| Independent verification using portal imaging of intensity-modulated beam delivery by the dynamic MLC technique. | |
| | |
MedLine Citation:
|
PMID: 9800694 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The use of intensity-modulated radiation fields in radiotherapy treatment has been shown to have the potential to deliver highly conformal dose distributions. One technique for delivering these intensity-modulated beams is a computerized dynamic multileaf collimator (MLC). A major current impediment to the development of dynamic MLC therapy is verification of these highly complex treatments. Electronic portal imaging is shown here to be a solution to this verification problem. Experimental results are presented showing that leaf penumbra measured with a portal imager can be used to accurately define the positions of moving leaves. The random error in these leaf positions is compared with mean leaf positions along each leaf bank and specified leaf positions at prescription control points to check mechanical performance. Individual leaves are also checked for systematic motion errors. All leaf positions are found to be well within the manufacturer's specifications at all times. Finally, integral intensity images are presented that can be related to the dose distribution delivered. Portal imaging is shown to have the potential to become a valuable tool for the verification of dynamic MLC irradiation. |
| | |
Authors:
|
M Partridge; P M Evans; A Mosleh-Shirazi; D Convery |
Related Documents
:
|
12876024 - Mr renography using a dynamic gradient-echo sequence and low-dose gadopentetate dimeglu... 3511634 - Incremental dynamic computed tomography: practical method of imaging the carotid bifurc... 9187564 - Left ventricular hypertrophic patterns and wall motion dynamics in hypertrophic cardiom... 9709564 - Mandible position and head posture: electromyography of sternocleidomastoids. 22522814 - Angular versus spatial resolution trade-offs for diffusion imaging under time constraints. 21337404 - Multiecho coarse voxel acquisition for neurofeedback fmri. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Medical physics Volume: 25 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 1998 Oct |
Date Detail:
|
Created Date: 1999-01-19 Completed Date: 1999-01-19 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 0425746 Medline TA: Med Phys Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 1872-9 Citation Subset: IM |
Affiliation:
|
Joint Department of Physics, Royal Marsden NHS Trust, Sutton, United Kingdom. mikep@icr.ac.uk |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Biophysical Phenomena Biophysics Humans Models, Theoretical Neoplasms / radiotherapy Particle Accelerators Radiotherapy Planning, Computer-Assisted / methods*, statistics & numerical data Radiotherapy, High-Energy / methods, statistics & numerical data |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: The regional Monte Carlo method: a dose calculation method based on accuracy requirement.
Next Document: Optimization of the scintillation detector in a combined 3D megavoltage CT scanner and portal imager...