How to plot DICOM so that is not elongated?

So I have a GUI where i plot axial coronal and saggital slice of an volume. But my images are oval and elongated. See the screenshot:

http://imageshack.us/photo/my-images/594/problemhj.jpg/

I would like it to be more, let say, normal. In real proportions.

Thanks.

[Tomislav]

Did it.

daspect([1,1,1]);

Cheers.