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EJNMMI Physics
Fig. 2 | EJNMMI Physics

Fig. 2

From: Simultaneous Tc-99m and I-123 dual-radionuclide imaging with a solid-state detector-based brain-SPECT system and energy-based scatter correction

Fig. 2

Concept of modified TEW method: spectra for Tc-99m and primary (Tc-99m) were obtained from phantom measurement and scatter-free radiation source measurement. Spectrum for “scatter” was calculated by subtracting “primary (Tc-99m)” from “Tc-99m.” Conventional TEW method and modified TEW method are described in Eqs. 1 and 6, respectively. Amount of estimated scatter was reduced to acceptable level by taking into account fraction of primary count in lower sub-window

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