That is actually quite clever, ingenious and high resolution.
I was once involved in another way to get what at the time were cutting edge high energy satellite images by rotating a set of scintillation counters with a second set in front creating a quadratic residue mask. It imaged the sky in 1D at much better than anything prior and the spinning allowed a 2D image. The resolution was pretty poxy though.
Shadow mask tricks were popular back then since nobody had been able to focus such energetic radiation well enough. Once they could it was quickly outclassed by glancing incidence optics with seriously high resolution in the X-ray band.