An Automated Image-based Method for Multi-Leaf Collimator Positioning Verification in Intensity Modulated Radiation Therapy
نویسندگان
چکیده
Intensity Modulated Radiation Therapy (IMRT) is an innovative, three-dimensional conformal radiation treatment that can deliver highly focused and precisely shaped radiation to a tumor site through the use of the Multi-Leaf Collimators (MLC). A crucial step in IMRT procedure is the verification of MLC positioning to assure the accuracy of radiation treatment delivery. In this paper, we have developed an automated image based method for MLC positioning verification using images acquired from an Electronic Portable Imaging Device. The method consists of three major steps: 1) non-linear geometric distortion correction, 2) isocenter estimation, and 3) MLC leaf boundary recovery. Preliminary experiment on real image data shows that the proposed method is both fast and robust to image artifacts such as intensity inhomogeneity and noise, making it a promising approach for replacing manual verification of MLC in the IMRT treatment.
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