[Mristudio-users] error when calculating tensor with double gradient table

[Seongjin]

Dear Elizabeth,

What vendor is this table for?

Best,

Seongjin Choi

On Wed, Jul 9, 2008 at 3:39 PM, Elizabeth Finger <
Elizabeth.Finger at lhsc.on.ca> wrote:

> Hello-
>
> I have running into an error- the DTI Mapping program is crashing out, when
> attempting to do a tensor calculation with an updated gradient table from
> the AIR Matrix calcuation that uses two series.  We have two separate series
> with 3 b0 images and 33 graidents with the same DTI parameters per subject.
> We have used AIR to align them together, and generated an updated gradient
> table. When we reload the two AIR series into the DTI Mapping window with
> the new gradient table from AIRMatrix output (table pasted below, now with
> 72 lines, starting w/ 0 and ending w/ 71), the data load correctly. However,
> when we attempt to run the tensor calculation with automatic outlier
> rejection, as soon as the calculation starts the program crashes out.  If we
> use the original gradient table there is no problem. Also, if we use half of
> the updated gradient tables (either first half w/ numbers from 0 to 35, or
> the second half w/ original airmatrix numbers from 36-71, the tensor
> calculation works. Is there something else we can do to use the revised
> gradient table for both series and include both series in the tensor
> calculation?
>
> Thank you,
> Elizabeth Finger
>
> ***   New Gradient Table   ***
>  0: 0.000000, 0.000000, 0.000000
>  1: 0.000000, 0.000000, 0.000000
>  2: 0.000000, 0.000000, 0.000000
>  3: 0.999999, 0.000434, -0.000390
>  4: 0.313706, 0.949767, -0.000230
>  5: -0.072833, 0.636259, 0.767252
>  6: 0.875411, -0.479757, 0.061399
>  7: -0.199675, -0.555806, 0.809540
>  8: -0.615266, -0.363411, 0.700719
>  9: 0.684460, 0.371145, 0.627016
> 10: -0.565897, 0.821968, 0.063204
> 11: 0.901326, 0.406546, 0.148179
> 12: 0.093208, -0.995034, -0.035177
> 13: 0.144608, -0.895242, -0.421890
> 14: 0.524194, -0.680821, -0.509454
> 15: -0.481128, -0.733741, 0.480656
> 16: -0.823076, 0.449965, 0.347979
> 17: -0.888253, -0.063133, -0.455690
> 18: -0.672102, -0.732741, 0.110781
> 19: 0.699453, -0.110723, -0.705987
> 20: 0.441389, -0.391523, -0.806244
> 21: -0.281831, -0.814184, -0.507885
> 22: -0.601632, -0.812283, -0.508305
> 23: 0.629421, 0.708171, 0.317496
> 24: -0.568210, 0.273148, -0.778529
> 25: 0.829784, -0.324714, 0.454091
> 26: 0.313490, 0.491775, 0.811144
> 27: 0.054139, -0.216170, -0.975053
> 28: 0.286972, -0.904461, 0.315101
> 29: 0.923529, -0.021970, -0.383806
> 30: 0.264165, -0.607207, 0.749858
> 31: 0.260233, -0.609104, 0.749834
> 32: 0.854475, 0.400779, -0.330854
> 33: -0.097884, 0.220989, -0.970907
> 34: -0.349784, -0.104215, 0.931861
> 35: -0.426056, -0.091100, -0.900897
> 36: 0.000000, 0.000000, 0.000000
> 37: 0.000000, 0.000000, 0.000000
> 38: 0.000000, 0.000000, 0.000000
> 39: 0.999991, -0.004224, -0.000249
> 40: 0.314415, 0.949532, -0.000519
> 41: -0.075562, 0.638964, 0.766869
> 42: 0.875203, -0.479650, 0.061976
> 43: -0.199274, -0.552859, 0.809863
> 44: -0.614361, -0.360801, 0.701046
> 45: 0.685615, 0.369276, 0.626992
> 46: -0.559605, 0.826597, 0.062539
> 47: 0.904448, 0.399873, 0.148048
> 48: 0.093181, -0.995075, -0.035007
> 49: 0.144334, -0.895057, -0.421964
> 50: 0.519135, -0.685870, -0.509212
> 51: -0.481587, -0.732226, 0.480938
> 52: -0.823207, 0.450559, 0.347815
> 53: -0.886639, -0.063294, -0.456166
> 54: -0.676109, -0.728467, 0.111361
> 55: 0.700883, -0.109309, -0.705804
> 56: 0.444573, -0.392454, -0.805908
> 57: -0.280834, -0.812282, -0.508434
> 58: -0.601365, -0.814664, -0.507772
> 59: 0.629210, 0.711182, 0.316532
> 60: -0.566986, 0.272640, -0.778692
> 61: 0.830525, -0.326559, 0.453683
> 62: 0.315200, 0.490945, 0.811119
> 63: 0.054672, -0.213494, -0.975138
> 64: 0.284283, -0.905688, 0.314935
> 65: 0.923751, -0.020852, -0.383734
> 66: 0.259252, -0.608233, 0.749993
> 67: 0.259508, -0.605161, 0.750359
> 68: 0.854059, 0.401502, -0.330884
> 69: -0.095633, 0.224934, -0.970803
> 70: -0.349293, -0.104589, 0.931882
> 71: -0.423139, -0.088227, -0.901151
>
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