Control apparatus for controlling radiotherapy irradiation system
First Claim
1. A control apparatus for controlling a radiotherapy irradiation system, comprising:
- an initial solution setting means for setting an initial solution indicating an initial irradiated beam weight;
restriction input means for inputting restrictions according to a prescription;
evaluation function setting means for setting an evaluation function under the restrictions;
iterative calculation means for iteratively calculating the evaluation function until the evaluation function is minimized and determining an irradiated beam weight optimizing irradiation; and
optimal solution output means for outputting an optimal solution indicating an optimal beam weight to the irradiation system, wherein after the restrictions are modified, when setting an evaluation function under modified restrictions and determining an irradiated beam weight for optimizing irradiation, said initial solution setting means adopts the optimal solution indicating an optimal irradiated beam weight, obtained before the restrictions are modified, as an initial solution indicating the initial irradiated beam weight.
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Abstract
A control apparatus for a radiotherapy irradiation system in which a calculation time required for calculation to be performed after restrictions are modified is shortened. The control apparatus includes a unit for setting an initial solution indicating an initial irradiated beam weight, a unit for inputting restrictions according to a prescription, and a unit for setting an evaluation function under the restrictions. The control apparatus further includes a unit for iteratively calculating the evaluation function until the evaluation function is minimized and determining an irradiated beam weight optimizing irradiation, and unit for outputting an optimal solution indicating an optimal irradiated beam weight to the irradiation system. After restrictions are modified, a new evaluation function is set under the modified restrictions. An irradiated beam weight is then determined for optimizing irradiation. At this time, the initial solution setting unit adopts the previous optimal solution indicating an optimal irradiated beam weight, which is obtained before the restrictions are modified, as the initial solution indicating the initial irradiated beam weight.
55 Citations
11 Claims
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1. A control apparatus for controlling a radiotherapy irradiation system, comprising:
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an initial solution setting means for setting an initial solution indicating an initial irradiated beam weight;
restriction input means for inputting restrictions according to a prescription;
evaluation function setting means for setting an evaluation function under the restrictions;
iterative calculation means for iteratively calculating the evaluation function until the evaluation function is minimized and determining an irradiated beam weight optimizing irradiation; and
optimal solution output means for outputting an optimal solution indicating an optimal beam weight to the irradiation system, wherein after the restrictions are modified, when setting an evaluation function under modified restrictions and determining an irradiated beam weight for optimizing irradiation, said initial solution setting means adopts the optimal solution indicating an optimal irradiated beam weight, obtained before the restrictions are modified, as an initial solution indicating the initial irradiated beam weight. - View Dependent Claims (2)
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3. A control apparatus for controlling a radiotherapy irradiation system, comprising:
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an initial solution setting means for setting an initial solution indicating an initial irradiated beam weight;
restriction input means for inputting restrictions according to a prescription;
evaluation function setting means for setting an evaluation function under the restrictions;
iterative calculation means for iteratively calculating the evaluation function until the evaluation function is minimized and determining an irradiated beam weight optimizing irradiation;
an optimal solution output means for outputting an optimal solution indicating an optimal irradiated beam weight to the irradiation system; and
restriction modifying means for judging from a dose distribution, which expresses or distribution of doses in relation to the optimal irradiated beam weight, whether the restrictions are satisfied relative to each human tissue, automatically modifying the restrictions when the restrictions are found unsatisfied relative to a human tissue, and instructing optimization of irradiation. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A control apparatus for controlling a radiotherapy irradiation system, comprising:
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initial solution setting means for setting an initial solution indicating an initial irradiated beam weight;
restriction input means for inputting restrictions according to a prescription;
evaluation function setting means for setting an evaluation function under the restrictions;
iterative calculation means for iteratively calculating the evaluation function until the evaluation function is minimized and determining an optimal irradiated beam weight optimizing irradiation; and
optimal solution output means for outputting an optimal solution indicating an optimal irradiated beam weight to said irradiation system, wherein a restriction weight ri (i=0, 1, . . . ,n) to be input as one of the restrictions for each human tissue is divided by volume Vi of the human tissue, and regarded as a new restriction weight in order to calculate the evaluation function, where i=0 refers to a tumor while each of i=1, . . . ,n refers to respective normal organs at risk.
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Specification