Abstract: An imaging system utilizing a scintillation camera for photographing subjects emitting gamma and X-radiation. Masks are sequentially positioned between the subject and the camera to produce a sequence of shadowgrams upon the face of the camera. Output signals of the camera are summed together to give an array of sum signals, the array of sum signals being Fourier transformed followed by a matched filtering by multiplication of the frequency terms by an array of factors utilized in generating the masks. Phase factors are applied to the camera output signals, either before the Fourier transformation or during the matched filtering, the phase factors identifying the masks utilized in producing the respective shadowgrams. An inverse Fourier transformation then results in an image of the subject.

Abstract: A nuclear imaging system in which a substantially on-axis Fresnel zone plate positioned between a source of nuclear radiation in living tissue and a spatial detector is moved in a predetermined time sequence in synchronism with motion of a bar pattern formed at the spatial detector output to improve suppression of unwanted spatial frequency components and to facilitate production of an image of the nuclear source.