نتایج جستجو برای: radiotherapy intensity modulated

تعداد نتایج: 290062  

2014
Xiaofeng Zhu Timothy Cullip Gregg Tracton Xiaoli Tang Jun Lian John Dooley Sha X Chang

Direct aperture optimization (DAO) has been used to produce high dosimetric quality intensity-modulated radiotherapy (IMRT) treatment plans with fast treatment delivery by directly modeling the multileaf collimator segment shapes and weights. To improve plan quality and reduce treatment time for our in-house treatment planning system, we implemented a new DAO approach without using a global obj...

Journal: :Translational Andrology and Urology 2018

2013
Stephen Steciw Satyapal Rathee Brad Warkentin

This work outlines the development of a robust method of calculating modulation factors used for the independent verification of MUs for IMRT and VMAT treatments, to replace onerous ion chamber measurements. Two-dimensional fluence maps were calculated for dynamic MLC fields that include MLC interleaf leakage, transmission, and tongue-and-groove effects, as characterized from EPID-acquired imag...

2010
Jean M. Moran

As the complexity of radiation therapy has increased, the need for quantitative dosimetric evaluation of treatment delivery has also increased. A growing number of investigations have expanded the use of EPIDs from anatomic applications to dosimetric verification. This work focuses on the applications of EPIDs for pre-treatment dosimetric verification of IMRT and intensity modulated arc therapy...

2014
James R Kerns Nathan Childress Stephen F Kry

BACKGROUND The multileaf collimator (MLC) is a critical component to accurate intensity-modulated radiotherapy (IMRT) delivery. This study examined MLC positional accuracy via MLC logs from Varian machines from six institutions and three delivery techniques to evaluate typical positional accuracy and treatment and mechanical parameters that affect accuracy. Typical accuracy achieved was compare...

2003
Nzhde Agazaryan Timothy D. Solberg John J. DeMarco

A patient specific quality assurance program has been developed to facilitate the clinical implementation of intensity modulated radiotherapy (IMRT) delivered using a micro-multileaf collimator. The methodology includes several dosimetric tasks that are performed prior to the treatment of each patient. Film dosimetry is performed for each individual field and for the multifield composite plan. ...

2010
Luciant D. Wolfsberger Matthew Wagar Paige Nitsch Mandar S. Bhagwat Piotr Zygmanski

One of the applications of MatriXX (IBA Dosimetry) is experimental verification of dose for IMRT, VMAT, and tomotherapy. For cumulative plan verification, dose is delivered for all the treatment gantry angles to a stationary detector. Experimental calibration of MatriXX detector recommended by the manufacturer involves only AP calibration fields and does not address angular dependency of MatriX...

Journal: :Head & neck 2004
Robert J Amdur Jonathan G Li Chihray Liu Russell W Hinerman William M Mendenhall

PURPOSE The purpose of this review is to address the issue of unnecessary irradiation of the normal larynx. METHODS We performed a literature review and dosimetry evaluation of intensity modulated radiotheraphy (IMRT) techniques. RESULTS Data suggest that matching conventional parallel opposed photon fields through adenopathy is a reasonable alternative to the common practice of unnecessari...

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