High definition conformal arc radiation therapy with a multi leaf collimator

摘要

A method for delivering radiation from radiation source to a treatment area (T). A multi-leaf collimator (FIG 3) is positioned between the radiation source and the treatment area to block a portion of the radiation and to define a first treatment field. The collimator is positioned with leaves (200) of the collimator extending longitudinally in a first direction (X). The collimator is first moved through an arc (FIG 4) while delivering radiation through the first treatment field to the treatment area. The multi-leaf collimator is rotated about a central axis (R) extending generally perpendicular to a plane containing at least a portion of the leaves such that the leaves (202) define a second treatment field. The multi-leaf collimator is then moved through a second arc while delivering radiation through the second treatment field to the treatment area.