Methods and materials: Whole body imaging (WBI) or partial body imaging (PBI) was performed using pretreatment megavoltage computed tomography (MVCT) in a helical Tomotherapy machine. (unipg.it)
Rigid registration of MVCT and planning kilovoltage computed tomography images were performed to measure setup error and its effect on dose distribution. (unipg.it)
To analyze setup deviations using daily megavoltage computed tomography (MVCT) and to evaluate three MVCT frequency reducing protocols for gynecologic cancer patients treated with helical tomotherapy. (biomedcentral.com)
To determine the variability of patient positioning errors associated with intensity-modulated radiotherapy (IMRT) for prostate cancer and to assess the impact of thermoplastic pelvic immobilization on these errors using kilovoltage (kV) cone-beam computed tomography (CBCT). (springer.com)
Radiotherapy4
Significant radiosensitisation (~67 %) of control was also noted in cells at megavoltage energies (commonly used in radiotherapy), compared to negligible levels detected by phantoms. (medsci.org)
2013. " Workflow Automation For Ultrafast Kilovoltage-Megavoltage Cone-Beam Ct For Image Guided Radiotherapy " . (uni-heidelberg.de)
2010. " Fast Kilovoltage/megavoltage (Kvmv) Breathhold Cone-Beam Ct For Image-Guided Radiotherapy Of Lung Cancer. " . (uni-heidelberg.de)
This paper evaluate the functionality of a designed small phantom for determining the accuracy and performance of megavoltage radiotherapy machines through an external quality audit. (nstri.ir)
CBCT4
Kilovoltage CBCT has the benefits of increased tissue contrast and resolution (to sub-millimetre). (wikidot.com)
Megavoltage CBCT has poorer contrast but has less problems with high-Z artefact seen with kilovoltage imaging. (wikidot.com)
The goal is to develop large area photon counting backplanes that will significantly enhance the information content obtained from CBCT imaging for breast CT (BCT) and from kilovoltage CBCT imaging for radiation therapy (kV-CBCT). (umich.edu)
This would also improve kV-CBCT imaging (which offers superior soft-tissue contrast compared to portal imaging with the megavoltage treatment beam) to improve the geometric precision of radiation therapy. (umich.edu)
Energies3
Although original plans were to include kilovoltage CT imaging, current models use megavoltage energies. (wikipedia.org)
Comparable levels of radiosensitisation were observed in both phantoms and cells at kilovoltage ranges of x-ray energies (slightly higher in vitro) . (medsci.org)
These CT images are typically acquired at kilovoltage X-ray energies resulting in excellent soft tissue definition, which means you can distinguish tumor from muscle, fat, or other organs. (varian.com)
Tomotherapy1
Modern tomotherapy and conventional linac systems incorporate one or both of megavoltage X-ray or kilovoltage X-ray imaging systems, enabling image-guided radiation therapy (IMRT). (wikipedia.org)
Beams1
The depth doses for kilovoltage and megavoltage x-ray beams have also modelled using Monte Carlo code. (edu.au)
Imaging8
However, megavoltage imaging also has significant disadvantages. (varian.com)
2008. " Fast On-Board Imaging Based On Combined Kilovoltage Megavoltage Cone-Beam Reconstruction Manuel Blessing And Dzmitry Stsepankou And Frank Lohr And Jã¼Rgen Hesser And Frederik Wenz " . (uni-heidelberg.de)
Modern linear accelerators have a kilovoltage on board imaging (OBI) device. (wikidot.com)
Kilovoltage imaging gives much better discrimination between bone and soft tissue and assists with patient positioning. (wikidot.com)
Kilovoltage images can perform fluoroscopic imaging to detect organ motion. (wikidot.com)
One solution to clinical scenarios in which improved soft-tissue targeting is desired was the introduction of in-room kilovoltage (kV) imaging systems. (aapm.org)
The objective of this proposal is the development of a """"""""Kinaesthetic Charge Detection (KCD)"""""""" system for megavoltage portal imaging. (grantome.com)
Preliminary results from a small field of view (FOV) research prototype support the hypothesis that, as compared to currently available commercial portal imaging systems: conventional portal imaging and electronic portal imaging devices (EPIDs), the megavoltage KCD system provides images superior in contrast and comparable in resolution, while delivering a small fraction of the dose to the patient. (grantome.com)
