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Abstract #0119

Rapid MR Imaging of Ocular Movement using Shared K-Space Data for Radiotherapy Planning

Luc van Vught1,2, Kirsten Koolstra2, and Jan-Willem Beenakker1,2

1Ophthalmology, Leiden University Medical Center, Leiden, Netherlands, 2Radiology, C.J. Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, Netherlands

During ocular movement, the shape and location of the intra-orbital structures change. Outlining these changes will improve the accuracy of radiotherapy treatment planning for ocular tumors and the treatment of impaired ocular movement. The resolution of ocular MRI is, however, limited by acquisition time due to eye-motion. Therefore, an acquisition strategy in which outer k-space data is shared between gaze directions was developed and evaluated in 7 healthy and 2 myopic subjects. With this technique, the location of the orbital structures was determined for nine gaze directions in approximately one minute.

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