[Mristudio-users] Fwd: fiber tracking

[Sona Saksena]

---------- Forwarded message ----------
From: Sona Saksena <saksena.sona at gmail.com>
Date: Fri, Jan 8, 2010 at 3:47 PM
Subject: Re: [Mristudio-users] fiber tracking
To: "DTI Studio, ROI Editor, Landmarker Questions/Support" <
mristudio-users at mristudio.org>


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> 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>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> wrote:
>>
>>> Hi Sona,
>>>
>>> I suggest you to go through the manual section in 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>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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>>>
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>>
>>
>> --
>> Sona Saksena
>> Ph. D Scholar
>>
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>
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-- 
Sona Saksena
Ph. D Scholar



-- 
Sona Saksena
Ph. D Scholar
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