TH-D-210A-01: Exploration of Soft-Tissue Visualization at Low Dose Using Flat-Panel Imagers Incorporating Thick, Segmented Scintillators for Megavoltage Cone-Beam CT

2009 ◽  
Vol 36 (6Part28) ◽  
pp. 2818-2818
Author(s):  
Y El-Mohri ◽  
L Antonuk ◽  
Q Zhao ◽  
Y Wang ◽  
H Du ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Low Dose ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Flat Panel ◽  
Flat Panel Imagers ◽  
Megavoltage Cone Beam Ct

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

Low-dose megavoltage cone-beam CT for radiation therapy

2005 ◽  
Vol 61 (2) ◽  
pp. 552-560 ◽  
Author(s):  
Jean Pouliot ◽  
Ali Bani-Hashemi ◽  
Josephine Chen ◽  
Michelle Svatos ◽  
Farhad Ghelmansarai ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Low Dose ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Megavoltage Cone Beam Ct

TH-E-330A-06: Scatter Characterization in Cone-Beam CT Systems with Offset Flat Panel Imagers

2006 ◽  
Vol 33 (6Part23) ◽  
pp. 2288-2288 ◽  
Author(s):  
G Virshup ◽  
R Suri ◽  
J Star-Lack
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Flat Panel ◽  
Flat Panel Imagers

Flat Panel Cone Beam Computed Tomography of the Sinuses

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P77-P78
Author(s):  
Richard A Zoumalan ◽  
Kathryn Shouyee Yung ◽  
Edwin Wang ◽  
Richard A Lebowitz ◽  
Joseph B Jacobs
Keyword(s):  
Image Quality ◽  
Ct Scan ◽  
Low Dose ◽  
Multidetector Ct ◽  
Imaging Modality ◽  
Cone Beam Ct ◽  
Image Noise ◽  
Cone Beam ◽  
High Dose ◽  
Flat Panel

Objective Flat panel cone beam CT is a relatively new technology that improves upon traditional multidetector CT scanners by generating images with greater spatial resolution at lower radiation doses. 1) Learn whether flat panel cone beam CT evaluation is an effective imaging modality for the sinuses. 2) Learn which doses of radiation provide quality evaluation of the sinuses while exposing the patient to the least amount of radiation. Methods In 2007, a panel consisting of neuroradiologists and otolaryngologists blindly reviewed images from flat panel sinus CTs (Xoran MiniCAT) of 11 live human subjects, each irradiated at all 3 different techniques (denoted as: low dose mAs=9.27, medium dose mAs = 18.41, high dose mAs=36.7) and rated the image quality of a pre-designated list of sinus anatomic structures. Techniques were compared in a pairwise manner using a Wilcoxon matched-pairs signed ranks test. Results Compared to the low dose technique CT scan, the high dose CT scan technique had significantly better image quality (P=.0029) and image noise (P=.0049). Similarly, the medium dose CT scan technique had significantly better image quality (P=.0020) and image noise (P = .0010) compared to the low dose technique. No difference in image quality and image noise existed between the medium and high dose techniques. No difference in visualization of 13 specific anatomic structures existed between any of the dose techniques. Conclusions Lower dose CT techniques achieved by flat panel cone beam CT may be an effective and safe alternative to traditional multidetector CT scanners. This imaging modality may help patients avoid unnecessary radiation to sensitive organs.

Low-dose megavoltage cone-beam CT for dose-guided radiation therapy

2003 ◽  
Vol 57 (2) ◽  
pp. S183-S184 ◽  
Author(s):  
J Pouliot ◽  
P Xia ◽  
M Aubin ◽  
L Verhey ◽  
A Bani-Hashemi ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Low Dose ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Megavoltage Cone Beam Ct

scholarly journals Low-dose megavoltage cone-beam CT imaging using thick, segmented scintillators

2011 ◽  
Vol 56 (6) ◽  
pp. 1509-1527 ◽  
Author(s):  
Youcef El-Mohri ◽  
Larry E Antonuk ◽  
Qihua Zhao ◽  
Richard B Choroszucha ◽  
Hao Jiang ◽  
...  
Keyword(s):  
Low Dose ◽  
Cone Beam Ct ◽  
Ct Imaging ◽  
Cone Beam ◽  
Megavoltage Cone Beam Ct

Soft tissue visualization using a highly efficient megavoltage cone beam CT imaging system

2005 ◽  
Author(s):  
Farhad A. Ghelmansarai ◽  
Ali Bani-Hashemi ◽  
Jean Pouliot ◽  
Ed Calderon ◽  
Paco Hernandez ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Imaging System ◽  
Cone Beam Ct ◽  
Ct Imaging ◽  
Cone Beam ◽  
Highly Efficient ◽  
Megavoltage Cone Beam Ct

scholarly journals Soft-tissue imaging in low-dose, C-arm cone-beam CT using statistical image reconstruction

2013 ◽  
Author(s):  
Adam S. Wang ◽  
Sebastian Schafer ◽  
J. W. Stayman ◽  
Yoshi Otake ◽  
Marc S. Sussman ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Image Reconstruction ◽  
Low Dose ◽  
Cone Beam Ct ◽  
Tissue Imaging ◽  
Cone Beam ◽  
Statistical Image Reconstruction

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.

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