X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1998-02-11
2000-03-07
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 8, 378 15, 378901, G01N 2304
Patent
active
060350148
ABSTRACT:
A method and apparatus for detecting objects in computed tomography (CT) data are disclosed. Sheet-shaped objects such as sheet explosives can be detected by analyzing a neighborhood of voxels surrounding a test voxel. If the density of the test voxel is sufficiently different from the mean density of the neighboring voxels, then it is concluded that the test voxel is associated with a sheet object. Sheet objects can also be detected by eroding the CT data so as to eliminate voxels associated with thin objects. Remaining objects are then subtracted from the original data, leaving only thin sheet-shaped objects. Bulk objects can be detected by a modified morphological connected components labeling (CCL) approach which performs a series of erosion and dilation steps to separate adjacent objects in the data such that they can be individually labeled and analyzed. The process of the invention can be carried out in multiple paths. That is, for example, a sheet object detection process and a bulk object detection process can be implemented separately and in parallel. During the sheet object detection process, the data can be analyzed to identify bulk objects. Those objects can then be removed from the data and the remaining data can then be analyzed to identify any remaining sheets. Redundant analysis of data is eliminated.
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Bechwati Ibrahim M.
Crawford Carl R.
Hiraoglu Muzaffer
Simanovsky Sergey
Analogic Corporation
Bruce David V.
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