[A way to spatial irradiation planning. II. Vectorial demonstration of spatial dose distribution within a single-ray beam and 1st consequences for the practice].

Spatial irradiation planning among other things demands spatial consideration of the dose distribution within the single useful ray beam. From this point of view, the vectorial dose quantities introduced in part I of this paper are reviewed, their correlations are examined as well as their dependences on different influencing quantities e.g. on the rotational position of the wedge filter with the central ray as an axis of rotation. The vectorial description of dose distribution used in this paper, additionally offers information on the total effect upon the inclination of isodose surfaces or curves respectively, caused either simultaneously by different influences (simultaneous effect) or in temporal succession by separate influences (succession effect). The correlations observed can be verified diagrammatically or dosimetrically using simple practical examples. Thus, it is possible for instance to obtain a continuous defined variation of the isodose inclination by varying the weights of the partial doses with successive irradiation with or without a wedge filter.