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Attenuation correction factor

ACF = 17.81

ACF=eμd,μwater(511 keV)≈0.096 cm−1\mathrm{ACF}=e^{\mu d},\quad \mu_{\mathrm{water}}(511\,\mathrm{keV})\approx 0.096\,\mathrm{cm}^{-1}

PET: ACF = exp(∫ μ ds) along the LOR. SPECT: exp(μ d) for a broad-beam μ.

Laser