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Titolo: THE APPLICATION OF CORRELATED SAMPLING TO THE COMPUTATION OF ELECTRONBEAM DOSE DISTRIBUTIONS IN HETEROGENEOUS PHANTOMS USING THE MONTECARLO METHOD
Autore: HOLMES MA; MACKIE TR; SOHN W; RECKWERDT PJ; KINSELLA TJ; BIELAJEW AF; ROGERS DWO;
 Indirizzi:
 UNIV WISCONSIN,SCH MED MADISON WI 53706 NATL RES COUNCIL CANADA OTTAWA K1A 0R6 ONTARIO CANADA
 Titolo Testata:
 Physics in medicine and biology
fascicolo: 6,
volume: 38,
anno: 1993,
pagine: 675  688
 SICI:
 00319155(1993)38:6<675:TAOCST>2.0.ZU;29
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 STOPPINGPOWER RATIOS; ENERGY;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 11
 Recensione:
 Indirizzi per estratti:



 Citazione:
 M.A. Holmes et al., "THE APPLICATION OF CORRELATED SAMPLING TO THE COMPUTATION OF ELECTRONBEAM DOSE DISTRIBUTIONS IN HETEROGENEOUS PHANTOMS USING THE MONTECARLO METHOD", Physics in medicine and biology, 38(6), 1993, pp. 675688
Abstract
Although the Monte Carlo method is capable of computing the dose distribution in heterogeneous phantoms directly, there am some advantages to computing a heterogeneity correction factor. If this approach is adopted there are savings in time using correlated sampling. This technique forces histories to have the same energy, position, direction and random number seed as incident on both the heterogeneous and homogeneous water phantom. This ensures that a history that has, by chance, travelled through only water in the heterogeneous phantom will have the same path as it would have through the homogeneous phantom, resulting in a reduced variance when a ratio of heterogeneous dose to homogeneousdose is formed. Metrics to describe the distributions of uncertainty,efficiency, and degree of correlation am defined. EGS4 Monte Carlo calculation of the dose distribution from a 20 MeV electron beam on water phantoms containing aluminium or air slab heterogeneities illustratethat this technique is the most efficient when the heterogeneity is deep within the phantom, but that improved efficiency can be realized even when the heterogeneity is at or near the surface. This is because some correlation between the two histories is retained despite passagethrough the heterogeneity.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:26:35