Patent Number: 
Section: claims

1. A treatment planning system for creating treatment plan information for particle therapy, comprising:an input device;an arithmetic device for performing arithmetic processing based on a result of input to the input device and creating treatment plan information; anda display device for displaying the treatment plan information,wherein the arithmetic device calculates a scanning path by setting a pre-specified direction as a main direction for scanning irradiation positions with an ion beam using scanning magnets, the pre-specified direction being along a direction of movement of a target of treatment, andwherein the display device displays the direction of movement of the target of treatment. 2. The treatment planning system according to claim 1,wherein the arithmetic device extracts the direction of movement of the target of treatment using at least one feature points in one or more images. 3. The treatment planning system according to claim 2,wherein the arithmetic device calculates the scanning path based on the at least one feature points in the one or more images in different phases projected on an isocenter plane relative to the ion beam, where the at least one feature points are markers. 4. The treatment planning system according to claim 2,wherein the arithmetic device calculates the scanning path based on the at least one feature points in the one or more images in different phases which exist in a specified region of the target and are projected on an isocenter plane relative to the ion beam, where the at least one feature points are markers. 5. The treatment planning system according to claim 2,wherein the arithmetic device calculates the scanning path based on the at least one feature points of the one or more images in different phases, where the at least one feature points are markers. 6. The treatment planning system according to claim 1,wherein the display device displays the moving direction of the target of treatment and at least one feature point. 7. The treatment planning system according to claim 1,wherein the display device displays the scanning path calculated by the arithmetic device. 8. The treatment planning system according to claim 1,wherein the display device displays a component of the direction of movement of the target of treatment perpendicular to an isocenter plane with respect to the ion beam. 9. The treatment planning system according to claim 1,wherein the direction of movement of the target of treatment extracted by the arithmetic device is changed according to the input received by the input device. 10. The treatment planning system according to claim 1,wherein the direction of movement of the target of treatment is specified according to the input received by the input device.