Region-Based Partial Volume Correction Techniques for PET Imaging: Sinogram Implementation and Robustness
Figure 6
Noise propagation characteristics of four PVC methods expressed in terms of noise magnification factors (NMF) for the simulated sphere phantom (a), simulated brain phantom (b), and the physical sphere phantom (c). The ideal values for NMF are shown as green lines. The NMF values are smaller for sGTM and sGTMo compared to those of GTM and GTMo methods specially for smaller objects. NMF: noise magnification factor, GTM: geometric transfer matrix, sGTM: symmetric GTM, GTMo: GTM implemented in sinogram-space, sGTMo: sGTM implemented in sinogram-space, VOI: volume of interest, puta: putamen, caud: caudate nucleus, gry: grey matter, and wht: white matter.
