SU-GG-J-29: Feasibility of Improving Cone Beam CT Number Consistency with a Scatter-Correction Algorithm

2010 ◽  
Vol 37 (6Part9) ◽  
pp. 3151-3151
Author(s):  
J Li ◽  
W Yao ◽  
Y Xiao ◽  
Y Yu
Keyword(s):  
Cone Beam Ct ◽  
Scatter Correction ◽  
Cone Beam ◽  
Correction Algorithm ◽  
Ct Number

X-ray scatter correction algorithm for cone beam CT imaging

2004 ◽  
Vol 31 (5) ◽  
pp. 1195-1202 ◽  
Author(s):  
Ruola Ning ◽  
Xiangyang Tang ◽  
David Conover
Keyword(s):  
Cone Beam Ct ◽  
Scatter Correction ◽  
Ct Imaging ◽  
Cone Beam ◽  
Correction Algorithm ◽  
X Ray

scholarly journals Low-Dose and Scatter-Free Cone-Beam CT Imaging Using a Stationary Beam Blocker in a Single Scan: Phantom Studies

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Xue Dong ◽  
Michael Petrongolo ◽  
Tianye Niu ◽  
Lei Zhu
Keyword(s):  
Iterative Reconstruction ◽  
Low Dose ◽  
Cone Beam Ct ◽  
Scatter Correction ◽  
Cone Beam ◽  
Projection Data ◽  
Reconstruction Algorithms ◽  
Ct Number ◽  
Combine Measurement ◽  
Full Scan

Excessive imaging dose from repeated scans and poor image quality mainly due to scatter contamination are the two bottlenecks of cone-beam CT (CBCT) imaging. Compressed sensing (CS) reconstruction algorithms show promises in recovering faithful signals from low-dose projection data but do not serve well the needs of accurate CBCT imaging if effective scatter correction is not in place. Scatter can be accurately measured and removed using measurement-based methods. However, these approaches are considered unpractical in the conventional FDK reconstruction, due to the inevitable primary loss for scatter measurement. We combine measurement-based scatter correction and CS-based iterative reconstruction to generate scatter-free images from low-dose projections. We distribute blocked areas on the detector where primary signals are considered redundant in a full scan. Scatter distribution is estimated by interpolating/extrapolating measured scatter samples inside blocked areas. CS-based iterative reconstruction is finally carried out on the undersampled data to obtain scatter-free and low-dose CBCT images. With only 25% of conventional full-scan dose, our method reduces the average CT number error from 250 HU to 24 HU and increases the contrast by a factor of 2.1 on Catphan 600 phantom. On an anthropomorphic head phantom, the average CT number error is reduced from 224 HU to 10 HU in the central uniform area.

An online cross-scatter correction algorithm for dual-source CT: effects on CT number accuracy and noise

2009 ◽  
Author(s):  
Christian D. Eusemann ◽  
Anja Apel ◽  
Bernhard Schmidt ◽  
Alisa I. Walz-Flannigan ◽  
Megan C. Jacobsen ◽  
...  
Keyword(s):  
Scatter Correction ◽  
Dual Source Ct ◽  
Correction Algorithm ◽  
Ct Number ◽  
Dual Source ◽  
Cross Scatter

scholarly journals Scatter correction for cone-beam CT in radiation therapy

2009 ◽  
Vol 36 (6Part1) ◽  
pp. 2258-2268 ◽  
Author(s):  
Lei Zhu ◽  
Yaoqin Xie ◽  
Jing Wang ◽  
Lei Xing
Keyword(s):  
Radiation Therapy ◽  
Cone Beam Ct ◽  
Scatter Correction ◽  
Cone Beam

TU-D-I-611-06: A Direct, Empirical Method for X-Ray Scatter Correction in Digital Radiography and Cone-Beam CT

2005 ◽  
Vol 32 (6Part16) ◽  
pp. 2092-2093 ◽  
Author(s):  
J Siewerdsen ◽  
B Bakhtiar ◽  
D Moseley ◽  
S Richard ◽  
H Keller ◽  
...  
Keyword(s):  
Digital Radiography ◽  
Cone Beam Ct ◽  
Scatter Correction ◽  
Empirical Method ◽  
Cone Beam ◽  
X Ray

SU-FF-I-22: Scatter Correction for Flat Detector Cone-Beam CT Based On Simulated Sphere Models

2007 ◽  
Vol 34 (6Part3) ◽  
pp. 2342-2343 ◽  
Author(s):  
M Bertram ◽  
S Hohmann ◽  
J Wiegert
Keyword(s):  
Cone Beam Ct ◽  
Scatter Correction ◽  
Cone Beam ◽  
Flat Detector
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