[Mristudio-users] fiber tracking

Mon Jan 11 12:18:50 EST 2010

as the name suggested: values under "mostly recent ROI" is the results from the ROI you just drew.  the values after "Go Button" are of all ROIs (the combination of ROIs you had drawn).

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From: mristudio-users-bounces at mristudio.org [mristudio-users-bounces at mristudio.org] On Behalf Of susumu mori [susumu at mri.jhu.edu]
Sent: Monday, January 11, 2010 11:56 AM
To: DTI Studio, ROI Editor, Landmarker Questions/Support
Subject: Re: [Mristudio-users] fiber tracking

The statistics in the ROI panel is to measure pixel values inside the ROI. It is just a simple ROI-based quantification.

In the fiber panel, you draw ROI to create tract paths. Then the quantification is based on pixel values of the reconstructed fibers.

On Fri, Jan 8, 2010 at 3:47 PM, Sona Saksena <saksena.sona at gmail.com<mailto:saksena.sona at gmail.com>> wrote:
Hello,

After placing the ROI, the statistics for the mostly recent ROI is shown in the fiber control panel. What is the difference between the statistics after pressing the "Go button" in the "Fiber Statistics" option and the most recent statisitcs in the ROI control panel. What should I take for my final calculations and results.

Please do suggest.

thanks

regards

sona

On Fri, Jan 8, 2010 at 12:53 PM, susumu mori <susumu at mri.jhu.edu<mailto:susumu at mri.jhu.edu>> wrote:
Hi Sona,

There is detailed description about the "flip" function in the manual. the truth is, nobody is sure about the sign because scanners can change it dynamically depending on your scan protocol.
There is a way to rigorously solve this problem, but it is very difficult and that's why we just empirically solve it by checking all 4 options (no check, x, y, z flipped). Good news is, if the signs are wrong, tracking doesn't make sense.

On Fri, Jan 8, 2010 at 10:34 AM, Sona Saksena <saksena.sona at gmail.com<mailto:saksena.sona at gmail.com>> wrote:
Hi,

Thanks for your suggestion. There is a option in the fiber tracking parameters "Flip Eigen Vector". Do I have to use this check box?

Actually we have applied gradients in 26 directions (GE Scanner, 3Tesla). I am not sure about the sign of all of the components in the gradient table.  What shall I do?

This is the gradient table.

0: 0.000000, 0.000000, 0.000000
1: 1.000000, 0.000000, 0.000000
2: 0.849000, 0.528000, 0.000000
3: -0.108000, 0.565000, 0.818000
4: 0.884000, -0.345000, -0.315000
5: -0.003000, -0.736000, 0.677000
6: -0.868000, -0.238000, 0.436000
7: 0.799000, 0.370000, 0.475000
8: -0.162000, 0.987000, 0.000000
9: 0.866000, -0.129000, 0.483000
10: -0.212000, -0.936000, 0.281000
11: 0.068000, -0.892000, -0.446000
12: 0.550000, -0.544000, -0.634000
13: -0.435000, -0.422000, 0.795000
14: -0.599000, 0.780000, 0.182000
15: -0.525000, 0.030000, -0.851000
16: -0.600000, -0.688000, 0.409000
17: 0.653000, -0.060000, -0.755000
18: 0.207000, -0.076000, -0.975000
19: -0.413000, -0.699000, -0.584000
20: -0.436000, 0.822000, -0.366000
21: 0.462000, 0.874000, 0.148000
22: -0.503000, 0.488000, -0.713000
23: 0.824000, -0.530000, 0.202000
24: 0.297000, 0.349000, 0.889000
25: -0.040000, 0.318000, -0.947000

Please do suggest?

regards

sona

On Thu, Jan 7, 2010 at 3:32 PM, susumu mori <susumu at mri.jhu.edu<mailto:susumu at mri.jhu.edu>> wrote:
Hi Sona,

I suggest you to go through the manual section in www.mristudio.org<http://www.mristudio.org/>. There you can find a user's manual for DtiStudio. It gives you the step-by-step procedure for tensor calculation and fiber tracking.

On Thu, Jan 7, 2010 at 2:48 PM, Sona Saksena <saksena.sona at gmail.com<mailto:saksena.sona at gmail.com>> wrote:
Hello,

Please can you tell me steps of performing fiber tracking in brain tumor patients using DTI studio. The DTI data is on 3T GE scanner with gradients applied in 26 directions. How to generate the reconstructed fibres?

thanks

regards

Sona Saksena

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--
Sona Saksena
Ph. D Scholar

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Ph. D Scholar

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