Measured Attenuation Correction

The probability of attenuation for each line of response can be determined by comparing the count rate from an external (transmission) source with the unattenu-ated count rate from the same source when the patient is not in the tomograph, referred to as a blank scan. Transmission measurements are routinely performed in PET to correct for attenuation of the annihilation photons within the body. These measurements can be performed using several different source and detector configurations and these are discussed in the following sections.

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