WE-E-M100F-03: Improving Soft Tissue Contrast in Megavoltage Cone-Beam CT Images for Adaptive Radiotherapy

2007 ◽  
Vol 34 (6Part21) ◽  
pp. 2607-2608
Author(s):  
B Reitz ◽  
O Gayou ◽  
M Johnson ◽  
D Parda ◽  
M Miften
Keyword(s):  
Soft Tissue ◽  
Cone Beam Ct ◽  
Ct Images ◽  
Adaptive Radiotherapy ◽  
Cone Beam ◽  
Soft Tissue Contrast ◽  
Tissue Contrast ◽  
Megavoltage Cone Beam Ct

Soft-tissue contrast resolution within the head of human cadaver by means of flat-detector-based cone-beam CT

2004 ◽  
Author(s):  
Jens Wiegert ◽  
Matthias Bertram ◽  
Dirk Schaefer ◽  
Norbert Conrads ◽  
Niels Noordhoek ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Human Cadaver ◽  
Flat Detector ◽  
Contrast Resolution ◽  
Soft Tissue Contrast ◽  
Tissue Contrast

Enhancement of soft-tissue contrast in cone-beam CT using an anti-scatter grid with a sparse sampling approach

2020 ◽  
Vol 70 ◽  
pp. 1-9 ◽  
Author(s):  
Sanghoon Cho ◽  
Sunho Lim ◽  
Changhwan Kim ◽  
Sunhee Wi ◽  
Taejin Kwon ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Cone Beam Ct ◽  
Sparse Sampling ◽  
Cone Beam ◽  
Soft Tissue Contrast ◽  
Tissue Contrast ◽  
Sampling Approach

A comparison of kilovoltage and megavoltage cone beam CT in radiotherapy

2007 ◽  
Vol 6 (03) ◽  
pp. 173-178 ◽  
Author(s):  
M. Broderick ◽  
G. Menezes ◽  
M. Leech ◽  
M. Coffey ◽  
R. Appleyard
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Hounsfield Units ◽  
Adaptive Planning ◽  
Tissue Contrast ◽  
Cross Calibration ◽  
Conventional Ct ◽  
Megavoltage Cone Beam Ct

AbstractAs more and more patients are planned in 3D, the need to verify their position and treatment in 3D also becomes apparent. Megavoltage (MV) and kilovoltage (KV) cone beam computed tomography (CBCT) provide 3D verification of patient position. However, the soft tissue contrast and thus the accuracy of delineation is superior with KV CT imaging. CBCT in conjunction with energy fluence maps from electronic portal imaging devices (EPIDs) could theoretically be used to verify the dose delivered. In this instance, a cross calibration between the KV CBCT and the EPID would be required which would not be necessary with MV CBCT. Adaptive planning with CBCT poses similar challenges for both KV and MV CBCT. Although KV CBCT can produce images with Hounsfield units (HUs) comparable with conventional CT in homogenous phantoms there are large discrepancies in inhomogeneous mediums. If the cupping artefact is corrected for in MV CBCT, the HU values can compare well with KV CBCT for homogenous media. However, advances need to be made to achieve a lower patient dose with MV CBCT. At present, the lower dose required for KV CBCT allows for more frequent imaging and better image quality.

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-I-20: Dose Calculation On Megavoltage Cone-Beam CT Images Corrected for Cupping and Missing Data Artifacts

2007 ◽  
Vol 34 (6Part2) ◽  
pp. 2342-2342
Author(s):  
J Aubry ◽  
O Morin ◽  
B Faddegon ◽  
C Nunna ◽  
L Beaulieu ◽  
...  
Keyword(s):  
Missing Data ◽  
Cone Beam Ct ◽  
Dose Calculation ◽  
Ct Images ◽  
Cone Beam ◽  
Megavoltage Cone Beam Ct
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