MRI studies were obtained on a 1.5 Tesla Siemens camera in a standard orientation (TE=5-7 ms; TR=24ms; a 256×192 matrix; 1 NEX; FOV 30 cm; 124 contiguous slices with 1.2 mm thickness) and were used for coregistration to the SPECT images to provide an anatomical guide for placement of regions of interest.