSEM algorithm. It was found that the bi-
exponential scatter function is independent of material and depth
of source. The scatter fraction and spillover both depend on the
thickness and density of attenuating material. Corrected
transmission data using an iterative process improved the contrast
and quantitative accuracy. We could conclude that transmission
based correction method can be applied to improve the attenuation
map used in attenuation correction of SPECT images.
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