  We propose a novel x-ray imaging system, Multi-Image X-ray Interferometer
Module (MIXIM), with which a very high angular resolution can be achieved even
with a small system size. MIXIM is composed of equally-spaced multiple slits
and an x-ray detector, and its angular resolution is inversely proportional to
the distance between them. Here we report our evaluation experiments of MIXIM
with a newly adopted CMOS sensor with a high spatial resolution of 2.5 {\mu}m.
Our previous experiments with a prototype MIXIM were limited to one-dimensional
imaging, and more importantly, the achieved angular resolution was only
{\sim}1", severely constrained due to the spatial resolution of the adopted
sensor with a pixel size of 4.25 {\mu}m. By contrast, one-dimensional images
obtained in this experiment had a higher angular resolution of 0.5" when a
configured system size was only {\sim}1 m, which demonstrates that MIXIM can
simultaneously realize a high angular resolution and compact size. We also
successfully obtained a two-dimensional profile of an x-ray beam for the first
time for MIXIM by introducing a periodic pinhole mask. The highest angular
resolution achieved in our experiments is smaller than 0.1" with a mask-sensor
distance of 866.5 cm, which shows the high scalability of MIXIM.
