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Titolo:
Calculation of mean central dose in interstitial brachytherapy using Delaunay triangulation
Autore:
Astrahan, MA; Streeter, OE; Jozsef, G;
Indirizzi:
Univ So Calif, Kenneth Norris Jr Comprehens Canc Ctr, Dept Radiat Oncol, Los Angeles, CA 90033 USA Univ So Calif Los Angeles CA USA 90033 t Oncol, Los Angeles, CA 90033 USA
Titolo Testata:
MEDICAL PHYSICS
fascicolo: 6, volume: 28, anno: 2001,
pagine: 1016 - 1023
SICI:
0094-2405(200106)28:6<1016:COMCDI>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Keywords:
brachytherapy dosimetry; mean central dose; Delaunay triangulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Astrahan, MA Univ So Calif, Kenneth Norris Jr Comprehens Canc Ctr, Dept Radiat Oncol, 1441 Eastlake Ave, Los Angeles, CA 90033 USA Univ So Calif 1441Eastlake Ave Los Angeles CA USA 90033 USA
Citazione:
M.A. Astrahan et al., "Calculation of mean central dose in interstitial brachytherapy using Delaunay triangulation", MED PHYS, 28(6), 2001, pp. 1016-1023

Abstract

In 1997 the ICRU published Report 58 "Dose and Volume Specification for Reporting Interstitial Therapy" with the objective of addressing the problem of absorbed dose specification for reporting contemporary interstitial therapy. One of the concepts proposed in that report is "mean central dose. " The fundamental goal of the mean central dose (MCD) calculation is to obtain a single, readily reportable and intercomparable value which is representative of dose in regions of the implant "where the dose gradient approximatesa plateau. " Delaunay triangulation (DT) is a method used in computational geometry to partition the space enclosed by the convex hull of a set of distinct points P into a set of nonoverlapping cells. In the three-dimensionalcase, each point of P becomes a vertex of a tetrahedron and the result of the DT is a set of tetrahedra. All treatment planning for interstitial brachytherapy inherently requires that the location of the radioactive sources,or dwell positions in the case of HDR, be known or digitized. These sourerlocations may be regarded as a set of points representing the implanted volume. Delaunay triangulation of the source locations creates a set of tetrahedra without manual intervention. The geometric centers of these tetrahedra define a new set of points which lie "in between" the radioactive sourcesand which are distributed uniformly over the volume of the implant. The arithmetic mean of the dose at these centers is a three dimensional analog ofthe two-dimensional triangulation and inspection methods proposed for calculating MCD in ICRU 58. We demonstrate that DT can be successfully incorporated into a computerized treatment planning system and used to calculate the MCD. (C) 2001 American Association of Physicists in Medicine.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 01:22:08