Table 2. Mean runtimes for registration of images from the 5 datasets of the original FLIRT and the accelerated FLIRT with Workstation 1.

(Time: seconds).

Dataset time (s)	1	2	3	4	5
Dimensions (Width*Height*Depth)	131×179×137	162×215×157	176×192×192	256×124×256	256×256×128
Size of voxels	3212513	5468310	6488064	8126464	8088608
Original FLIRT	46.9	63.74	75.66	95.51	118.29
Accelerated FLIRT	13.72	23.17	25.05	25.54	24.56
Total speedup	3.4	2.8	3	3.7	4.8