Imaging apparatus and method with compensation for object motion
First Claim
1. A method of generating a representation of target tissue in a region of tissue comprising:
- generating a first representation of the region of tissue;
generating a second representation of the region of tissue;
forming an association between each of a plurality of data values of the second representation and a corresponding neighborhood of data values of the first representation;
comparing data values of the second representation with data values of respective associated neighborhoods of the first representation to distinguish target tissue data values of the second representation from background tissue data values of the second representation; and
generating the representation of the target tissue using the target tissue data values of the second representation.
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Abstract
An apparatus and method for generating a data set representation of an object or tissue are described. Two image representation data sets for the object or tissue are generated by a CT or MRI scan or other known imaging process. The second data set is preferably generated with enhanced contrast between background tissue and the target tissue of interest, e.g., blood vessels, such as by the injection of a vascular contrast enhancing agent. The first data set is viewed as the union of plural data value neighborhoods, with each neighborhood preferably surrounding a central data value. Each data value of the second data set is compared to a neighborhood in the first data set. If a data value in the second data set is incompatible with the neighborhood, then it is concluded that the data value in the second data set is representative of contrast-enhanced target tissue and is therefore used to generate the final image data set of the target tissue.
163 Citations
44 Claims
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1. A method of generating a representation of target tissue in a region of tissue comprising:
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generating a first representation of the region of tissue; generating a second representation of the region of tissue; forming an association between each of a plurality of data values of the second representation and a corresponding neighborhood of data values of the first representation; comparing data values of the second representation with data values of respective associated neighborhoods of the first representation to distinguish target tissue data values of the second representation from background tissue data values of the second representation; and generating the representation of the target tissue using the target tissue data values of the second representation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of classifying data values in a data set representative of tissue in a region of tissue comprising:
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providing a first data set; generating a second data set representative of the region of tissue; forming an association between each of a plurality of data values of the second data set and a corresponding neighborhood of data values of the first data set; comparing data values of the second data set with data values of respective associated neighborhoods of the first data set; and classifying data values of the second data set according to the comparison performed during the comparing step between data values of the second data set and data values of the first data set.
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20. An imaging system for generating a representation of target tissue in a region of tissue comprising:
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a data collection subsystem comprising a source of radiation and a detector, said detector generating a first representation of the region of tissue and a second representation of the region of tissue; a data processor that forms an association between each of a plurality of data values of the second representation and a corresponding neighborhood of data values of the first representation, that compares data values of the second representation with data values of respective associated neighborhoods of the first representation to distinguish target tissue data values of the second representation from background tissue data values of the second representation and that generates the representation of the target tissue using the target tissue data values of the second representation. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method of generating an image of blood vessels in a region of tissue comprising:
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scanning the region of tissue to generate a first data set for the region of tissue; introducing a vascular contrast enhancing agent into the blood vessels in the region of tissue; after introducing the vascular contrast enhancing agent, scanning the region of tissue to generate a second data set for the region of tissue; forming an association between each of a plurality of data values of the second data set and a corresponding neighborhood of data values of the first data set; comparing data values of the second data set with data values of respective associated neighborhoods of the first data set to distinguish contrast-enhanced blood vessel data values of the second data set from background tissue data values of the second data set; and generating a data set for the blood vessels using the contrast-enhanced blood vessel data values of the second data set. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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Specification