Fig. 1. Different imaging technologies for studying acupuncture therapy and their application scope

Fig. 2. Continuous display of gastric laser Doppler blood perfusion images of rats during electroacupuncture (EA)^[30]. (a) Before EA stimulation; (b) instant of EA stimulation; (c) EA stimulation for 5 min; (d) EA stimulation for 10 min; (e) 5 min after ceasing EA stimulation; (f) 10 min after ceasing EA stimulation

Fig. 3. Comparison of peak values of group average hemodynamic response between CG and IG for each phase^[59]. (a) The first phase (0 week); (b) the second phase (4 weeks); (c) the third phase (8 weeks)

Fig. 4. Maximum amplitude projection (MAP) and corresponding computed vascular centerlines overlaid with segmented volumetric opticalresolution photoacoustic microscopy (OR-PAM) images of GB34, ST36 and non-acupoint sites in the osteoarthritis group (scale bar is 200 μm)^[73]

Fig. 5. PAT images of brain under acupuncture on the left or right GB34 point for a representative normal mouse, where the images are given at different time points and the color scale indicates relative strength of photoacoustic signal^[77]

Table 1. Technical parameters and characteristics of different optical imaging methods and their application scope