A Study of Portal Image for the Verification of Radiation Therapy

초록

In this paper, Real time digital radiography system was implemented for verification of local error between simulation plan and radiation therapy machine. Portal image can be acquired by CCD camera, image board and pentium PC after therapy Radiation was converted into light by a metal/fluorescent Screen. Since the resulting image quality is comparable to film, The imaging system represents a promising alternative to film as a method of verifying patient positioning in radiotherapy. Edge detection and Field size measurement were also implemented and detected automatically for verification of treatment position. Field edge was added to the original image for checking the anatomical treatment verification by therapy technicians. By means of therapy efficiency improvement and decrease of Radiation side effects with these techniques, Exact Radiation treatments are expected.