Technical note: TERMA scaling as an effective heterogeneity correction model for convolution-based external-beam photon dose calculations.
Med Phys
; 50(5): 3191-3198, 2023 May.
Article
en En
| MEDLINE
| ID: mdl-36738126
ABSTRACT
BACKGROUND:
In highly heterogeneous medium, such as one with lung tissue or air cavities, the dose in the low-density region or after it, as calculated by the conventional methods based on convolution with an energy-spreading kernel, is usually overestimated in comparison with measurements or more accurate predictions.PURPOSE:
To correct the overestimation, we propose a method of scaling the total energy released per mass (TERMA).METHODS:
The scaling depends on both the density distribution and the effective beam size in the lateral direction.RESULTS:
The corrected convolution method achieved a significantly improved accuracy in both the lung-like tissue and the water-like region after air, compared to the uncorrected method. The TERMA correction only adds about 10% to the overall computational cost.CONCLUSIONS:
Due to the improvement in accuracy and the preservation of computational efficiency, the proposed dose calculation method will be valuable for inverse treatment planning.Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Planificación de la Radioterapia Asistida por Computador
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Fotones
Tipo de estudio:
Health_economic_evaluation
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Prognostic_studies
Idioma:
En
Revista:
Med Phys
Año:
2023
Tipo del documento:
Article
País de afiliación:
Finlandia