Table 3.

Comparison of arithmetic operations of semi-dynamic PAPA and the nested EM-TV for the test data. The number · represents · × 2²⁰ arithmetic operations required.

	tol	10−1	10−2	10−3	10−4	10−5	10−6	10−7
Alg.
			low-noise phantom
PAPA		3380	9464	29744	83148	207532	400192	1080924
Nested EM-TV		3795	10626	32637	88803	233013	589743	1653861
			high-noise phantom
PAPA		3380	9464	28392	79092	195364	392080	1176916
Nested EM-TV		3795	10626	31878	84249	220869	559383	1552155