FIG 1. Methods of rCBF assessment.

Top, 3D images were made by reconstructing the transaxial SPECT data.

Middle, The surface threshold value was set at 30 mL/100 g/min, and the image defects, which indicate the region with rCBF less than 30 mL/100 g/min, were outlined and calculated by using the image-analysis system (arrows).

Bottom, Transaxial images were obtained with the IMP-ARG method. ROIs of 30 x 15 mm were set in the lesion with decreased CBF along the cerebral cortex (arrows), and its value was measured.