Table 1.

Execution time of the multiple-seed displacement tracking algorithm, running single-threaded on a 2.4 GHz Intel Core 6600 processor. The simulations were slower since they employed twice as many RF lines and wider windows for displacement estimation. The timings for each pass are divided into tracking (choosing the next point to be processed and maintaining the data structures described in Section 2.4) and displacement estimation (in this case by phase zero search).

Component	Time (ms)
	Simulation	In vivo
Preprocessing (compute baseband analytic signal)	46	16
Seed initialization	0.5	0.5
First pass tracking	5	5
First pass displacement estimation	46	23
Second pass tracking	5	5
Second pass displacement estimation	2	2