Fig. 7.

Comparison of analysis methods with uniform and tapered contrast vector using ROC. (a) Each subplot shows the ROC curves of recognizing the hemoglobin activity within a single ROI using the two types of contrast vectors (indicated by color) for data with ROI radius = 14 mm from 2000 iterations of simulations under the conditions where the probe registration information (including head size and registration error) is known or not (indicated by column). The two rows indicate oxy-/deoxyhemoglobin, respectively. (b) Each subplot shows the ROC AUC as a function of ROI radius. Every data point represents the AUC calculated from 2000 simulation iterations against the corresponding ROI radius (in mm) used in the simulation.