General Electric Company

James P Stonestrom

Menahem F Nassi

An improvement is disclosed which is applicable to the method for constructing a two-dimensional representation of an object slice lying in a quasi-plane by positioning a radiation source providing a fan beam incident on the object, positioning detector means opposite the source and aligned therewith and lying in said quasi-plane for detecting radiation in said quasi-plane not absorbed or scattered by the object; effecting relative rotation between the object and the source-detector combination about an axis of rotation such that the source and detector means remain in the quasi-plane; effecting measuring projections from the source at a plurality of angular positions during the rotation to obtain a multiplicity of measured data readings from the detectors at each said projection; and reconstructing a two-dimensional representation of the object slice by convolving the data without reordering same, and scaling and back projecting same. Pursuant to the improvement, estimated detector data is generated at desired projection angles, by reflecting the measured detector data obtained during the said measuring projections, and the reconstruction step is performed utilizing both the measured and the estimated detector data. A system embodiment of the invention is also disclosed and claimed.

Computerized tomographic reconstruction method and system utilizing

An improvement is disclosed which is applicable to the method for constructing a two-dimensional representation of an object slice lying in a quasi-plane by positioning a radiation source providing a fan beam incident on the object, positioning detector means opposite the source and aligned therewith and lying in said quasi-plane for detecting radiation in said quasi-plane not absorbed or scattered by the object; effecting relative rotation between the object and the source-detector combination about an axis of rotation such that the source and detector means remain in the quasi-plane; effecting measuring projections from the source at a plurality of angular positions during the rotation to obtain a multiplicity of measured data readings from the detectors at each said projection; and reconstructing a two-dimensional representation of the object slice by convolving the data without reordering same, and scaling and back projecting same. Pursuant to the improvement, estimated detector data is generated at desired additional projection angles, by reflecting the measured detector data obtained during the said measuring projections, and the reconstruction step is performed utilizing both the measured and the estimated detector data.

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Palo Alto, CA, United States of America

James P Stonestrom