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Collimator geometric resolution

L_eff = 34.20 mm

Rg=d (Leff+b)/Leff,Leff=L−2/μR_g = d\,(L_{\mathrm{eff}}+b)/L_{\mathrm{eff}},\quad L_{\mathrm{eff}}=L-2/\mu

R_g ≈ d (L_eff + b) / L_eff for a parallel-hole collimator.

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