  Quantum imaging, one of the pillars of quantum technologies, is well-suited
to study sensitive samples which require low-light conditions, like biological
tissues. In this context, interaction-free measurements (IFM) allow us infer
the presence of an opaque object without the photon interacting with the
sample. Current IFM schemes are designed for single-pixel objects, while
real-life samples are structured, multi-pixel objects. Here we extend the IFM
imaging schemes to multi-pixel, semi-transparent objects, by encoding the
information about the pixels into an internal degree of freedom, namely orbital
angular momentum (OAM). This allows us to image the pixels in parallel. Our
solution exhibits a better theoretical efficiency than the single-pixel case.
Our scheme can be extended to other degrees of freedom, like the photon radial
quantum number, in order to image 1D and 2D objects.
