Fig. 3
From: 3D printed non-uniform anthropomorphic phantoms for quantitative SPECT
The modulation contrast, \(C_{{\text{M}}}\) (Eq. 3), obtained from SPECT images of spheres for 177Lu (left) and 99mTc (right), as function of the fillable-volume fraction, FVF (Eq. 1), determined by weighing (\(V_{{{\text{grid}},{\text{m}}}}\)). The fitted linear equations are indicated (black solid lines). The pink bands indicate one standard deviation around the fitted line