[Mristudio-users] Theory Image Tool

[hanaie]

Dear  Dr  Mori,

 

Thank you for your kindness, detailed explanation.

 

I did in a way you`ve shown.

I checked “standard linear fitting” and the two checkboxes.

But I got row of error image with mostly blank(the bottom row image).

Not after “outliner pixel rejection”.

 

Is this something wrong and could you tell me why this occur ?

 

 

Sorry, I am fairly a beginner and poor in English.

 

Thanks .

 

Ryuzo

 

 

From: mristudio-users-bounces at mristudio.org [mailto:mristudio-users-bounces at mristudio.org] On Behalf Of susumu mori
Sent: Sunday, October 31, 2010 8:40 PM
To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
Subject: Re: [Mristudio-users] Theory Image Tool

 

It depends on how you use this tool. For example, after you start tensor calculation, you get an initial "DTI Map Option" window, in which you can find two checkboxes at the lower left corner saying "create ,,,,,". If you proceed to "standard linear fitting", then you should get one row of theory image and another row of error (subtracted) images.

 

In this window, if you choose to use "pixel rejection", instead of "standard linear fitting", you get 3 options in "Verify the results" section. Here we recommend to use "binary mask" instead of "error map". If you choose "binary mask", the bottom row is not error maps, but showing which pixels were rejected due to large errors. 

 

If you case, I suspect your images did not contain obvious outliers and therefore the bottom row images are mostly blank.

2010/10/31 hanaie <dc02hana at m6.gyao.ne.jp>

Hi,

 

To evaluate the quality of DTI data, I used “theory Image Tool”.

Because I have only 1 data set.

After using “theory Image Tool” , I checked images. But these image looks like strange.

Issue is third row.

 

In these images, first row is scan#1 and second row is theory image ,third row is Δ(theory,scan#1).

In my image , third row looks like almost black with a little bit white point.

 

I read the paper titled “How should we evaluate the quality of our DTI data?”

In that paper, third row looks like grey.

 

Why does my image looks like almost black?

Is wrong gradient table responsibility for it?

 

 

エラー! ファイル名が指定されていません。

 

 

Thanks,

 

Ryuzo

 

 

 


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