Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High Resolution, Deep Imaging Using Confocal Time-of-flight Diffuse
  Optical Tomography   Light scattering by tissue severely limits how deep beneath the surface one
can image, and the spatial resolution one can obtain from these images. Diffuse
optical tomography (DOT) is one of the most powerful techniques for imaging
deep within tissue -- well beyond the conventional $\sim$10-15 mean scattering
lengths tolerated by ballistic imaging techniques such as confocal and
two-photon microscopy. Unfortunately, existing DOT systems are limited,
achieving only centimeter-scale resolution. Furthermore, they suffer from slow
acquisition times and slow reconstruction speeds making real-time imaging
infeasible. We show that time-of-flight diffuse optical tomography (ToF-DOT)
and its confocal variant (CToF-DOT), by exploiting the photon travel time
information, allow us to achieve millimeter spatial resolution in the highly
scattered diffusion regime ($> 50 $ mean free paths). In addition, we
demonstrate two additional innovations: focusing on confocal measurements, and
multiplexing the illumination sources allow us to significantly reduce the
measurement acquisition time. Finally, we rely on a novel convolutional
approximation that allows us to develop a fast reconstruction algorithm,
achieving a 100$\times$ speedup in reconstruction time compared to traditional
DOT reconstruction techniques. Together, we believe that these technical
advances serve as the first step towards real-time, millimeter resolution, deep
tissue imaging using DOT.

13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph