PP-RT-RSU-04 The Comparison of Auto-Adjust System Efficiency between 2D Stereoscopic Image Registration and 3D Volumetric Image Registration

Abstract

Novel radiation therapy is focused on the precision of radiation delivery into lesions or tumor using several delivery techniques such as IMRT, VMAT, SRS and SBRT, which require imaging guided radiation technology (IGRT) to assist in verifying the lesion location according to the treatment plan. The current image guided radiation technology can be divided into two types of image sources: the use of 2D and 3D images, which are suitable for different applications. Therefore, the research team had the idea to do a comparative study in terms of performance by using specially designed models for this purpose, and found that using 3D-image was more effective than using 2D-image. However, the results suggest a tendency for automatic alignment failures. If the patient alignment (setup), before using both 2D and 3D image verification systems, has a greater distance from the isocenter position, the greater the discrepancy at the automatic alignment system. Therefore, the researchers recommend that initial alignment is still important despite the presence of image guided system.