Positional dependence of the CT number with use of a cone-beam CT scanner for an electron density phantom in particle beam therapy

2012 ◽  
Vol 6 (1) ◽  
pp. 241-247 ◽  
Author(s):  
Yohsuke Kusano ◽  
Saki Uesaka ◽  
Kaori Yajima ◽  
Motoki Kumagai ◽  
Hideyuki Mizuno ◽  
...  
Keyword(s):  
Electron Density ◽  
Cone Beam Ct ◽  
Particle Beam ◽  
Cone Beam ◽  
Ct Scanner ◽  
Ct Number ◽  
Particle Beam Therapy

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.

TU-D-AUD-06: Cone Beam CT Number Correction Method for Accurate EBRT Dose Calculations

2007 ◽  
Vol 34 (6Part18) ◽  
pp. 2558-2558
Author(s):  
B Liu ◽  
F Lerma
Keyword(s):  
Cone Beam Ct ◽  
Correction Method ◽  
Cone Beam ◽  
Dose Calculations ◽  
Ct Number

WE-D-BRB-06: A Novel Phantom for Electron Density Calibration of Linac Cone Beam CT Options

2010 ◽  
Vol 37 (6Part28) ◽  
pp. 3428-3428
Author(s):  
P Cossmann
Keyword(s):  
Electron Density ◽  
Cone Beam Ct ◽  
Cone Beam

Technical assessment of a cone-beam CT scanner for otolaryngology imaging: Image quality, dose, and technique protocols

2012 ◽  
Vol 39 (8) ◽  
pp. 4932-4942 ◽  
Author(s):  
J. Xu ◽  
D. D. Reh ◽  
J. P. Carey ◽  
M. Mahesh ◽  
J. H. Siewerdsen
Keyword(s):  
Image Quality ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Ct Scanner ◽  
Technical Assessment

A cone beam CT scanner without moving parts

2008 ◽  
Author(s):  
Hermann Schomberg ◽  
Randy Luhta ◽  
Rainer Pietig
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Ct Scanner ◽  
Moving Parts
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