3D-weighted cone beam filtered backprojection (CB-FBP) algorithm for image reconstruction at low-helical pitches to improve noise characteristics and dose efficiency

2006 ◽  
Author(s):  
Xiangyang Tang ◽  
Jiang Hsieh ◽  
Roy A. Nilsen
Keyword(s):  
Image Reconstruction ◽  
Cone Beam ◽  
Filtered Backprojection ◽  
Noise Characteristics ◽  
Dose Efficiency

scholarly journals Extending Three-Dimensional Weighted Cone Beam Filtered Backprojection (CB-FBP) Algorithm for Image Reconstruction in Volumetric CT at Low Helical Pitches

2006 ◽  
Vol 2006 ◽  
pp. 1-8 ◽  
Author(s):  
Xiangyang Tang ◽  
Jiang Hsieh ◽  
Roy A. Nilsen ◽  
Scott M. McOlash
Keyword(s):  
Three Dimensional ◽  
Reconstruction Algorithm ◽  
Cone Beam ◽  
Projection Data ◽  
Angular Range ◽  
Filtered Backprojection ◽  
Tomographic Images ◽  
Noise Characteristics ◽  
Dose Efficiency ◽  
Full Scan

A three-dimensional (3D) weighted helical cone beam filtered backprojection (CB-FBP) algorithm (namely, original 3D weighted helical CB-FBP algorithm) has already been proposed to reconstruct images from the projection data acquired along a helical trajectory in angular ranges up to[0,2π]. However, an overscan is usually employed in the clinic to reconstruct tomographic images with superior noise characteristics at the most challenging anatomic structures, such as head and spine, extremity imaging, and CT angiography as well. To obtain the most achievable noise characteristics or dose efficiency in a helical overscan, we extended the 3D weighted helical CB-FBP algorithm to handle helical pitches that are smaller than1:1(namely extended 3D weighted helical CB-FBP algorithm). By decomposing a helical over scan with an angular range of[0,2π+Δβ]into a union of full scans corresponding to an angular range of[0,2π], the extended 3D weighted function is a summation of all 3D weighting functions corresponding to each full scan. An experimental evaluation shows that the extended 3D weighted helical CB-FBP algorithm can improve noise characteristics or dose efficiency of the 3D weighted helical CB-FBP algorithm at a helical pitch smaller than1:1, while its reconstruction accuracy and computational efficiency are maintained. It is believed that, such an efficient CB reconstruction algorithm that can provide superior noise characteristics or dose efficiency at low helical pitches may find its extensive applications in CT medical imaging.

Minimization of over-ranging in helical volumetric CT via hybrid cone beam image reconstruction-Benefits in dose efficiency

2008 ◽  
Vol 35 (7Part1) ◽  
pp. 3232-3238 ◽  
Author(s):  
Xiangyang Tang ◽  
Jiang Hsieh ◽  
Fang Dong ◽  
Jiahua Fan ◽  
Thomas L. Toth
Keyword(s):  
Image Reconstruction ◽  
Cone Beam ◽  
Beam Image ◽  
Dose Efficiency ◽  
Volumetric Ct

A three-dimensional-weighted cone beam filtered backprojection (CB-FBP) algorithm for image reconstruction in volumetric CT—helical scanning

2006 ◽  
Vol 51 (4) ◽  
pp. 855-874 ◽  
Author(s):  
Xiangyang Tang ◽  
Jiang Hsieh ◽  
Roy A Nilsen ◽  
Sandeep Dutta ◽  
Dmitry Samsonov ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
Three Dimensional ◽  
Cone Beam ◽  
Filtered Backprojection ◽  
Volumetric Ct
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