Fig. 1. Schematic of the measurement system.

Fig. 2. Reconstruction results of (a) and (b) Expt. 1 and (c) and (d) Expt. 2. (a) and (c) denote the inverse lifetime maps obtained by the EPFLT method, while (b) and (d) denote those obtained by the DFLT method. The red and green circles denote the phantom border and the position of fluorescence targets, respectively.

Fig. 3. Reconstruction results of (a) and (b) Expt. 3 and (c) and (d) Expt. 4. (a) and (c) denote the inverse lifetime maps obtained by the EPFLT method, while (b) and (d) denote those obtained by the DFLT method. The red and green circles denote the phantom border and the position of fluorescence targets, respectively.

Fig. 4. Profiles along the dashed-dotted lines in Figs. 2 and 3 for (a) Expt. 1, (b) Expt. 2, (c) Expt. 3, and (d) Expt. 4. The red lines denote the real inverse lifetime profiles, while the blue and green lines denote the inverse lifetime results obtained by the EPFLT and DFLT methods, respectively.