Method for computed tomography of a periodically moving object to be examined, and a CT unit for carrying out this method
First Claim
Patent Images
1. A method for producing CT images of a periodically moving area to be examined, comprising:
- scanning the area to be examined with the aid of a beam, emanating from a focus, with a multiplicity of rays relating to a multiplicity of detector elements of a detector array, the focus and the detector array being relatively displaced and supplying data from which a change in attenuation of the rays between the focus and detector elements is determinable;
collecting movement data from the periodically moving area to be examined, the detector data and data resulting therefrom being assignable to the movement states;
using only output data, correlated with a specific movement state of the body region, to compose at least one CT image;
dividing the output data, supplied during the movement of the focus on a spiral segment of sufficient length for reconstructing a CT image and assigned to specific movement states, into output data with reference to Nseg subsegments, reconstructing segment images by back projection and filtering, referred to movement state, with an image plane inclined to the system axis;
combining segment images belonging to a subsegment and correlated with a movement state to form a component image, referred to movement state, with reference to a target image plane; and
combining component images, referred to movement state, for at least one target image plane to form resulting at least one CT image of a specific movement state.
2 Assignments
0 Petitions
Accused Products
Abstract
A method is for producing CT images of a periodically moving object to be examined, in particular a method for cardio volume reconstruction for multi-row CT units in spiral mode. A multi-row CT unit designed is further designed therefore. A small partial revolution segments along a revolution spiral is used to calculate in each case per partial revolution segment a plurality of segment images that are converted in a second step to partial images in the target image plane (for example axial plane) and are assembled with the correct phase to form complete images.
-
Citations
44 Claims
-
1. A method for producing CT images of a periodically moving area to be examined, comprising:
-
scanning the area to be examined with the aid of a beam, emanating from a focus, with a multiplicity of rays relating to a multiplicity of detector elements of a detector array, the focus and the detector array being relatively displaced and supplying data from which a change in attenuation of the rays between the focus and detector elements is determinable;
collecting movement data from the periodically moving area to be examined, the detector data and data resulting therefrom being assignable to the movement states;
using only output data, correlated with a specific movement state of the body region, to compose at least one CT image;
dividing the output data, supplied during the movement of the focus on a spiral segment of sufficient length for reconstructing a CT image and assigned to specific movement states, into output data with reference to Nseg subsegments, reconstructing segment images by back projection and filtering, referred to movement state, with an image plane inclined to the system axis;
combining segment images belonging to a subsegment and correlated with a movement state to form a component image, referred to movement state, with reference to a target image plane; and
combining component images, referred to movement state, for at least one target image plane to form resulting at least one CT image of a specific movement state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
-
-
43. A method for producing CT images of a periodically moving area to be examined, comprising:
-
supplying data, from which a change in attenuation of rays between a relatively displaceable focus and detector elements of an array is determinable;
collecting movement data from the periodically moving area to be examined, detector data and collected movement data being assignable to the movement states;
using only output data, correlated with a specific movement state, to compose at least one CT image;
dividing the output data, supplied during the movement of the focus on a spiral segment of sufficient length for reconstructing a CT image and assigned to specific movement states, into output data with reference to Nseg subsegments, reconstructing segment images with an image plane;
combining segment images belonging to a subsegment and correlated with a movement state to form a component image with reference to a target image plane; and
combining component images, referred to movement state, for at least one target image plane to form resulting at least one CT image of a specific movement state. - View Dependent Claims (44)
-
Specification