Linked Life Data

17917352

Source:http://linkedlifedata.com/resource/pubmed/id/17917352

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
2007-10-5
pubmed:abstractText
The present report describes the fabrication technique and dosimetry aspects of a desktop numerically controlled milling machine (NC-Mill) based a compensator system that uses lead clay (Shield cray, Reactor Experiments, Inc., U.S.A.). Effective path lengths of patients were determined for CT image sets using the ray-tracing technique and converted to compensator thickness with the equivalent TMR method. Rigid urethane foam was processed with the NC-Mill to produce a mold for filters, and the lead clay was adopted as the compensating material. The dose distribution was measured on the compensating plane of an anthropomorphic phantom and a stair-step PMMA phantom. It was found that the radiation field with inhomogeneous dose was as high as 30%+/-3% with the compensating filters. In addition, when the absorbed dose at the central axis of 52 compensating filters that were used clinically was measured, 75.0% showed an error of less than +/-3%, and 3.8% showed the maximum dose error: >+/-5%. Overall, the present system was capable of producing dose uniformity to within +/-5% for a stair-step phantom, an anthropomorphic phantom, and clinical situations.
pubmed:language
jpn
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0369-4305
pubmed:author
pubmed:issnType
Print
pubmed:day
20
pubmed:volume
63
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
877-87
pubmed:dateRevised
2011-7-28
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
[Evaluation of the accuracy of a compensating filter based on compact NC-Mill for radiation therapy].
pubmed:affiliation
Department of Radiology, Shinshu University Hospital.
pubmed:publicationType
Journal Article, English Abstract