[Mristudio-users] Error #_of_Images != (#_of_gradients) x (#_of_repetitions)

[susumu mori]

Hi Kevin,

1) First, load the images using Mri3DView. It should load all images,
which are listed in the pull-down menu.
2) Check the number of 3D images and also the image dimensions. Make
sure that all 3D images look fine. For example, if you did the
12-orientation Siemens DTI, you should find 13 3D volumes.
3) Then load the same data by DtiMapping. In the initial data input
window, the number of gradient orientations need to match what you saw
in Mri3DView.
4) In the initial data input window, there is also a section to
specify if all slices need to be read. Here you need to say "all
slices"

susumu

On Tue, Apr 19, 2011 at 5:42 PM, Kevin Spitler <kevinspitler at ucla.edu> wrote:
> Hello,
>
> I have several Siemens datasets with the Error that the number of
> Images does not equal the product of the number of gradients and
> repetitions.
>
> What is the recommended way to debug this problem?  Is this a problem
> with the gradient that I am using?
>
> My gradient is:
> 0: 0.000, 0.000, 0.000
>  1: 0.500, 0.000, 0.500
>  2: -0.500, 0.000, 0.500
>  3: 0.000, 0.500, 0.500
>  4: 0.000, 0.500, -0.500
>  5: 0.500, 0.500, 0.000
>  6: -0.500, 0.500, 0.000
>  7: 1.000, 0.000, 1.000
>  8: -1.000, 0.000, 1.000
>  9: 0.000, 1.000, 1.000
>  10: 0.000, 1.000, -1.000
>  11: 1.000, 1.000, 0.000
>  12: -1.000, 1.000, 0.000
>
> After I click "OK" on the error message, DTI Studio does not crash.
> Typically, only a portion of the brain is displayed (e.g., the
> inferior portion).
>
> B values used are 0,600,1200.  I have tried the following gradient
> with similar results:
>  0: 0.000, 0.000, 0.000,600
>  1: 0.500, 0.000, 0.500,600
>  2: -0.500, 0.000, 0.500,600
>  3: 0.000, 0.500, 0.500,600
>  4: 0.000, 0.500, -0.500,600
>  5: 0.500, 0.500, 0.000,600
>  6: -0.500, 0.500, 0.000,600
>  7: 1.000, 0.000, 1.000,600
>  8: -1.000, 0.000, 1.000,600
>  9: 0.000, 1.000, 1.000,600
>  10: 0.000, 1.000, -1.000,600
>  11: 1.000, 1.000, 0.000,600
>  12: -1.000, 1.000, 0.000,600
> 13: 0.500, 0.000, 0.500,1200
> 14: -0.500, 0.000, 0.500,1200
> 15: 0.000, 0.500, 0.500,1200
> 16: 0.000, 0.500, -0.500,1200
> 17: 0.500, 0.500, 0.000,1200
> 18: -0.500, 0.500, 0.000,1200
> 19: 1.000, 0.000, 1.000,1200
> 20: -1.000, 0.000, 1.000,1200
> 21: 0.000, 1.000, 1.000,1200
> 22: 0.000, 1.000, -1.000,1200
> 23: 1.000, 1.000, 0.000,1200
> 24: -1.000, 1.000, 0.000,1200
>
> The error message then has the number of gradients =25, with the same
> number of repetitions and images.
>
> Thank you for helping me use these datasets.
>
> Best,
> Kevin
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