An Improved Extrapolation Scheme for Truncated CT Data Using 2D Fourier-Based Helgason-Ludwig Consistency Conditions

Table 1

Summary of quantitative evaluation of truncation correction methods for medium truncation (ROI: radius of 95 pixels) and severe truncation (ROI: radius of 60 pixels).

	Algorithms	Head scan 1		Head scan 2
		Medium	Severe	Medium	Severe
RMSE	Water cylinder extrapolation	123.0	271.6	29.7	114.2
	Proposed method	20.1	43.4	29.3	53.3
CC	Water cylinder extrapolation	0.987	0.985	0.996	0.984
	Proposed method	0.996	0.995	0.997	0.990