To provide a process for producing a hologram which facilitates the actual three-dimensional holography reconstruction of another physical system currently observed in the form of a human section and separated data slices and an apparatus therefor.

The method for forming the hologram and the apparatus 300 therefor includes a technique of forming the three-dimensional hologram of the physical system by exposing a film substrate 319 or other photosensitive medium to continuous two-dimensional images indicating a three-dimensional system. A low beam ratio is used for superposing the many 20 to 300 images on the substrate 319. The respective images are relatively weak but the combination of the series of the weak images appears as a single hologram of a distinct contour in the final.