Prospects on Time-Domain Diffuse Optical Tomography Based on Time-Correlated Single Photon Counting for Small Animal Imaging

Figure 15

Photograph of the scanner where SPADs replace PMTs in the fluorescence arms of the detection channels (a). Schematic of the fluorescence arm of a detection channel modified for a SPAD detector (b). Essentially, a 50 mm focal length lens has been replaced by a much smaller focal length lens of 4.6 mm, and the lens tube was made longer.

(a)

(b)