Table 1.

Summary metrics of RMSE (×10⁻²; units of μ, cm⁻¹) computed over the entire breast volume with the full-fan reconstruction as the reference standard (SD – standard deviation; Min – Minimum; Q1 – 1^st quartile; Q3 – 3^rd Quartile; Max – Maximum). Δθ of 0.25°, 1.49° and 2.72° correspond to half-overlap region [0,u₀] of 10, 60 and 110 pixels of 0.388 mm, respectively. RMSE reduces with increasing Δθ and the summary metrics are similar among the three weighting schemes at each Δθ.

Δθ	Weight	Mean	SD	Min	Q1	Median	Q3	Max
0.25°	Cho	0.836	0.367	0.364	0.580	0.878	1.014	1.729
	Schafer	0.836	0.367	0.364	0.580	0.878	1.014	1.729
	Wang	0.836	0.367	0.364	0.580	0.878	1.014	1.729
1.49°	Cho	0.476	0.205	0.226	0.307	0.434	0.608	0.877
	Schafer	0.476	0.205	0.226	0.307	0.434	0.608	0.877
	Wang	0.476	0.205	0.226	0.307	0.434	0.608	0.877
2.72°	Cho	0.439	0.198	0.201	0.270	0.401	0.575	0.794
	Schafer	0.439	0.198	0.201	0.270	0.401	0.575	0.794
	Wang	0.439	0.198	0.201	0.270	0.401	0.575	0.794