Patent Number: 
Section: claims

1. A radiation therapy treatment planning machine for use with a multileaf collimator, said machine comprising:a Multileaf-Collimator-Position-Calculation-Unit that generates multileaf collimator leaf positions as a time series;a Motion-Speed-Calculating-Unit that calculates leaf motion speed based on the generated time series leaf positions;a Motion-Speed-Limit-Establishing-Unit that establishes a motion speed limit of the leaves; anda Motion-Display-Unit that indicates leaf motion information and indicates the motion information of an area where the calculated motion speed exceeds the established motion speed limit. 2. The radiation therapy treatment planning machine according to claim 1, wherein said Motion-Speed-Limit-Establishing-Unit comprises a Motion-Speed-Limit-Inputting-Unit that inputs a motion speed limit of the leaves as the established motion speed limit. 3. The radiation therapy treatment planning machine according to claim 2, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the time series leaf positions generated by said Multileaf-Collimator-Position-Calculation-Unit; anda Motion-Acceleration-Limit-Inputting-Unit that inputs a motion acceleration limit of the leaves,wherein said Motion-Display-Unit indicates the motion information of an area where the calculated motion acceleration exceeds the inputted acceleration limit. 4. The radiation therapy treatment planning machine according to claim 1, wherein said Motion-Speed-Limit-Establishing-Unit comprises a Motion-Speed-Limit-Setting-Unit that sets a predetermined motion speed limit of the leaves as the established motion speed limit. 5. The radiation therapy treatment planning machine according to claim 4, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the time series leaf positions generated by said Multileaf-Collimator-Position-Calculation-Unit; anda Motion-Acceleration-Limit-Setting-Unit that sets a predetermined motion acceleration limit of the leaves,wherein said Motion-Display-Unit indicates the motion information of an area where the calculated motion acceleration exceeds the predetermined set acceleration limit. 6. The radiation therapy treatment planning machine according to claim 1, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the time series leaf positions generated by said Multileaf-Collimator-Position-Calculation-Unit,wherein said Motion-Display-Unit indicates the motion information of an area where the calculated motion acceleration exceeds a motion acceleration limit. 7. A radiation therapy treatment planning machine for use with a multileaf collimator, said machine comprising:a Multileaf-Collimator-Position-Calculation-Unit that generates multileaf collimator leaf positions as a time series;a Motion-Speed-Calculating-Unit that calculates leaf motion speed based on the generated time series leaf positions;a Motion-Speed-Limit-Establishing-Unit that establishes a motion speed limit of the leaves; anda Leaf-Position-Correction-Unit that corrects the leaf positions of an area, where the calculated motion speed exceeds the established motion speed limit, such that the leaf motion speed is equal to or less than the established motion speed limit. 8. The radiation therapy treatment planning machine according to claim 7, wherein said Motion-Speed-Limit-Establishing-Unit comprises a Motion-Speed-Limit-Inputting-Unit that inputs a motion speed limit of the leaves as the established motion speed limit. 9. The radiation therapy treatment planning machine according to claim 8, wherein the leaf positions are corrected toward a direction to widen the radiation field shape when said Leaf-Position-Correction-Unit corrects the leaf positions of an area where the calculated motion speed exceeds the inputted motion speed limit such that the leaf motion speed is equal to or less than the inputted motion speed limit. 10. The radiation therapy treatment planning machine according to claim 9, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the leaf positions corrected by said Leaf-Position-Correction-Unit; anda Motion-Acceleration-Limit-Inputting-Unit that inputs a motion acceleration limit of the leaves,wherein said Leaf-Position-Correction-Unit corrects the leaf positions of an area, where the calculated motion acceleration exceeds the inputted acceleration limit, such that the leaf motion acceleration is equal to or less than the inputted acceleration limit. 11. The radiation therapy treatment planning machine according to claim 8, wherein the leaf positions are corrected toward a direction to narrow the radiation field shape when said Leaf-Position-Correction-Unit corrects the leaf positions of an area where the calculated motion speed exceeds the inputted motion speed limit such that the leaf motion speed is equal to or less than the inputted motion speed limit. 12. The radiation therapy treatment planning machine according to claim 11, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the leaf positions corrected by said Leaf-Position-Correction-Unit; anda Motion-Acceleration-Limit-Inputting-Unit that inputs a motion acceleration limit of the leaves,wherein said Leaf-Position-Correction-Unit corrects the leaf positions of an area, where the calculated motion acceleration exceeds the inputted acceleration limit, such that the leaf motion acceleration is equal to or less than the inputted acceleration limit. 