FIELD: medicine.SUBSTANCE: visualisation systems comprises a stationary gentry, a rotary gentry placed behind the stationary gentry, an X-ray tube fixed on the rotary gentry rotating and emitting a polychromatic radiation crossing an area of examination. The emission has a medium emission intensity alternately switched over between at least two different emission intensities during a visualisation procedure. A double-layer detector matrix with an energy resolution in a photon counting mode records the emission crossing the area of examination and records the emission in at least two different ranges of intensities. The detector matrix is provided to form output signals with an energy resolution depending both on the emission intensity, and on the intensity range. A reconstruction unit performs a spectral reconstruction of the output signals with the energy resolution. A method for system manipulation involves the stages whereat the emission spectrum is switched over during the visualisation procedure; a threshold energy set according to emission spectrum switch-over; the emission is recorded, and a recorded emission energy is identified by the threshold energy set.EFFECT: using the invention enables extending the range of products for computed visualisation.15 cl, 11 dwg
SPECTRAL COMPUTED TOMOGRAPHY