A Review of Indocyanine Green Fluorescent Imaging in Surgery

Table 9

An example of the light attenuation in an ICG imaging system.

Row	Component	Attenuation	Remaining intensity
1	LED 780-66-60	0.2	𝐼0 = 1 W/sr
2	Fs, ET775_50x	0.8	𝐼𝑠 = 0.8 W/sr
3	Tissue irradiance		𝐸𝑡 = 80 W/m^2
4	Tissue, 1 mm	0.45	𝐸𝑒 = 36 W/m^2
5	Fluorescence	0.0027	𝐸𝑓 = 0.10 W/m^2
6	Tissue, 1 mm	0.45	45 mW/m^2
7	Lambertian S.	0.32	𝐼𝑡 = 14 mW/sr
8	Fc, ET845_55 m	0.3	𝐼𝑐 = 4.3 mW/sr
9	Irradiance, f/1.1	0.82	𝐸𝑏 = 3.5 mW/m^2
Response of the Hamamatsu ER-150 low light
10	Power per pixel		𝑃𝑝 = 0.15 pW
11	Photons per pixel		𝑁𝑝 = 6.1⋅10^5 photons/s
12	Detected photons	0.25	𝑁𝑒 = 1.5⋅10^5 electrons/s
13	Optimal exposure		𝑡=98ms
14	Signal to noise		SNR = 63 dB