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  Indian J Med Microbiol
 

Figure 3: Typical energy spectrum of X-rays from X-ray tube. Filtered curve shows effects of filtration (beam hardening), which is used for CT. These data can be applied for attenuation correction of single-photon emitters such as 99mTc using bilinear model shown in Figure 6

Figure 3: Typical energy spectrum of X-rays from X-ray tube. Filtered curve shows effects of filtration (beam hardening), which is used for CT. These data can be applied for attenuation correction of single-photon emitters such as <sup>99m</sup>Tc using bilinear model shown in Figure 6