Patent ID: 8242465

Claim:
A driving type patient platform having a top board on which an irradiation subject is fixed when a radiation is irradiated onto the irradiation subject, the driving type patient platform comprising: translation unit that translate the top board in the X direction, the Y direction, and the Z direction, respectively, in a fixed coordinate system fixed to an installation place where the driving type patient platform is installed; rotation unit that rotate the top board in the θ direction around the X axis, the φ direction around the Y axis, and the ξ direction around the Z axis, respectively; and a control device that controls the translation unit and the rotation unit, based on an inputted desired rotation center point and an inputted desired rotation angle, wherein the control device is provided with a rotation drive signal generation unit that generates a rotation drive signal for performing rotation movement of the top board from the reference position states of the translation unit and the rotation unit to the desired rotation angle; and a translation drive signal generation unit that generates a translation drive signal for translating the translation unit in such a way that the amount of translation movement of the desired rotation center point, that is caused by the rotation movement becomes the same as or smaller than a predetermined value, and wherein the translation drive signal generation unit is provided with a unit that generates the coordinates (p a ) to be obtained by coordinate-transforming the coordinates (P fix ) of the desired rotation center point in the fixed coordinate system in the reference position states into the moving coordinate system fixed to the top board; a unit for transforming the coordinate (p a ) into coordinate (P ab ), where coordinate (P ab ) is the coordinate of the point (p a ) assumed to have rotation-moved to the desired rotation angle along with the top board, expressed in the fixed coordinate system; and a unit that generates a translation drive signal for making the moving amounts of the translation unit in the respective directions the same as or smaller than the predetermined value, based on the difference between the coordinates (P fix ) and the coordinates (P ab ).