A method to reduce the influence of fixed lead door and wild lead door position error on planned dose

Abstract

The invention discloses a method for reducing the influence of the in-position error of the fixed lead gate and the wild lead gate on the planned dose. ; S2, select the range of possible values ​​for the coordinates of the fixed lead door and the shooting field lead door; S3, customize a blade below the lead door as a static closed blade, so that the blade blocking the fixed lead door and the wild lead door is statically closed; S4, set The reduction of the fixed jaw shot field in the planning system is an option system that affects the planned dose due to the in-position error of the fixed jaw field. The virtual coordinates are used as the actual jaw coordinates, which effectively solves the problem that the in-position error of the fixed jaw shooting field may cause the change of the target dose to block the moving projection blades.

Description

technical field

[0001] The invention relates to the technical field of the method for influencing the dose due to the in-position error of the jaw, in particular to a method for reducing the influence of the in-position error of the fixed jaw and wild jaw on the planned dose. Background technique

[0002] In recent years, with the rapid development of radiotherapy technology, the fixed lead gate technology is more and more used in clinical practice. The fixed lead gate technology can effectively reduce the low dose irradiation of normal tissues of patients and ensure the dose coverage of the treatment target area. However, in the fixed jaw field, there is often a jaw border parallel to the MLC blade directly above the target area. The in-position error of this jaw will cause the jaw to change the blade occlusion width of the projected ray, thereby affecting the dose, making Dose cold spots and low-dose areas appear in PTV, which brings great uncertainty to the treatment and ...

Images