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Why does PET offer improved image quality compared to SPECT?

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Why does PET offer improved image quality compared to SPECT?

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PET has been shown to yield higher total image counts compared with SPECT 2,3. Moreover, PET provides reduced attenuation artifacts – attributed to higher-energy photons (511KeV), higher total image counts, and superior attenuation correction – to help resolve soft tissue concerns1-3.

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