Fig. 2From: Fast quantitative reconstruction with focusing collimators for liver SPECTFrom top to bottom are the coronal, sagittal, and transverse planes of the XCAT phantom (drawn are the body, liver, and lung contours) for the simulated collimators. The color gives an indication of the geometric sensitivity of each collimator. The detector surface follows a closed (non-circular) contour of the patient while rotating around the center of the liverBack to article page