Feature-based composing for 3D MR angiography images
First Claim
10. A system for aligning a plurality of volumes from a patient, comprising:
- means for equalizing the plurality of volumes with the highest resolution of the plurality of volumes;
means for detecting edges in a first and a second of the plurality of volumes to form a first and a second edge map, respectively;
means for determining the correlation of the first edge map to the second edge map at a plurality of overlapping positions to determine the best alignment of the first volume and the second volume.
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Abstract
Multiple volumes that are to be aligned to form a single volume are processed. The system and method use an equalization step, a edge detection step and a correlation step to determine the overlapping positions between the first volume and the second volume of a volume pair having a maximum correlation value, and the best alignment of the first volume and the second volume of the volume pair is determined by the correlation value. A coarse correlation step using lower resolution volumes can be performed first followed by a fine correlation step using higher resolution images to save processing time. Initial preprocessing steps such as volume shearing can be performed. Equalization involves equalizing voxel size and edge detection can be performed using a Canny edge detector.
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Citations
20 Claims
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10. A system for aligning a plurality of volumes from a patient, comprising:
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means for equalizing the plurality of volumes with the highest resolution of the plurality of volumes;
means for detecting edges in a first and a second of the plurality of volumes to form a first and a second edge map, respectively;
means for determining the correlation of the first edge map to the second edge map at a plurality of overlapping positions to determine the best alignment of the first volume and the second volume. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18)
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12-1. The system as claimed in claim 10, further comprising means for aligning the remaining volumes based on the correlation step to form a single image.
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19. A system for aligning a first volume of image data and a second volume of image data from a single patient, comprising:
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a device for imaging a body part to form the first volume and the second volume;
a processor that equalizes data from the first volume and data from the second volume, that detects edges in the first volume to from a first edge map, that detects edges in the second volume to form a second edge map, that performs determines the correlation between the first edge map and the second edge map at a plurality of overlapping positions between the first edge map and the second edge map, and that determines the best alignment of the first volume and the second volume based on the correlation; and
means for displaying a single image derived from the first and second volumes. - View Dependent Claims (20)
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Specification