Abstract: The present invention discloses an intracavitary radiotherapy apparatus, which is used for carrying radioactive particles or particle strips, comprising: a body that is formed by winding metal wires, and is a wire mesh having a hollow cavity penetrating through same in the forward and backward directions; and a radioactive particle groove that is provided on the outer surface of the body, is a cylindrical wire mesh having a hollow cavity penetrating through same in the forward and backward directions, and is used for accommodating the radioactive particles or particle strips. The radioactive particle groove comprises a plurality of groove bodies arranged in parallel, and the spacing between two adjacent groove bodies is less than the length of the radioactive particles or particle strips.

Abstract: Methods for measuring and registering positions and directions in image space with that in world space includes: providing an assembly with a tracking tool; the assembly including positional and/or directional objects with positions and available directions measured according to the tracking tool's frame with a measuring piece having a measuring surface for measuring without prior calibration with a measuring tracking tool in a tracking system; placing the assembly on a body and perform scanning; placing a relative tracking tool at the body; in registering time, recording the data for both the relative tracking tool and the tracking tool attached to the assembly; placing a tracking tool on an instrument; in post-registering time, recording both data of the tracking tool attached on the instrument and data of the relative tracking tool; computing converted positions and/or available directions of the tracking tool attached on the instrument in the image space.