[Mristudio-users] Difference in DTI metric values between different versions of DTI studio
susumu mori
susumu at mri.jhu.edu
Sun Sep 19 16:46:33 EDT 2010
you can visually inspect the outlier rejection results (a big red cross in
the inspection window) and see which version is performing better. It also
depends on the threshold value. I believe the newer version performs better.
On Sun, Sep 19, 2010 at 3:48 PM, Rajagopalan, Venkateswaran <
rajagov2 at ccf.org> wrote:
> Thanks very much Dr.Mori, When I unchecked the automatic outlier option (in
> both the versions and reran) the results are the same between the two
> versions, so the difference was contributed by the different automatic
> rejection algorithms.
>
> Thanks again
>
> Venkat
>
> ________________________________
>
> From: mristudio-users-bounces at mristudio.org on behalf of susumu mori
> Sent: Fri 9/17/2010 10:18 PM
> To: DTI Studio, ROI Editor, DiffeoMap Questions/Support; Hangyi Jiang
> Subject: Re: [Mristudio-users] Difference in DTI metric values between
> different versions of DTI studio
>
>
> 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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