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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
2 Pt 1
|
| pubmed:dateCreated |
1993-6-24
|
| pubmed:abstractText |
A method for the calculation of three-dimensional dose distributions for high-energy photon beams is presented. The main features are (i) the calculation is fast enough to allow interactive three-dimensional treatment planning, and (ii) irregularly shaped or compensated fields, which are required to fit three-dimensional dose distributions to target volumes, are adequately taken into consideration. The method is based on the pencil beam convolution technique and shares its features concerning accuracy. A considerable gain in speed is achieved by decomposing the pencil beam kernel into three separated terms, thus reducing the required number of two-dimensional convolutions. The convolutions are performed in the frequency domain via the fast Hartley transform. Using these techniques, the calculation time for the convolutions is only about 8 s on a DEC VAX station 3100. This is one-fourth to one-third of the calculation time for the ray tracing through the three-dimensional CT data set, which has to be performed in any case. Results of the calculation are compared with measurements in a homogeneous phantom for 15 MV photons. Two irregular fields shaped with a multileaf collimator are considered. The deviations between measured and calculated absolute dose values are smaller than +/- 2%.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:issn |
0094-2405
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
20
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
311-8
|
| pubmed:dateRevised |
2004-11-17
|
| pubmed:meshHeading |
pubmed-meshheading:8497215-Algorithms,
pubmed-meshheading:8497215-Humans,
pubmed-meshheading:8497215-Image Processing, Computer-Assisted,
pubmed-meshheading:8497215-Radiotherapy, High-Energy,
pubmed-meshheading:8497215-Radiotherapy Dosage,
pubmed-meshheading:8497215-Radiotherapy Planning, Computer-Assisted,
pubmed-meshheading:8497215-Time Factors
|
| pubmed:articleTitle |
Decomposition of pencil beam kernels for fast dose calculations in three-dimensional treatment planning.
|
| pubmed:affiliation |
German Cancer Research Center, Department of Biophysics and Medical Radiation Physics, Heidelberg.
|
| pubmed:publicationType |
Journal Article
|