Combined emission tomography and computer tomography unit
OwnerThomas Flohr, Otto Sembritzkiinventors
Life of this patent
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Abstract
A combined emission tomography and computer tomography unit (ET/CT unit) is for imaging an object to be examined, and a method is for producing ET images of an object to be examined with the aid of a combined ET/CT unit. In the method, account is taken during production of the ET images of the spatial distribution, measured by the CT, of the attenuation coefficients in the measuring field of the CT in order to correct the measured ET image. Attenuation coefficients of the object that are disposed outside the measuring field are determined by extrapolation of detector channels and likewise used to correct the ET images.
Claims29
A combined emission tomography and computer tomography unit (ET/CT unit) for imaging an object to be examined, comprising:
- a scintillation detector and an evaluation unit for recording radiation emitted from the object to be examined;
- a computer tomography unit (CT) including at least one radiation source rotating about a system axis, from which a fan-shaped radiation beam emanates that scans a measuring field and supplies, together with a detector system, output signals from which the distribution of the attenuation coefficients of the object to be examined are reconstructable with reference to a reconstruction field;
- and
- means for correcting the detected data of the emission tomography unit (ET) using the distribution, examined by the CT, of the attenuation coefficients in the object to be examined, wherein the reconstruction field is larger than the measuring field.
A method for producing ET images from an object to be examined with the aid of a combined ET and CT unit, comprising:
- correcting a measured ET image using, during production of the ET images of the spatial distribution measured by the CT, attenuation coefficients in a measuring field of the CT, wherein the attenuation coefficients of the object to be examined, that are disposed outside the measuring field, are determined by extrapolation of detector channels.
Dependencies are inferred from the claim text.