  In this paper, we continue our phenomenological studies of heavy-ion
collisions using 3+1d anisotropic hydrodynamics (aHydro). In previous works, we
compared quasiparticle aHydro (aHydroQP) with ALICE 2.76 TeV Pb-Pb and RHIC 200
GeV Au-Au collision results. At both energies, the agreement was quite good
between aHydroQP and the experimental data for many observables. In this work,
we present comparisons of the Hanbury Brown--Twiss (HBT) radii and their ratios
determined using pi+ pi+ pairs produced in 200 GeV Au-Au collisions. We first
present comparisons with STAR results for the HBT radii and their ratios. We
then present comparisons with PHENIX results for the HBT radii and their
ratios. In both cases, we find reasonable agreement between aHydroQP
predictions and available experimental results for the ratios of HBT radii. At
the level of the radii themselves, in some cases quantitative differences on
the order of 10-20% remain, which deserve further study.
