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System and method for helical cone-beam computed tomography with exact reconstruction
System and method for helical cone-beam computed tomography with exact reconstruction
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机译:精确重建螺旋锥束计算机断层扫描的系统和方法
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摘要
A helical conebeam computed tomography imaging system includes an x-ray source (12) that produces an x ray conebeam, and an x-ray detector array (16) that detects the x ray conebeam after passing through an examination region (14). The x-ray detector array (16) generates projection data in a detector coordinate system defined with reference to the detector array (16). A derivative processor (60) computes a derivative of the projection data with respect to a helix angle of the helical trajectory at fixed projection direction to generate differentiated projection data. A convolution processor (64) convolves the differentiated projection data with a kernel function to produce filtered projection data. The convolving is performed in the detector coordinate system. A backprojector (42, 82) backprojects the filtered projection data to obtain an image representation.
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