Table 2.

T2 estimates (mean ± standard deviation) obtained with REPCOM for three circular objects with various numbers of TE points and total number of k-space lines. The data were obtained using a numerical phantom. The diameter of the objects is 6 pixels, the T2’s are (a) 230 ms, (b) 150 ms and (c) 80 ms. These objects were embedded into a 112-pixel diameter circular background. For the various numbers of TE, the same TE coverage was enforced. TE points are equally spaced. Complex Gaussian noise was added to the k-space such that the SNRat TE = 60 ms is about 25 for the object with T2 = 80 ms.

	# lines	128	256	512	1024
T2 truth = 230 ms	ETL = 4	238.14 ± 8.12	234.14 ± 5.39	231.72 ± 3.98	234.04 ± 2.55
	ETL = 8	237.80 ± 7.10	233.90 ± 5.30	231.82 ± 4.24	232.15 ± 3.62
	ETL = 16	233.64 ± 7.04	233.85 ± 5.13	233.76 ± 3.44	232.64 ± 2.99
T2 truth = 150 ms	ETL = 4	154.63 ± 3.35	151.70 ± 2.71	152.27 ± 1.93	150.89 ± 1.38
	ETL = 8	154.45 ± 3.76	151.44 ± 2.81	151.70 ± 1.67	150.11 ± 1.66
	ETL = 16	152.62 ± 3.27	151.52 ± 2.30	152.45 ± 1.73	150.37 ± 1.85
T2 truth = 80 ms	ETL = 4	81.25 ± 2.50	80.57 ± 1.79	80.27 ± 1.25	80.27 ± 0.88
	ETL = 8	81.18 ± 2.01	80.30 ± 1.43	80.37 ± 0.88	80.15 ± 0.69
	ETL = 16	80.87 ± 1.68	80.35 ± 1.17	80.64 ± 0.78	80.28 ± 0.68