After loading a DICOM volume the slice offsets in the 2D viewers are set correctly to the middle of a slice. However, after clicking on the 'Adjust the slice viewer's field of view...' icon in the slice viewer changes the slice offset to an incorrect value: just between two slices.

This is an issue, because if we are at the boundary between two slices then the labelmap is quite often shown for the wrong slice (and the mismatch is very visible).

How to reproduce:

• Load MRHead sample
• Slicer offset in the red viewer is -10.214mm (correct), turn off interpolation and zoom in on the yellow slice viewer to confirm that the red slice really goes through the middle of the voxel. By enabling Slicer intersection.
• 'Click on the "Adjust the slice viewer's field of view."' icon
• The offset in the red viewer is changed to -10.714mm (incorrect), in the zoomed in yellow slice viewer the red slice is now at the boundary of two slices

After loading a DICOM volume the slice offsets in the 2D viewers are set correctly to the middle of a slice. However, after clicking on the 'Adjust the slice viewer's field of view...' icon in the slice viewer changes the slice offset to an incorrect value: just between two slices.

This is an issue, because if we are at the boundary between two slices then the labelmap is quite often shown for the wrong slice (and the mismatch is very visible).

How to reproduce:

• Load MRHead sample
• Slicer offset in the red viewer is -10.214mm (correct), turn off interpolation and zoom in on the yellow slice viewer to confirm that the red slice really goes through the middle of the voxel
• 'Click on the adjust...' icon
• The offset in the red viewer is changed to -10.714mm (incorrect), in the zoomed in yellow slice viewer the red slice is now at the boundary of two slices