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. 2018 Aug 7;81(1):670–685. doi: 10.1002/mrm.27371

Table 2.

Initialization times for constructing the preconditioner for different problem sizes.

Problem size 128 × 128 256 × 256 512 × 512 1024 × 1024
Initialization time (s) 0.0395 0.0951 0.3460 1.3371
Additional costs (%) 1.7 0.85 0.52 0.48

Even for very large problem sizes the initialization time does not exceed 2 seconds.

Additional costs are given as percentage of the total reconstruction time without preconditioning.