Table 1.

NPS average percent error for different ROI number, ROI size, and background removal method. No window functions were applied for this data.

NPS Calculation Error (%)
Averaged ROI Number	ROI Size (pixels)	Background Removal Methods
		Image Subtraction	PCA	RSS 1st Order	RSS 2nd Order
50	128	0.98	0.85	0.81	0.85
	96	1.32	1.16	1.11	1.15
	64	2.02	1.80	1.71	1.89
	48	2.69	2.30	2.24	3.58
	32	3.98	8.52	3.49	6.05
300	128	0.42	0.39	0.38	0.40
	96	0.54	0.58	0.51	0.59
	64	0.83	0.92	0.81	1.01
	48	1.07	1.18	1.16	2.59
	32	1.64	7.11	1.85	4.73