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A holographic method has been developed that uses a single wavelength in the recording process to generate a multicolor image under white light reconstruction. The final product is a superposition of rainbow holograms, each of which is recorded with a specific orientation of the reference beam. The result is that each scene is encoded with a specific color. The image quality is analyzed and compared with that of other rainbow holograms.

The rotating slit is a time-varying coded aperture that can be used advantageously with a scintillation camera in imaging of static radioactive objects. The coded image obtained from an on-axis slit conveys no tomographic information, but when the slit is displaced away from the axis of rotation, tomographic information can be obtained. From one set of coded images, each plane of a 3-D object can be brought in focus by shift operations and a computed-tomography algorithm. Inverse filtering is necessary to remove the side lobes of the point spread function. The intrinsic resolution of the camera, the slit width, the filter function, and the display all affect the lateral resolution, while the object distance, the off-axis distance of the slit, and the lateral resolution determine the longitudinal resolution of the system.