Fat saturated and unsaturated T2W images of the same anatomy are required for MRI lung radiotherapy treatment planning. A prospective 'keyhole' pulse sequence that produces both image contrasts at full resolution via acquisition of a subset of FS k-space substituted into the non FS k-space was simulated. Simulated FS images with 50% of FS k-space substituted in a cross hair pattern were found to be only slightly inferior to acquired FS images by four clinicians based on scoring for delineation suitability. The prospective pulse sequence would save MR protocol time and improve the patient experience.
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