[Mristudio-users] Difference in DTI metric values between different versions of DTI studio
Rajagopalan, Venkateswaran
rajagov2 at ccf.org
Sun Sep 19 17:10:58 EDT 2010
Thanks very much.
Venkateswaran
________________________________
From: mristudio-users-bounces at mristudio.org on behalf of susumu mori
Sent: Sun 9/19/2010 4:46 PM
To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
Subject: Re: [Mristudio-users] Difference in DTI metric values between different versions of DTI studio
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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