7 results about "For Attenuation Correction" patented technology

This invention provides a PET image attenuation correction method, apparatus, and device, comprising: acquiring an unattenuated PET image and inputting it into a first generative adversarial network (GAN) to output a predicted human tissue distribution map; inputting the predicted human tissue distribution map and the unattenuated PET image into a second GAN cascaded with the first GAN to output a corresponding virtual CT image; and using the virtual CT image to perform attenuation correction on the unattenuated PET image to obtain an attenuated PET image. The human bone tissue enhancement generation framework constructed based on the GAN in this application exhibits significantly richer skeletal structures in CT images generated from NAC-PET images; furthermore, the CT images generated based on the human bone tissue enhancement generation framework constructed in this application achieve better results in terms of grayscale similarity and tissue consistency, thereby improving the accuracy of PET attenuation correction.

Systems and methods for generating synthetic attenuation correction maps (e.g., µ-maps), and for reconstructing images based on emission data and the synthetically generated attenuation correction maps, are disclosed. In some examples, a nuclear imaging reconstruction system receives emission data, such as positron emission tomography data, from an image scanning system. The nuclear imaging reconstruction system applies a segmentation process to the emission data and, based on the segmentation process, generates segmentation data characterizing a plurality of segments. Further, the nuclear imaging reconstruction system generates attenuation correction data that includes attenuation correction values for each of the plurality of segments. For example, based on the type of a particular segment (e.g., lung, heart, liver segments), the nuclear imaging reconstruction system assigns corresponding attenuation correction values. The nuclear imaging reconstruction system may reconstruct an image based on the emission data and the attenuation correction data.

This invention discloses a method and apparatus for attenuation correction of dynamically acquired PET cardiac images, relating to the field of biomedical signal processing. The method includes: simultaneously acquiring cardiac and respiratory signals and PET data; preprocessing the data to divide a joint phase interval; segmenting the heart, lung, and chest wall regions; constructing a dynamic attenuation baseline sequence; and optimizing the attenuation coefficient map by incorporating tracer metabolic kinetics characteristics; achieving attenuation compensation through phase matching and projection correction; reconstructing PET images of each phase and fusing them to generate a dynamic sequence; and judging the quality of the results through evaluation indicators, iteratively adjusting model parameters if the results do not meet the standards. The advantages of this invention are: avoiding artifacts by dividing the joint phase interval through simultaneous acquisition of motion signals; optimizing attenuation correction by incorporating tracer metabolic characteristics; and combining this with an evaluation iteration mechanism, thus efficiently improving the accuracy and quality of PET cardiac image correction.

Systems and methods of generating an attenuation map are disclosed. Computed tomography (CT) scan data for a CT scan including an imaging component is obtained. The CT scan data comprises a plurality of voxels each having a scanned CT value. A material in each voxel of the plurality of voxels is identified by comparing the scanned CT value for the voxel with predetermined CT values for a plurality of materials and a voxel attenuation value for each voxel is determined based on the predetermined CT value for the identified material. An attenuation map including the determined voxel attenuation value for each voxel is generated. The attenuation map is configured for attenuation correction of an imaging modality including the imaging component with a field of view of the imaging modality.

Systems and methods of generating an attenuation map are disclosed. Computed tomography (CT) scan data for a CT scan including an imaging component is obtained. The CT scan data comprises a plurality of voxels each having a scanned CT value. A material in each voxel of the plurality of voxels is identified by comparing the scanned CT value for the voxel with predetermined CT values for a plurality of materials and a voxel attenuation value for each voxel is determined based on the predetermined CT value for the identified material. An attenuation map including the determined voxel attenuation value for each voxel is generated. The attenuation map is configured for attenuation correction of an imaging modality including the imaging component with a field of view of the imaging modality.

A frame for attenuation correction. The attenuation map may be generated by applying the non-attenuation corrected emission image to one or more trained artificial neural networks. Attenuation correction may be performed on the non-attenuation-corrected emission image by using the attenuation map.

For attenuation correction in positron emission tomography (PET), three-dimensional image data (5) of a multitude of hardware components are obtained for use in a PET scan using a PET system (1). Based on the three-dimensional image data (5), an associated attenuation map is generated for each hardware component of the multitude. A subset of the multitude of hardware components, arranged within a predefined field of view of the PET system (1) during a PET scan, is selected. Based on the attenuation maps of this subset of hardware components, a common attenuation map is generated. Attenuation-corrected PET image data are then generated from the PET scan data using this common attenuation map.