Management of MRI Spatial Accuracy for Radiation Therapy
February 21, 2020
Radiation Therapy (RT) demands tight constraints regarding the geometric accuracy of image data used in its workflows for treatment simulation and in-room treatment delivery guidance. The spatial accuracy requirements are largely driven by the ability to deliver and deposit therapeutic radiation doses to targeted anatomical sites (1-2 mm). The benefits of MRI’s superior soft-tissue contrast as compared to RT’s gold standard based on x-ray imaging (i.e. CT, Cone Beam CT) are somewhat over- shadowed by the intrinsic MR image distortions manifested as loss of spatial accuracy and local intensity inhomogeneities.