Method and apparatus for performing computed tomography

In a method and an apparatus for performing computed tomography using radiation, the apparatus includes a data selecting unit which divides into a plurality of groups and stores the projection data signals provided by a multitude of radiation beams being projected along several different directions...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	INOUYE, TAMON, MIZUTANI, HIROYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COMPUTING COUNTING DIAGNOSIS HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATIONTECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING ORPROCESSING OF MEDICAL OR HEALTHCARE DATA HUMAN NECESSITIES HYGIENE IDENTIFICATION IMAGE DATA PROCESSING OR GENERATION, IN GENERAL INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTEDFOR SPECIFIC APPLICATION FIELDS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEDICAL OR VETERINARY SCIENCE PHYSICS SURGERY TESTING
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Beschreibung
Zusammenfassung:	In a method and an apparatus for performing computed tomography using radiation, the apparatus includes a data selecting unit which divides into a plurality of groups and stores the projection data signals provided by a multitude of radiation beams being projected along several different directions through a slice to be imaged in a subject and penetrating the slice from the external circumference of it with each of the groups corresponding to the beams penetrating along selected directions within a specific scan sector less than 180 DEG ; a Fourier transform unit for calculating sample values for the one-dimensional Fourier transform of a projection function formed by each group of said projection data signals; a function calculating unit for calculating sample values for the one-dimensional Fourier transforms as mentioned above for a plurality of projecting directions selected outside said specific scan sector; and a reconstruction unit for calculating the absorption coefficient distribution of the radiation beams in said slice from both said sets of sample values, and a display unit.