X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Reexamination Certificate
2002-06-19
2003-07-22
Bruce, David V. (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
C378S008000, C378S901000
Reexamination Certificate
active
06597756
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to computed tomographic (CT) imaging, and more particularly to methods and apparatus for reducing imaging artifacts an image generated using a multi-slice CT imaging system.
With the introduction of new X-ray source technologies into the CT field, a number of new reconstruction challenges have arisen. In particular, addressable field-array emitters and electron-beam sources (such as are in the “inverted cone” trajectory) lead to somewhat non-traditional data acquisition techniques, and therefore require reconstruction algorithms for use with the addressable field-array emitters and electron-beam sources.
BRIEF DESCRIPTION OF THE INVENTION
In one aspect, a method for acquiring views of an object is provided. The method includes acquiring a first quantity of views at a first position on a z-axis, acquiring a second quantity of views different from the first quantity at a second position on the z-axis different from the first position, and acquiring a third quantity of views equivalent to the first quantity at a third position on the z-axis different from the first position and the second position.
In another aspect, a computer for acquiring views of an object is provided. The computer is programmed to acquire a first quantity of views at a first position on a z-axis, acquire a second quantity of views different from the first quantity at a second position on the z-axis different from the first position, and acquire a third quantity of views equivalent to the first quantity at a third position on the z-axis different from the first position and the second position.
In a further aspect, a computed tomographic (CT) imaging for acquiring views of an object is provided. The CT system includes a detector array, at least one radiation source, and a computer coupled to the detector array and the radiation source and configured to acquire a first quantity of views at a first position on a z-axis, acquire a second quantity of views different from the first quantity at a second position on the z-axis different from the first position, and acquire a third quantity of views equivalent to the first quantity at a third position on the z-axis different from the first position and the second position.
In a still further aspect, a method for reconstructing an image of an object is provided. The method includes acquiring a plurality of circle trajectories wherein each circle trajectory includes a plurality of views and generating a single reconstruction for each of the acquired circle trajectories.
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Basu Samit K.
Hsieh Jiang
Armstrong Teasdale LLP
Bruce David V.
GE Medical Systems Global Technology Company LLC
Horton Esq. Carl B.
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