Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multifunctional in vivo vascular imaging using near-infrared II
  fluorescence   In vivo real-time epifluorescence imaging of mouse hindlimb vasculatures in
the second near-infrared region (NIR-II, 1.1~1.4 microns) is performed using
single-walled carbon nanotubes (SWNTs) as fluorophores. Both high spatial
resolution (~30 microns) and temporal resolution (<200 ms/frame) for small
vessel imaging are achieved 1-3 mm deep in the tissue owing to the beneficial
NIR-II optical window that affords deep anatomical penetration and low
scattering. This spatial resolution is unattainable by traditional NIR imaging
(NIR-I, 0.75~0.9 microns) or microscopic computed tomography (micro-CT), while
the temporal resolution far exceeds scanning microscopic imaging techniques.
Arterial and venous vessels are unambiguously differentiated using a dynamic
contrast-enhanced NIR-II imaging technique based on their distinct
hemodynamics. Further, the deep tissue penetration, high spatial and temporal
resolution of NIR-II imaging allow for precise quantifications of blood
velocity in both normal and ischemic femoral arteries, which are beyond the
capability of ultrasonography at lower blood velocity.

16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin