Couch positioning system for radiotherapy, treatment plan unit, and couch positioning unit

A treatment plan unit for radiotherapy, comprising:

• a display unit;
• a first operation unit for displaying an X-ray CT image on said display unit, and setting a first calculation point to the X-ray CT image displayed on said display unit by calculating and storing 3D coordinates of the first calculation point used for couch positioning operations in the X-ray CT image;
• a second operation unit for generating first image data for providing a first image which simulates X-ray imaging based on CT image data for providing the X-ray CT image;
• and
• a third operation unit for operating the 2D coordinates of the first calculation point in the first image by use of the 3D coordinates of the first calculation point set to the X-ray CT image;
• adding the 3D and 2D coordinates of the first calculation point to the first image data;
• and storing the first image data to generate a first image file.

A couch positioning unit for radiotherapy, comprising:

• a display unit;
• a storage unit for storing first image data generated based on CT image data for providing said X-ray CT image for providing a first image which is a reference image for couch positioning, the first image data being added with 3D coordinates of a first calculation point used for couch positioning operations and set beforehand in the X-ray CT image;
• a fourth operation unit for displaying on said display unit the first image which is the reference image for couch positioning;
• displaying the first calculation point at a position corresponding to the first calculation point in the first image by use of 2 coordinates acquired from the 3D coordinates of the first calculation point;
• displaying a second image which is the present image of an irradiation target on the couch;
• and setting a second calculation point used for the couch positioning operations at a target position corresponding to the first calculation point in the second image;
• and
• a fifth operation unit for performing operations for reconstructing 3D coordinates from the 2D coordinates of the second calculation point;
• and generating couch positioning data by use of the 3D coordinates of the set first calculation point and the 3D coordinates of the second calculation point.