FIGURE 3. Fusion of ¹²³I-ß-carbomethoxyiodophenyl tropane SPECT neuroreceptor images with MRI. MR images can be used to provide anatomic region of interest for basal ganglia, thus avoiding quantification errors resulting from blurred SPECT boundaries. Such anatomic information also potentially can be used for partial volume correction. Images courtesy of Henryk Barthel, MD, Leipzig University, Germany.