Magnetic Resonance Imaging (MRI) is increasingly essential in radiation therapy (RT) planning and so does the measurement of geometric distortion latent in MR imaging. In this work, we have developed a prototype that can accommodate any type of grid-like phantoms and provides an on-the-scanner software solution for the analysis of spatial distortion MR images. The prototype takes a prior CT scan and a new acquired MR dataset as inputs and generates a qualitative visualization and quantitative evaluation for the spatial distortion in the MRI volume. The prototype was assessed with two grid-like phantoms with good success.
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