The image display size is an important parameter. When you trace an anatomic structure, the magnification of the image on which you are tracing will have an effect on the precision with which the digitization is saved--bigger images produce greater precision because the traces are digitized in units of display pixels at the time the trace is created (or most recently modified). Consequently, it is important to choose a particular magnification that is appropriate for a given structure and use it consistently across subjects.
If you magnify an image to a size that is too large to be completely displayed, you can use the scroll bars to move the display area around. Alternatively, you can drag the lower right hand corner of the main window to make the window larger.
Important note:The true magnification is not necessarily exactly equal to the magnification that you specify--the actual magnification is chosen to give a new image size in whole voxels. This means that the magnification of the display's x and y axes may be slightly different from one another. To review the size of the voxels in the main display, press down the "Voxels" menu. The dimensions of the current display (in voxels), the sizes of those voxels, and the field of view (FOV) are shown in the menu
The magnifications of the images in the orthogonal windows are controlled separately
To change the magnification of an orthogonal view window:
Note that making the orthogonal view too large can lead to slow performance when the orthogonal views are updated
Modified: January 18, 2003