m003002801005.pdf 2.18 MB
While CT is essential for planning radiation therapy, MRI is used for imaging brain tumors for greater soft tissue contrast and more accurate depiction of tumors, particularly in cases involving stereotactic radiosurgery（SRS）. However, MRI is characterized by greater image distortion than CT, making accurate localization of the target tumor difficult. This study evaluated the effects of such distortion on SRS planning. CT and MRI incorporating SRS planning parameters were performed on a brain phantom, and the images were then fused for comparison. We compared treatment parameters obtained from CT data alone with those obtained from the fused images. A maximum linear distortion of 3.3 mm was observed on coronal MRI. When SRS planning incorporated the coronal MRI data, treatment parameters derived from CT data alone were less accurate than those obtained from the fused images.
Shimane journal of medical science
Shimane University Faculty of Medicine