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Un método sencillo para la reconstrucción en braquiterapia basado en los escanogramas de la TAC

A simple method for brachytherapy reconstruction based on the CT-scout views

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Abstract

En este trabajo se analiza un método de reconstrucción geométrica basado en los escanogramas de la TAC a utilizar en braquiterapia. Se describe asimismo el proceso de planificación que ha propiciado la introducción de dicho método.

Para los escanogramas correspondientes a 0o y 90o se han obtenido los respectivos focos virtuales mediante ajuste de datos medidos; se han establecido las relaciones por las cuales las coordenadas de un punto pueden obtenerse a partir de sus proyecciones y las posiciones de sus respectivos focos. La precisión global de la reconstrucción se ha estimado en 1 mm.

Se describe el proceso de planificación basado Únicamente en el uso de TAC en el que se ha introducido este método.

El método necesita solamente un sencillo conjunto de medidas, es compatible con el uso de aplicadores metálicos y permite el uso de la información de los cortes axiales de TAC con las consiguientes ventajas.

Abstract

A reconstruction method based on CT scout views to be implemented in the clinical routine is discussed. The planning procedure in which this method has been introduced is described.

The behaviour of the scout view images corresponding to 0 and 90‡ has been studied; measured data have been fitted to obtain the respective virtual focus positions; relationships are stated in which real point coordinates can be calculated from the intersection between lines joining the projections with their respective foci. The global accuracy of the reconstruction has been estimated to be within 1 mm. Scout views can be used to determine the position of the sources and traditional points of interest in Brachytherapy planning.

The method needs only a simple set of measurements and it is compatible with the use of metallic applicators. Information from the scout views and CT slices is coherent, and hence they can both be used together.

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Authors and Affiliations

  1. Servicio de Oncología Radioterápica, Hospital La Fe, Avda. Camponar, 21, 46009, Valencia

    José Pérez-Calatayud, Françoise Lliso Valverde, Vicente Carmona Meseguer, José Bea Gilabert, Alejandro Tormo Micó & M. Dolores Badal Iranzo

  2. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Valencia, Spain

    José Pérez-Calatayud, Françoise Lliso Valverde, Vicente Carmona Meseguer, José Bea Gilabert, Alejandro Tormo Micó & M. Dolores Badal Iranzo

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  1. José Pérez-Calatayud
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  2. Françoise Lliso Valverde
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  3. Vicente Carmona Meseguer
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  4. José Bea Gilabert
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  5. Alejandro Tormo Micó
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  6. M. Dolores Badal Iranzo
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Pérez-Calatayud, J., Valverde, F.L., Meseguer, V.C. et al. Un método sencillo para la reconstrucción en braquiterapia basado en los escanogramas de la TAC. Rev Oncología 2, 78–83 (2000). https://doi.org/10.1007/BF02979470

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