Square wave cone beam scanning trajectory for data completeness in three-dimensional computerized tomography
First Claim
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1. A scanning and data acquisition method for three-dimensional computerized tomography (CT) imaging of a field of view containing at least a portion of an object illuminated by a cone beam source, said method comprising:
- defining a source scanning trajectory as a path traversed by said source;
employing the cone beam source fixed with reference to a two-dimensional array detector with both source and detector movably positioned relative to the object in order to scan about the object;
specifying the source scanning trajectory as a square wave on a cylindrical surface surrounding the field of view such that each plane passing through the field of view intersects the scanning trajectory in at least one point; and
scanning at a plurality of positions along the source scanning trajectory to obtain cone beam projection data.
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Abstract
A configuration for three-dimensional cone beam computerized tomography imaging which allows a complete data set to be acquired in a practical manner, while providing fast data acquisition to minimize motion artifacts. An object within a field of view such that every plane passing through the field of view passes through the source scanning trajectory at least once.
43 Citations
24 Claims
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1. A scanning and data acquisition method for three-dimensional computerized tomography (CT) imaging of a field of view containing at least a portion of an object illuminated by a cone beam source, said method comprising:
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defining a source scanning trajectory as a path traversed by said source; employing the cone beam source fixed with reference to a two-dimensional array detector with both source and detector movably positioned relative to the object in order to scan about the object; specifying the source scanning trajectory as a square wave on a cylindrical surface surrounding the field of view such that each plane passing through the field of view intersects the scanning trajectory in at least one point; and scanning at a plurality of positions along the source scanning trajectory to obtain cone beam projection data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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13. A scanning and data acquisition system for three-dimensional computerized tomography (CT) imaging of a field of view containing at least a portion of an object illuminated by a cone beam source, said system comprising:
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a cone beam source; a two-dimensional array detector fixed in spaced alignment with reference to said source and both the detector and the source rotatably mounted to scan the object in order to acquire cone beam projection data; and scanning means for effecting relative motion between said source and the object, said source moving relative to the object along a source scanning trajectory specified as a square wave on a cylindrical surface surrounding the field of view such that each plane passing through the field of view intersects the scanning trajectory in at least one point; and means for acquiring cone beam projection data with said source at a plurality of positions on the scanning trajectory. - View Dependent Claims (15, 17)
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24. α
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Specification