Evaluation on Usefulness of Applying Body-fix to Four Dimensional Radiation Therapy

Abstract

This study investigates the usefulness of body fix in 4DRT on Liver cancer trying to find tumor tissue's volume and located variations, absorbed dose on tumor and normal tissues. Test subjects 23 patients were agreed these test. These patient's have a 4 dimensional CT scan. We make an acquisition on patients CT image by two types-put on the body fix or not-. Average tumor volume reduced by 0.17% on GTV and 3.2% on CTV and PTV. Tumor's variation reduces 29.8%(anterior and posterior, AP) and 5.31% (upper and lower, UL). The absorbed tumor doses under put on the body fix was a little higher(1.3%) than other. Normal tissues'(normal liver, stomach, Rt. kidney, spinal cord) absorbed dose could be reduced approximately 5%. Therefore, using body fix on 4DRT for liver cancer patient is considered effectively.

Advanced Vision System by Subtraction of Background Image for Patient’s Movement during Treatment

“…Based on the position coordinates, that is, by controlling the stereo camera, so that the control main viewpoint and FOV of the target image (field of view) together. Then, the left, which is the current input, by utilizing the setting value and the fan or the tilt movement angle of the stereo camera that operates based on the coordinate values of the right camera image and calculates distance information to track video [4].…”