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. Author manuscript; available in PMC: 2011 Mar 6.
Published in final edited form as: Semin Nucl Med. 2008 May;38(3):177–198. doi: 10.1053/j.semnuclmed.2008.01.001

Figure 5.

Figure 5

Calibration of CT for x-ray derived attenuation coefficients performed with cylindrical phantom (left) containing different tissue equivalent materials. CT values (ie Hounsfield units) are correlated with values of linear attenuation coefficients (ie cm‐1) calculated from known composition of tissue equivalent materials calculated at energy of radionuclide used for emission imaging. Calibration curve (right) used to convert values in CT image to form patient-specific map of attenuation coefficients for attenuation correction of emission image (Reproduced with permission from reference [21]).