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Management of MRI Spatial Accuracy for Radiation Therapy

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.

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