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Abstract #2960

Geometrical Distortion Rectification Using Image Stitching in Open MRI

Cheolpyo Hong1, Teaho Kim2, Donghoon Lee1, Manwoo Lee3, Bongsoo Han1

1Department of Radiological Science, Yonsei Univ., Wonju, Gangwon-do, Korea, Republic of; 2Radiation Physics Laboratory, The University of Sydney, Sydney, Australia; 3Genpia Co., Wonju, Gangwon-do, Korea, Republic of

The primary advantage of magnetic resonance imaging (MRI) in radiotherapy is its excellent soft tissue contrast. The accuracy of the tumor volume delineation can be improved using MRI in combination with CT during treatment planning. Recently, open-type MR systems have become attractive for image-guided radiotherapy due to their easy patient access configuration. However, geometric image distortion by imaging gradient nonlinearity hinders the practical applications of MRI in radiotherapy. In this study, we propose an image stitching algorithm to merge non-distorted images obtained at the isocenter of the magnet and demonstrate an extended field of view using the proposed geometric distortion correction technique.