Calibration of megavoltage cone-beam CT for radiotherapy dose calculations: Correction of cupping artifacts and conversion of CT numbers to electron density

2008 ◽  
Vol 35 (3) ◽  
pp. 849-865 ◽  
Author(s):  
Steven F. Petit ◽  
Wouter J. C. van Elmpt ◽  
Sebastiaan M. J. J. G. Nijsten ◽  
Philippe Lambin ◽  
André L. A. J. Dekker
Keyword(s):  
Electron Density ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Dose Calculations ◽  
Cupping Artifacts ◽  
Radiotherapy Dose ◽  
Megavoltage Cone Beam Ct

scholarly journals A Method to Improve Electron Density Measurement of Cone-Beam CT Using Dual Energy Technique

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Kuo Men ◽  
Jian-Rong Dai ◽  
Ming-Hui Li ◽  
Xin-Yuan Chen ◽  
Ke Zhang ◽  
...  
Keyword(s):  
Electron Density ◽  
Cone Beam Ct ◽  
Density Measurement ◽  
Dual Energy ◽  
Cone Beam ◽  
Imaging Method ◽  
Basis Material ◽  
X Ray ◽  
Dual Energy Imaging ◽  
Set Up

Purpose. To develop a dual energy imaging method to improve the accuracy of electron density measurement with a cone-beam CT (CBCT) device.Materials and Methods. The imaging system is the XVI CBCT system on Elekta Synergy linac. Projection data were acquired with the high and low energy X-ray, respectively, to set up a basis material decomposition model. Virtual phantom simulation and phantoms experiments were carried out for quantitative evaluation of the method. Phantoms were also scanned twice with the high and low energy X-ray, respectively. The data were decomposed into projections of the two basis material coefficients according to the model set up earlier. The two sets of decomposed projections were used to reconstruct CBCT images of the basis material coefficients. Then, the images of electron densities were calculated with these CBCT images.Results. The difference between the calculated and theoretical values was within 2% and the correlation coefficient of them was about 1.0. The dual energy imaging method obtained more accurate electron density values and reduced the beam hardening artifacts obviously.Conclusion. A novel dual energy CBCT imaging method to calculate the electron densities was developed. It can acquire more accurate values and provide a platform potentially for dose calculation.

Dose Recalculation and the Dose-Guided Radiation Therapy (DGRT) Process Using Megavoltage Cone-Beam CT

2009 ◽  
Vol 74 (2) ◽  
pp. 583-592 ◽  
Author(s):  
Joey Cheung ◽  
Jean-François Aubry ◽  
Sue S. Yom ◽  
Alexander R. Gottschalk ◽  
Juan Carlos Celi ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Dose Recalculation ◽  
Megavoltage Cone Beam Ct

Diaphragm motion quantification in megavoltage cone-beam CT projection images

2010 ◽  
Vol 37 (5) ◽  
pp. 2312-2320 ◽  
Author(s):  
Mingqing Chen ◽  
R. Alfredo Siochi
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Projection Images ◽  
Megavoltage Cone Beam Ct ◽  
Diaphragm Motion

WE-D-I-6B-01: Soft Tissue Visualization Using a Highly Efficient Megavoltage Cone Beam CT Imaging System

2005 ◽  
Vol 32 (6Part19) ◽  
pp. 2131-2131 ◽  
Author(s):  
F Ghelmansarai ◽  
A Bani-Hashemi ◽  
J Pouliot ◽  
E Calderon ◽  
P Hernandez ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Imaging System ◽  
Cone Beam Ct ◽  
Ct Imaging ◽  
Cone Beam ◽  
Highly Efficient ◽  
Megavoltage Cone Beam Ct

SU-FF-I-53: The Impact of Portal Imager Shifts and the Assumption of Rigid Isocentricity On Megavoltage Cone Beam CT Images

2005 ◽  
Vol 32 (6Part3) ◽  
pp. 1916-1916 ◽  
Author(s):  
O Morin ◽  
S Bose ◽  
J Chen ◽  
M Aubin ◽  
J Pouliot
Keyword(s):  
Cone Beam Ct ◽  
Ct Images ◽  
Cone Beam ◽  
Megavoltage Cone Beam Ct ◽  
The Impact

SU-FF-J-72: The Effect of MV Cone-Beam CT Cupping Artifacts On Dose Calculation Accuracy

2005 ◽  
Vol 32 (6Part5) ◽  
pp. 1936-1936 ◽  
Author(s):  
J Chen ◽  
O Morin ◽  
H Chen ◽  
M Aubin ◽  
J Pouliot
Keyword(s):  
Cone Beam Ct ◽  
Dose Calculation ◽  
Cone Beam ◽  
Cupping Artifacts

TH-D-ValA-05: Effect of Measured Cone-Beam CT-Density Calibration On Dose Calculations

2006 ◽  
Vol 33 (6Part23) ◽  
pp. 2286-2286 ◽  
Author(s):  
P Lindsay ◽  
X Zhu ◽  
L Zhang ◽  
R Wu ◽  
R Kudchadker ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Dose Calculations ◽  
Ct Density
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