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Titolo:
2 ACCURATE ALGORITHMS FOR CALCULATING THE ENERGY FLUENCE PROFILE IN INVERSE RADIATION-THERAPY PLANNING
Autore:
LIU S; LIND BK; BRAHME A;
Indirizzi:
KAROLINSKA INST,DEPT MED RADIAT PHYS,POB 260 S-17177 STOCKHOLM SWEDEN
Titolo Testata:
Physics in medicine and biology
fascicolo: 12, volume: 38, anno: 1993,
pagine: 1809 - 1824
SICI:
0031-9155(1993)38:12<1809:2AAFCT>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
ROTATION THERAPY; OPTIMIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
S. Liu et al., "2 ACCURATE ALGORITHMS FOR CALCULATING THE ENERGY FLUENCE PROFILE IN INVERSE RADIATION-THERAPY PLANNING", Physics in medicine and biology, 38(12), 1993, pp. 1809-1824

Abstract

Two accurate algorithms for calculating the required incident energy fluence distributions from the optimal irradiation density distribution in inverse radiation therapy planning have been developed. The algorithms are characterized by a high speed and accuracy and an ability tohandle both divergent and parallel beams even for extremely heterogeneous target volumes. The fastest algorithm is based on a longitudinal distance weighting method, whereas the slower but more acurate algorithm uses an area weighting method which has the advantage that it also works very well at low spatial resolutions. Both algorithms have been inverted for forward calculation of the delivered absorbed dose distribution from known fluence profiles. This is essential for the validation of the resultant dose distributions since the projected irradiationdensity has been determined from dose distributions calculated with convolution methods. A shortcoming of the longitudinal distance weighting algorithm for forward calculation is that it requires a higher spatial resolution in the energy fluence to minimize the discretization noise caused by interpolation. The area weighting algorithm on the otherhand requires a longer calculation time. When the forward calculationtime is also taken into account, the more accurate area weighting method is the most advantageous algorithm from the point of view of totalcalculation time.

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Documento generato il 02/12/20 alle ore 15:26:45