  We report a time-resolved single photon counting (TCSPC) imaging system based
on a line-scanning architecture. The system benefits from the high fill-factor,
active area, and large dimension of an advanced CMOS single photon avalanche
diode (SPAD) array line-sensor. A two-dimensional image is constructed using a
moving mirror to scan the line-sensor field-of-view (FOV) across the target, to
enable the efficient acquisition of a two-dimensional 0.26 Mpixel TCSPC image.
We demonstrate the capabilities of the system for TCSPC imaging and locating
objects obscured in scattering media - specifically to locate a series of
discrete point sources of light along an optical fibre submerged in a highly
scattering solution. We demonstrate that by selectively imaging using early
arriving photons which have undergone less scattering than later arriving
photons, our TCSPC imaging system is able to locate the position of discrete
point sources of light than a non-time-resolved imaging system.
