[1] [1] M. S. Judenhofer, H. F. Wehrl, D. F. Newport, et al., "Simultaneous PET-MRI: A new approach for functional and morphological imaging," Nat. Med. 14(4), 459-465 (2008).

[2] [2] G. A. Kastis, L. R. Furenlid, D. W. Wilson, et al., "Compact CT/SPECT small-animal imaging system," IEEE Trans. Nucl. Sci. 51, 63-67 (2004).

[3] [3] P. M. Winter, A. M. Morawski, S. D. Caruthers, et al., "Molecular imaging of angiogenesis in earlystage atherosclerosis with αvβ3-integrin-targeted nanoparticles," Circulation 108, 2270-2274 (2003).

[4] [4] N. Deliolanis, T. Lasser, D. Hyde, et al., "Free-space fluorescence molecular tomography utilizing 360° geometry projections," Opt. Lett. 32(4), 382-384 (2007).

[5] [5] M. Autiero, L. Celentano, R. Cozzolino, et al., "Experimental study on in vivo optical and radionuclide imaging in small animals," IEEE Trans. Nucl. Sci. 52(1), 205-209 (2005).

[6] [6] D. L. Prout, R. W. Silverman, A. Chatziioannou, "Detector concept for OPET-A combined PET and optical imaging system," IEEE Trans. Nucl. Sci. 51(3), 752-756 (2004).

[7] [7] J. Peter, D. Unholtz, R. B. Schulz, et al., "Development and initial results of a tomographic dualmodality positron/optical small animal imager," IEEE Trans. Nucl. Sci. 54, 1553-1560 (2007).

[8] [8] S. Liu, B. Zhang, X. Wang, et al., "A dual-modality system for simultaneous FMT and PET tomographic imaging of small animals," IEEE Trans. Nucl. Sci. 58(1), 51-57 (2011).

[9] [9] F. Liu, X. Liu, D. Wang, et al., "A parallel excitation based fluorescence molecular tomography system for whole-body simultaneous imaging of small animals," Ann. Biomed. Eng. 38(11), 3440-3448 (2010).

[10] [10] H. M. Hudson, R. S. Larkin, "Accelerated image reconstruction using ordered subsets of projection data," IEEE Trans. Med. Imag. 13(4), 601-609 (1994).

[11] [11] X. Liu, D. Wang, J. Bai, "Fluorescence molecular tomography with optimal radon transform based surface reconstruction," 31st Annu. Int. Conf. Proc. IEEE Engineering Medical Science, Minnesota, pp. 1404-1407 (2009).

[12] [12] X. Song, D. Wang, J. Bai, "Reconstruction for freespace fluorescence tomography using a novel hybrid adaptive finite element algorithm," Opt. Express 15(26), 18,300-18,317 (2007).

[13] [13] J. Culver, W. Akers, S. Achilefu, "Multimodality molecular imaging with combined optical and SPECT/PET modalities," J. Nucl. Med. 49, 169-172 (2008).

[14] [14] M. L. Schipper, Z. Cheng, S. W. Lee, et al., "MicroPET-based biodistribution of quantum dots in living mice," J. Nucl. Med. 48, 1511-1518 (2007).