Figure 5

Default display of an MRI stored as signed short. All transverse slices are displayed by default with the full possible short (16-bit) data range mapped to a 256 grey level color map. The maximum value of 32,767 maps to white and the minimum value -32,768 maps to black. Zero maps to the mid grey value which is why the background areas on the slices are grey not black. The MRI actually contained no values less than zero and contrast could be improved by scaling to show positive values only with zero mapped to black as in Fig. 6. By default there are six columns and only 24 of 255 transverse slices fit on the computer display, the rest could be scrolled to for display.