[Mristudio-users] Difference in DTI metric values between different versions of DTI studio

[susumu mori]

Thank you for letting us know this.
If you just subtract the two FA maps (or RA maps) by using RoiEditor
(without tracking), do you get significant difference? The algorithms of
automated rejection are not same between the two versions. If your data has
some motion problems and many slices were rejected, it is possible that two
different algorithms rejected the different number of slices. You can check
which slices were rejected.

I would recommend you to use the regular tensor calculation without slice
rejection and make sure the results are the same. If so, the difference
should come from the rejection scheme.

On Fri, Sep 17, 2010 at 6:30 PM, Rajagopalan, Venkateswaran <
rajagov2 at ccf.org> wrote:

>  Dear All,
>
> I am surpirsed to find that DTI metrics (for instance RA metric) between
> DTIstudio_3.0_ beta version and DTIstudio_latest which i downloaded recently
> were very much different.
>
> Same options were used like automatic outlier rejection of images >3% also
> the same CST ROI was superimposed in both the DTI studio beta version and
> in DTIstudio latest
>
>
> RA values along CST using DTIstudio_3.0_ beta version
>
>     Slice  #_Of_Fibers   Max_Val   Min_Val  Mean_Val   Std_Dev
>     9:     1        0.50        0.50        0.50        0.00       1      1
>      1        1.00        0.00
>    10:    61        0.79        0.43        0.69        0.10      10     23
>      1        7.60        7.41
>    11:    60        0.85        0.18        0.74        0.14      13     25
>      1       10.62        8.91
>    12:    61        0.89        0.34        0.76        0.13      12     30
>      1       11.42        9.25
>    13:    61        0.95        0.27        0.75        0.15      11     28
>      1       12.64        9.83
>    14:    61        0.74        0.39        0.59        0.10       9     39
>      1       15.22       12.58
>    15:    61        0.74        0.32        0.57        0.10      10     45
>      1       14.40       14.19
>    16:    60        0.72        0.32        0.56        0.08       9     35
>      1       11.00       11.85
>    17:    61        0.68        0.47        0.61        0.06       8     37
>      2       16.13       12.19
>    18:    60        0.64        0.57        0.63        0.02       9     39
>      1       12.22       12.44
>    19:    61        0.61        0.52        0.59        0.02       9     37
>      1       15.11       10.87
>    20:    60        0.45        0.34        0.41        0.03      12     36
>      1       13.50       11.56
>    21:    61        0.37        0.20        0.30        0.04      16     42
>      1       12.94       13.91
>    22:    60        0.35        0.19        0.28        0.03
>
> RA values along CST using DTIstudio_latest
>
>    Slice  #_Of_Fibers   Max_Val   Min_Val  Mean_Val   Std_Dev
>
>     9:     1        0.97        0.97        0.97        0.00       1      1
>      1        1.00        0.00
>    10:    61        1.04        0.47        0.90        0.19      10     23
>      1        7.60        7.41
>    11:    60        1.16        0.11        0.93        0.19      13     25
>      1       10.62        8.91
>    12:    61        1.05        0.42        0.89        0.14      12     30
>      1       11.42        9.25
>    13:    61        1.13        0.25        0.87        0.14      11     28
>      1       12.64        9.83
>    14:    61        0.89        0.48        0.70        0.10       9     39
>      1       15.22       12.58
>    15:    61        0.87        0.27        0.65        0.13      10     45
>      1       14.40       14.19
>    16:    60        0.79        0.27        0.62        0.10       9     35
>      1       11.00       11.85
>    17:    61        0.80        0.47        0.68        0.10       8     37
>      2       16.13       12.19
>    18:    60        0.75        0.58        0.64        0.05       9     39
>      1       12.22       12.44
>    19:    61        0.70        0.53        0.65        0.04       9     37
>      1       15.11       10.87
>    20:    60        0.52        0.36        0.46        0.05      12     36
>      1       13.50       11.56
>    21:    61        0.43        0.21        0.32        0.04      16     42
>      1       12.94       13.91
>    22:    60        0.40        0.19        0.28        0.04
>
> What am i doing wrong here. Same DTI data was used in both the versions and
> the processing steps were identical.
>
> Thanks
>
> Venkat
>
>
>
>
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