Computed tomography image reconstruction
AssigneeGeneral Electric Company
InventorsJed Douglas Pack, Kai Zeng, Adam Budde
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Abstract
Approaches for performing computed tomographic image reconstruction are described. In one embodiment, a full or almost full scan of scan data is acquired and a plurality of image reconstructions are performed based on the scan data, wherein the plurality of image reconstructions result in a corresponding plurality of image volumes wherein the image reconstructions use different view weighting functions. Further, the present approaches provide for combining the plurality of image volumes together to produce a final image volume.
Claims21
A method of reconstructing a computed tomography (CT) image, the method comprising:
- acquiring a set of projection data for an imaged volume using a CT imaging system;
- reconstructing at least a first intermediate reconstruction and a second intermediate reconstruction using the acquired set of projection data, wherein the first intermediate reconstruction and the second intermediate reconstruction are reconstructed using different view weightings;
- masking the first intermediate reconstruction and the second intermediate reconstruction to select different subdivisions of image data;
- applying a frequency transform to transform each subdivision of image data to frequency space;
- masking the frequency transform of each subdivision to select frequency information of interest for each of the first intermediate reconstruction and the second intermediate reconstruction;
- for each subdivision, combining the frequency information selected from the first intermediate reconstruction with the frequency information selected from the second intermediate reconstruction to generate a fully sampled frequency space;
- and
- applying an inverse frequency transform to the fully sampled frequency space to generate a final image volume.
A non-transitory, computer-readable medium configured to store one or more routines executable by a processing system, the routines, when executed, causing acts to be performed comprising:
- accessing a set of axial CT projection data;
- reconstructing a first intermediate reconstruction using the set of axial CT projection data and a first view weighting;
- reconstructing a second intermediate reconstruction using the set of axial CT projection data and a second view weighting that differs from the first view weighting;
- selecting, from the first intermediate reconstruction and the second intermediate reconstruction, a plurality of subdivisions of data corresponding to different portions of a final image to be reconstructed;
- transforming the plurality of subdivisions of data into corresponding frequency representations;
- masking the frequency representations to select frequency information of interest for each of the first intermediate reconstruction and the second intermediate reconstruction;
- combining the selected frequency information from the first intermediate reconstruction and the second intermediate reconstruction to generate a fully sampled frequency space for each subdivision;
- and
- applying an inverse frequency transform to the fully sampled frequency space to generate the final image.
A computed tomography (CT) imaging system, comprising:
- a source of X-ray emissions;
- a detector positioned opposite from the source with respect to an imaging volume, wherein the detector is configured to generate signals in response to the X-rays, when emitted;
- a rotational positioning system configured to rotate the source and the detector about the imaging volume;
- a detector acquisition system configured to acquire the signals generated by the detector;
- a memory storing one or more routines;
- and
- a processing component configured to access the signals from the data acquisition system and to execute the one or more routines stored in the memory, wherein the one or more routines, when executed by the processing component, cause acts to be performed comprising:
- reconstructing at least a first intermediate reconstruction and a second intermediate reconstruction using the signals acquired by the detector acquisition system, wherein the first intermediate reconstruction and the second intermediate reconstruction are reconstructed using different view weightings;
- dividing the first intermediate reconstruction and the second intermediate reconstruction into corresponding subdivisions of data;
- applying a fast Fourier transform to transform each subdivision of image data to frequency representations;
- combining selected frequency information from the first intermediate reconstruction with the selected frequency information from the second intermediate reconstruction to generate a fully sampled frequency space for each subdivision;
- and
- applying an inverse fast Fourier transform to the fully sampled frequency space to generate a final image volume.
Dependencies are inferred from the claim text.