Fig. 4
In vivo SPECT images of the nude mice bearing C6 xenografted tumors treated with a 131I-Au PENPs-CTX and b 131I-Au PENPs at different time points of 0.5, 2, 4, 6, 8 and 16Â h, respectively, and c their tumor relative signal intensities. d SPECT images of ex vivo tumors at 8Â h postinjection. The white arrow points to the tumor site