CT image reconstruction of a moving examination object
First Claim
1. A method for reconstructing image data of a moving examination object from measured data, the measured data being acquired during a rotating movement of a radiation source of a computed tomography system around the examination object, the method comprising:
- determining, by a computer, first image data from the measured data;
determining movement information by forming a difference between images from the determined first image data;
determining at least,a first time instant, using at least a first continuous function or a second continuous function, of relatively little movement of a first site within the examination object from the determined movement information, anda second time instant, using one of the at least a first continuous function and a second continuous function used in determining the first time instant, of relatively little movement of a second site within the examination object from the determined movement information; and
reconstructing second image data, using the measured data corresponding to the determined at least first and second time instants, wherein each of the first and second situ corresponds to a specific axial section through the examination object.
3 Assignments
0 Petitions
Accused Products
Abstract
A method is disclosed for reconstructing image data of a moving examination object from measured data, the measured data having been acquired during a rotating movement of a radiation source of a computed tomography system around the examination object. In at least one embodiment, first image data are determined from the measured data. Movement information is determined from the first image data by forming the difference between images. Time instants of little movement of the examination object are determined from the movement information, the determined time instants being dependent on the location or site within the examination object. Finally, second image data are reconstructed taking the determined time instants into account. These data can be output as result images.
7 Citations
18 Claims
-
1. A method for reconstructing image data of a moving examination object from measured data, the measured data being acquired during a rotating movement of a radiation source of a computed tomography system around the examination object, the method comprising:
-
determining, by a computer, first image data from the measured data; determining movement information by forming a difference between images from the determined first image data; determining at least, a first time instant, using at least a first continuous function or a second continuous function, of relatively little movement of a first site within the examination object from the determined movement information, and a second time instant, using one of the at least a first continuous function and a second continuous function used in determining the first time instant, of relatively little movement of a second site within the examination object from the determined movement information; and reconstructing second image data, using the measured data corresponding to the determined at least first and second time instants, wherein each of the first and second situ corresponds to a specific axial section through the examination object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A computer tomography (CT) system comprising:
a control and computing unit configured to, determine first image data from measured data, the measured data being acquired during a rotating movement of a radiation source of the CT system around a moving examination object; determine movement information by forming a difference between images from the determined first image data; determine at least, a first time instant, using at least a first continuous function or a second continuous function, of relatively little movement of a first site within the examination object from the determined movement information, and a second time instant, using one of the at least a first continuous function and a second continuous function used in determining the first time instant, of relatively little movement of a second site within the examination object from the determined movement information; and reconstruct second image data, using the measured data corresponding to the determined at least first and second time instants, wherein each of the first and second sites corresponds to a specific axial section through the examination object.
-
16. A non-transitory computer readable medium including a computer program product, the computer program product comprising program code segments, which when executed by a processor, causes the processor to perform functions including:
-
determining first image data from measured data, the measured data being acquired during a rotating movement of a radiation source of the CT system around a moving examination object; determining movement information by forming a difference between images from the determined first image data; determining at least a first time instant, using at least a first continuous function or a second continuous function, of relatively little movement of a first site within the examination object from the determined movement information, and a second time instant, using one of the at least a first continuous function and a second continuous function used in determining the first time instant, of relatively little movement of a second site within the examination object from the determined movement information; and reconstructing second image data, using the measured data corresponding to the determined at least first and second time instants, wherein each of the first and second sites corresponds to a specific axial section through the examination object. - View Dependent Claims (17, 18)
-
Specification