Tract Profiles

[Paula Johnson]

Hi Dr. Yeh,

Thank you for adding the directional information at the bottom of the tract profile window. Unfortunately, I have two issues with it.

1) The directional information does not always appear in the window. I haven't noticed a pattern of when it does and when it doesn't show up,  but it is missing more often than not. 

2) I'm not sure I understand the references and their values. Are they starting points? Do you mind explaining them?

I am using the Windows version of DS Studio downloaded on 5/25/21.

I've attached pictures for reference. (One has the CI showing, but selecting it doesn't seem to make a difference in whether or not the directional information appears.)

Thanks.

Paula Johnson

University of Utah

[Frank Yeh]

Hi Paula,

    Sorry for the unclear labeling, the y-axis is the value for the metrics (e.g. FA, QA...etc.), whereas the x-axis is spatial coordinates or length (e.g. your figures), depending on which reference frame you selected.

    I will modify DSI Studio to provide correct labeling in the future.

Best regards,

Frank

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[Paula Johnson]

Thank you for the prompt reply.

My apologies, but I'm still unclear. Does "Left: #, Posterior: #, Superior: #" at the bottom of the screen mean that point 1 on the x-axis coordinates with the most left, posterior, superior point (and their values e.g. qa on my figure) on the tract? As we move toward point 99 on the x-axis, do the y-values reflect the qa values (in my case) at the most right, anterior, inferior point on the tract? 

What I really just want to get at, is which direction along the tract do the indices on the x-axis represent, e.g. in my figure as we move from 1 to 100 on the x-axis are we moving cortical toward pontine or pontine toward cortical along the WM tract? Or am I totally misunderstanding what the x-axis represents?

Paula

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[Frank Yeh]

The "along-track" profile stretches all tracks into straight lines of
the same length.
The x-axis is the along-track length, but the length value can be
coordinated in two different directions.
Here larger values in the x-axis will choose the direction that goes
toward left-posterior-superior-orientations

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