[Insight-users] Re: registration non-convergence

[Carolyn Johnston]

Hi Luis and everyone,

I'm appending the entire output from the run I posted snippets of on Friday.

Here are the parameters I used:

maxSteplength: .0000556
minStepLength: .000001

The pixel spacing is: .000278 physical units so you can see I drove the 
initial steplength way
down to try to stabilize the registration's behavior.
It may well be that there is something I am misunderstanding about the 
steplengths.

Oh... finally, the optimizer is regular step gradient descent, the metric 
is meansquares.
The stepsize doesn't seem to be dropping near the metric minimum as it 
ought to.

:) Carolyn

Performing registration

0 = 2185.867696: [0.000052, -0.000019]

1 = 2123.551007: [0.000104, -0.000039]

2 = 2072.931500: [0.000156, -0.000058]

3 = 2033.078306: [0.000209, -0.000077]

4 = 2003.966331: [0.000261, -0.000097]

5 = 1985.579199: [0.000313, -0.000116]

6 = 1940.038059: [0.000365, -0.000135]

7 = 1886.751889: [0.000417, -0.000155]

8 = 1844.197187: [0.000469, -0.000174]

9 = 1812.368526: [0.000521, -0.000194]

10 = 1791.268519: [0.000573, -0.000213]

11 = 1761.702440: [0.000625, -0.000232]

12 = 1705.768898: [0.000677, -0.000252]

13 = 1660.557738: [0.000730, -0.000271]

14 = 1626.082405: [0.000782, -0.000291]

15 = 1600.292140: [0.000834, -0.000310]

16 = 1584.974016: [0.000886, -0.000330]

17 = 1524.506984: [0.000938, -0.000350]

18 = 1474.785515: [0.000990, -0.000369]

19 = 1435.782025: [0.001042, -0.000389]

20 = 1407.476743: [0.001094, -0.000408]

21 = 1389.858740: [0.001146, -0.000428]

22 = 1345.473747: [0.001198, -0.000448]

23 = 1293.201855: [0.001250, -0.000467]

24 = 1251.620955: [0.001302, -0.000487]

25 = 1220.730861: [0.001354, -0.000507]

26 = 1200.539247: [0.001406, -0.000527]

27 = 1172.836523: [0.001458, -0.000546]

28 = 1118.024880: [0.001510, -0.000566]

29 = 1072.199823: [0.001562, -0.000586]

30 = 1036.818545: [0.001614, -0.000606]

31 = 1012.107587: [0.001665, -0.000626]

32 = 998.041786: [0.001717, -0.000646]

33 = 940.142559: [0.001769, -0.000666]

34 = 891.596111: [0.001821, -0.000686]

35 = 853.707596: [0.001873, -0.000706]

36 = 826.461752: [0.001925, -0.000726]

37 = 809.853284: [0.001977, -0.000746]

38 = 769.417401: [0.002028, -0.000767]

39 = 718.475480: [0.002080, -0.000787]

40 = 678.167964: [0.002132, -0.000807]

41 = 648.498841: [0.002184, -0.000827]

42 = 629.480009: [0.002235, -0.000848]

43 = 618.212452: [0.002287, -0.000868]

44 = 608.816764: [0.002339, -0.000889]

45 = 600.163617: [0.002391, -0.000909]

46 = 592.226347: [0.002442, -0.000929]

47 = 584.986726: [0.002494, -0.000950]

48 = 578.437412: [0.002546, -0.000970]

49 = 570.860870: [0.002598, -0.000990]

50 = 563.768378: [0.002649, -0.001010]

51 = 557.379971: [0.002701, -0.001030]

52 = 551.697664: [0.002753, -0.001051]

53 = 546.735104: [0.002805, -0.001071]

54 = 541.458457: [0.002857, -0.001091]

55 = 535.937062: [0.002909, -0.001111]

56 = 531.134793: [0.002960, -0.001131]

57 = 524.740108: [0.003012, -0.001151]

58 = 519.468721: [0.003064, -0.001171]

59 = 514.583317: [0.003116, -0.001191]

60 = 508.796624: [0.003168, -0.001211]

61 = 503.762458: [0.003220, -0.001231]

62 = 499.465205: [0.003272, -0.001251]

63 = 495.897303: [0.003324, -0.001271]

64 = 493.062647: [0.003375, -0.001291]

65 = 489.398615: [0.003427, -0.001311]

66 = 486.106820: [0.003479, -0.001331]

67 = 483.553898: [0.003531, -0.001351]

68 = 481.752750: [0.003583, -0.001371]

69 = 480.726231: [0.003635, -0.001390]

70 = 479.064837: [0.003687, -0.001410]

71 = 475.634403: [0.003739, -0.001430]

72 = 473.007571: [0.003791, -0.001450]

73 = 471.157552: [0.003843, -0.001470]

74 = 470.065493: [0.003895, -0.001490]

75 = 469.494684: [0.003947, -0.001510]

76 = 467.887291: [0.003999, -0.001529]

77 = 467.045557: [0.004051, -0.001549]

78 = 466.963944: [0.004103, -0.001569]

79 = 467.642714: [0.004154, -0.001589]

80 = 469.093127: [0.004206, -0.001609]

81 = 469.692840: [0.004258, -0.001628]

82 = 470.546900: [0.004310, -0.001648]

83 = 472.165704: [0.004362, -0.001668]

84 = 474.223090: [0.004414, -0.001688]

85 = 475.723018: [0.004466, -0.001707]

86 = 477.035058: [0.004518, -0.001727]

87 = 477.830104: [0.004570, -0.001747]

88 = 479.414878: [0.004622, -0.001767]

89 = 481.771161: [0.004674, -0.001786]

90 = 484.888701: [0.004726, -0.001806]

91 = 488.597884: [0.004778, -0.001826]

92 = 490.988388: [0.004830, -0.001846]

93 = 494.134218: [0.004882, -0.001865]

94 = 498.037073: [0.004934, -0.001885]

95 = 502.706704: [0.004986, -0.001905]

96 = 508.162350: [0.005038, -0.001925]

97 = 512.621524: [0.005090, -0.001944]

98 = 517.175693: [0.005142, -0.001964]

99 = 520.728025: [0.005194, -0.001984]