Table 2.

Comparison of visual and quantitative SPECT interpretations of hypoperfused brain regions.

Brain region	Visual	Quantitative
Frontal lobe	28	30
Temporal lobe	29	30
Parietal lobe	14	21
Occipital lobe	9	9
Cerebellum	18	7

The second column titled “visual” displays the number of patients with evidence of hypoperfusion for each major brain region based on qualitative or visual analysis conducted during group meetings. The third column displays the number of patients with evidence of hypoperfusion based on quantitative analysis using the 3D-SSP software. A hypoperfused region is defined as one containing clusters of pixels with perfusion greater than 2 SD below the normal control perfusion level.