3D Analysis
Click-once the  "3D View" tab.

Isosurfaces:
The first isosurface (surface of constant intensity / CBF value) displayed is the outer brain isosurface.

gCBF:
To select another (set of) isosurface(s), enter an intensity / CBF value between the maximum and minimum values shown on the colour bar, into the gCBF (global Cerebral Blood Flow) box, then press once the Enter button on your keyboard.

Two isosurfaces will now be displayed:

• the outer isosurface;
• the isosurface at the selected gCBF value.

Transparency:
To change the transparency of the outer brain isosurface, click and hold the pointer in the Transparency box.

Sliding the pointer in the - direction makes the outer surface more transparent, while sliding the pointer in the + direction makes it more opaque.

Talairach Slice Planes:
To cut the isosurfaces with a 2D Talairach plane, first select the   type of slice by clicking once on the plane type of interest in the "Grid Type" box.

Then select the slice of interest in the "Grid Selector".

Multiple slices with different views are possible.

To remove all slices, click-once "Select None" at the bottom of the box.

Talairach Atlas Grids:
As in the 2D viewers, either the standard or adaptive Talairach grid can be superimposed over any set of slices by clicking once on the Standard or Adaptive button in the "Talairach Grid" box.

To remove the displayed grids click-once the Grid Off button.

The 3D viewer displays the following quantitative intensity / gCBF information.

• Isosurface: the intensity / gCBF value at which the isosurface(s) were generated.
• PSA: the total surface area of all the isosurfaces at the selected intensity.
• PSEV: the total volume enclosed by all the generated isosurfaces.
• PSIV: the total integrated dose enclosed the by generated isosurfaces.
• PSR(1): the ratio of the total surface area to the total enclosed volume.
• PSR(3/2): the ratio of the total surface area to the 3/2 power to the total enclosed volume. This is a dimensionless number.

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