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Abstract

In a method and an apparatus for the radiological examination of individual cardiac phases of a patient, an X-ray beam is rotated around and penetrates the heart of a patient from various angular positions and the attenuated X-ray beam strikes a radiation detector. The cardiac rhythm of the patient is determined in order to set the rotation time of the X-ray beam around the patient and to produce various control signals synchronized to the cardiac rhythm of the patient, so that radiological exposures of various cardiac phases are possible for the duration of a measurement interval. The setting of the rotation time of the X-ray beam so that the rotation time is larger or smaller, by the measurement interval, than the cycle time of the cardiac rhythm of the patient, so that after a few rotations there is a phase displacement of 360.degree. between the rotating X-ray beam and the cardiac rhythm of the patient. Projection groups of a partial or complete rotation of the respective cardiac phases are subsequently formed from the measurement data of projections of various cardiac phases for the duration of the measurement interval from which images of the respective cardiac phase are reconstructed.

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