Hybrid Modality Fusion of Planar Scintigrams and CT Topograms to Localize Sentinel Lymph Nodes in Breast Lymphoscintigraphy: Technical Description and Phantom Studies
Figure 5
Accuracy of lateral distortion compensation algorithm for planar scintigram-CT topogram registration. Fused images of the original (uncompensated) scintigram and CT topogram of three button sources (a), and stretched (compensated) scintigram and CT topogram (b). The vertical shift in the original fused images is due to a registration offset in the table travel direction of the scanner equal to the distance between the edge of the field of view of the gamma camera detector and the edge of the image matrix. This offset is accounted for in the compensation algorithm so the scintigram and topogram accurately register in the longitudinal direction of the scanner. On the right, the scintigram is compensated to correct the lateral position of the right-most button source. The residual error in lateral position of a given button source after compensation was within ±3.44 mm.
