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Imaging in the second near-infrared II (NIR-II) window, a kind of biomedical imaging technology with characteristics of high sensitivity, high resolution, and real-time imaging, is commonly used in the diagnosis of brain diseases. Compared with the conventional visible light (400–750 nm) and NIR-I (750–900 nm) imaging, the NIR-II has a longer wavelength of 1000–1700 nm. Notably, the superiorities of NIR-II can minimize the light scattering and autofluorescence of biological tissue with the depth of brain tissue penetration up to 7.4 mm. Herein, we summarized the main principles of NIR-II in animal models of traumatic brain injury, cerebrovascular visualization, brain tumor, inflammation, and stroke. Simultaneously, we encapsulated the  in vivo  process of NIR-II probes and their  in vivo  and  in vitro  toxic effects. We further dissected its limitations and following optimization measures.

Second near-infrared (NIR-II) imaging: a novel diagnostic technique for brain diseases