TABLE 1.

Penetration depth–resolution performance of fluorescence imaging at different windows

Aspect		Visible	NIR‐I	NIR‐IIa	NIR‐IIb
Penetration depth	Ex vivo	∼2 mm	4–7 mm	∼10 mm	11–20 mm
	In vivo	∼0.1 mm	1–3 mm	∼4 mm	∼3–5 mm
Depth‐to‐resolution ratio	In vivo	∼5	∼15	∼400	∼700

Source: Reproduced with permission.^{[ 48 ]} Copyright 2020, American Chemical Society.