13. The radiation therapy treatment planning machine according to claim 8, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the leaf positions corrected by said Leaf-Position-Correction-Unit; anda Motion-Acceleration-Limit-Inputting-Unit that inputs motion acceleration limit of the leaves,wherein said Leaf-Position-Correction-Unit corrects the leaf positions of an area, where the calculated motion acceleration exceeds the inputted acceleration limit, such that the leaf motion acceleration is equal to or less than the inputted acceleration limit. 14. The radiation therapy treatment planning machine according to claim 7, wherein said Motion-Speed-Limit-Establishing-Unit comprises a Motion-Speed-Limit-Setting-Unit that sets a predetermined motion speed limit of the leaves as the established motion speed limit. 15. The radiation therapy treatment planning machine according to claim 14, wherein the leaf positions are corrected toward a direction to widen the radiation field shape when said Leaf-Position-Correction-Unit corrects the leaf positions of an area where the calculated motion speed exceeds the predetermined set motion speed limit such that the leaf motion speed is equal to or less than the predetermined set motion speed limit. 16. The radiation therapy treatment planning machine according to claim 15, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the leaf positions corrected by said Leaf-Position-Correction-Unit; anda Motion-Acceleration-Limit-Setting-Unit that sets a motion acceleration limit of the leaves,wherein said Leaf-Position-Correction-Unit corrects the leaf positions of an area, where the calculated motion acceleration exceeds the predetermined set acceleration limit, such that the leaf motion acceleration is equal to or less than the predetermined set acceleration limit. 17. The radiation therapy treatment planning machine according to claim 14, wherein the leaf positions are corrected toward a direction to narrow the radiation field shape when said Leaf-Position-Correction-Unit corrects the leaf positions of an area where the calculated motion speed exceeds the predetermined set motion speed limit such that the leaf motion speed is equal to or less than the predetermined set motion speed limit. 18. The radiation therapy treatment planning machine according to claim 17, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the leaf positions corrected by said Leaf-Position-Correction-Unit; anda Motion-Acceleration-Limit-Setting-Unit that sets a motion acceleration limit of the leaves,wherein said Leaf-Position-Correction-Unit corrects the leaf positions of an area, where the calculated motion acceleration exceeds the predetermined set acceleration limit, such that the leaf motion acceleration is equal to or less than the predetermined set acceleration limit. 19. The radiation therapy treatment planning machine according to claim 14, further comprising:a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the leaf positions corrected by said Leaf-Position-Correction-Unit; anda Motion-Acceleration-Limit-Setting-Unit that sets a predetermined motion acceleration limit of the leaves,wherein said Leaf-Position-Correction-Unit corrects the leaf positions of an area, where the calculated motion acceleration exceeds the predetermined set acceleration limit, such that the leaf motion acceleration is equal to or less than the predetermined set acceleration limit. 20. A radiation therapy treatment planning machine for use with a multileaf collimator, said machine comprising:a Multileaf-Collimator-Position-Calculation-Unit that generates multileaf collimator leaf positions as a time series;a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the generated time series leaf positions;a Motion-Acceleration-Limit-Establishing-Unit that establishes a motion acceleration limit of the leaves; anda Motion-Display-Unit that indicates leaf motion information of an area where the calculated motion acceleration exceeds the established acceleration limit. 21. The radiation therapy treatment planning machine according to claim 20, wherein said Motion-Acceleration-Limit-Establishing-Unit comprises a Motion-Acceleration-Limit-Inputting-Unit that inputs a motion acceleration limit of the leaves as the established motion acceleration limit. 22. The radiation therapy treatment planning machine according to claim 20, wherein said Motion-Acceleration-Limit-Establishing-Unit comprises a Motion-Acceleration-Limit-Setting-Unit that sets a predetermined motion acceleration limit of the leaves as the established motion acceleration limit. 23. A radiation therapy treatment planning machine for use with a multileaf collimator, said machine comprising:a Multileaf-Collimator-Position-Calculation-Unit that generates multileaf collimator leaf positions as a time series;a Motion-Acceleration-Calculating-Unit that calculates leaf motion acceleration based on the generated time series leaf positions;a Motion-Acceleration-Limit-Establishing-Unit that establishes a motion acceleration limit of the leaves; anda Leaf-Position-Correction-Unit that corrects the leaf positions of an area, where the calculated motion acceleration exceeds the established motion acceleration limit, such that the leaf motion acceleration is equal to or less than the established motion acceleration limit. 24. The radiation therapy treatment planning machine according to claim 23, wherein said Motion-Acceleration-Limit-Establishing-Unit comprises a Motion-Acceleration-Limit-Inputting-Unit that inputs a motion acceleration limit of the leaves as the established motion acceleration limit. 25. The radiation therapy treatment planning machine according to claim 23, wherein said Motion-Acceleration-Limit-Establishing-Unit comprises a Motion-Acceleration-Limit-Setting-Unit that sets a predetermined motion acceleration limit of the leaves as the established motion acceleration limit.