[Mristudio-users] mouse vs. crosshairs

[susumu mori]

Hi Darren,

I think Hangyi can elaborate this issue better than me, but in my
understanding, this is a very tricky issue.
For the image matrix, the origin of the coordinates are dynamically changed
depending on Axial, Sagittal, Coronal, / A(nterior)->P(osterior), P->A /
Phase-encode - Frequency-encode/etc. On the other hand, on the DtiStudio
display, the brain always have to be upright in the Axial (top right) and
Coronal (bottom right) and "Left is Anterior" in the Sagittal view (bottom
left), no matter what is the image acquisition parameters (matrix
orientation and origin location) are. The reason you find two ways of matrix
representation is; one is the display coordinates (e.g. in the Axial view,
right lower corner is [0, 0]) and the other is the image matrix coordinates.
We can't make them identical.

Susumu

On Sun, Dec 19, 2010 at 4:05 PM, Darren Gitelman <
d-gitelman at northwestern.edu> wrote:

> I've noticed that the location of the mouse in pixels and the location
> of the crosshairs have opposite origins in the x and z directions.
>
> The mouse runs from left (0) to right (max) while the crosshairs run
> in the opposite direction. Similarly the mouse is 0 at the top of the
> image, while the crosshairs are 0 at the bottom. Is there a reason for
> this or could it be fixed?
>
> Thanks,
> Darren
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