Fig. 8

Measured data: a heatmap depicting nWMSE for each kernel combination investigated for GE D710 VPFX 2i reconstruction (minimum at \(h_{PVC}\) = 10.7 × 10.7 × 7.2 mm\(^3\)); b heatmap depicting nWMSE for each kernel combination investigated for GE D710 VPFX 4i24s reconstruction (minimum at \(h_{PVC} = 9.6 \times 9.6 \times 8. 5\,mm^3\)); c horizontal, vertical and axial profiles through the homogeneous post-AFC sphere (top row), the homogeneous pre-AFC sphere (middle row) and a cold Perspex stem (bottom row). The down-sampled GT emission (light blue, dotted), VPFX 2i reconstructed image (red, solid), GT emission smoothed by the \(h_{PVC}\) estimated kernel and down-sampled (royal blue, dashed) are depicted; the extent of the VOI used for kernel determination, in each orientation is shown by the black dash-dotted line