Detection1
As part of the project, researchers from Varian and Stanford will develop new megavoltage X-ray detection hardware and image reconstruction software, and will validate the new technology in a clinical trial to be conducted by Stanford. (varian.com)
Commonly1
In particular, IGRT has been most commonly facilitated using X-rays, beginning with use of megavoltage (MV) portal and/or orthogonal setup images some decades ago. (aapm.org)
Images1
A small megavoltage x-ray source was mounted in a similar fashion to a CT x-ray source, and the geometry provided the opportunity to provide CT images of the body in the treatment setup position. (wikipedia.org)
Dose1
Now that megavoltage modalities are being considered more often, dose rates from x-ray machines and radioactive material at 0.4-2.5 Gy min -1 may now be escalated to pulsed dose rates at 4-10 Gy min -1 from accelerators (Stuben 1994). (experts.com)
Source1
A digital x-ray detecting device is mounted opposite the kilovoltage source. (wikidot.com)
Machines1
1995). Almost all radiobiological experiments have been performed with kilovoltage x-ray machines. (experts.com)
Target2
2010. " Breath-Hold Target Localization With Simultaneous Kilovoltage/megavoltage Cone-Beam Ct And Fast Reconstruction " . (uni-heidelberg.de)
The former are generated by megavoltage x-rays, while the latter, used for target localization, are produced by kilovoltage x-rays. (grantome.com)
Resolution1
Our research grant will be used to develop tools to achieve the best of both worlds by combining kilovoltage cone-beam CT data with a limited amount of megavoltage data to create a composite image with less distortion and good soft tissue resolution. (varian.com)
Radiotherapy3
2013. " Workflow Automation For Ultrafast Kilovoltage-Megavoltage Cone-Beam Ct For Image Guided Radiotherapy " . (uni-heidelberg.de)
2018. " Finalized Implementation Of Ultrafast Kilovoltage-Megavoltage Cbct For Image Guided Radiotherapy Of Lung Cancer: System Description And Real-Time Results. " . (uni-heidelberg.de)
Ang mga therapeutic procedure na kinasasangkutan ng ionizing radiation ay kadalasang gumagamit ng high-energy megavoltage x-ray at γ-ray o megavoltage electron (radiotherapy na kilala rin bilang radiation therapy, radiation oncology, at therapeutic radiology). (idealmedhealth.com)
Beam5
[ 68 ] Cone-beam CT (CBCT) imaging is an example of kilovoltage imaging technology. (medscape.com)
2010. " Breath-Hold Target Localization With Simultaneous Kilovoltage/megavoltage Cone-Beam Ct And Fast Reconstruction " . (uni-heidelberg.de)
2014. " Matching Accuracy Of Ultrafast Kilovoltage-Megavoltage (Kv-Mv) Cone Beam Ct For Image Guided Radiation Therapy " . (uni-heidelberg.de)
Both kilo- and megavoltage beam treatments were modelled, the latter to be used as a reference. (xstrahl.com)
Purpose: To assess clinically relevant image quality metrics (IQMs) of helical fan beam kilovoltage (kV) fan beam computed tomography (CT). (elsevierpure.com)
Radiation2
Modern tomotherapy and conventional linac systems incorporate one or both of megavoltage X-ray or kilovoltage X-ray imaging systems, enabling image-guided radiation therapy (IMRT). (wikipedia.org)
Image acquisition occurs in the radiation treatment unit room employing either megavoltage or kilovoltage imaging. (medscape.com)
Treatment4
A small megavoltage x-ray source was mounted in a similar fashion to a CT x-ray source, and the geometry provided the opportunity to provide CT images of the body in the treatment setup position. (wikipedia.org)
While for the ipsilateral healthy breast tissue the megavoltage treatment does offer an advantage in terms of less volume irradiated to intermediate doses, for the contralateral structures, breast and lung, the low penetration ability of the kilovoltage treatment results in a lower maximum dose. (xstrahl.com)
Skin dose is higher for the kilovoltage treatment but still well within the tolerance limits reported in the clinical trial. (xstrahl.com)
Kabilang dito ang mga linear accelerator system at kilovoltage x-ray treatment unit sa araw-araw, gayundin ang iba pang modalidad gaya ng TomoTherapy, at gamma knife. (idealmedhealth.com)