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Abstract #0668

An improved spiral technique for imaging gamma knife subject with metal frame

Zhiqiang Li1, Sharmeen Maze1, Shiv Srivastava2, Stephen Sorensen2, and John P Karis1
1Neuroradiology, Barrow Neurological Institute, Phoenix, AZ, United States, 2St Joseph's Hospital and Medical Center, Phoenix, AZ, United States

SSFP is widely used in gamma knife treatment planning in patients with trigeminal neuralgia. A metal frame worn by the patient often causes image artifacts. A spiral FLAIR technique is proposed with an improved approach for concomitant field induced phase error compensation, which is insensitive to the presence of the metal frame. Volunteer results demonstrate good delineation of the trigeminal nerve root entry zone, good adjacent CSF suppression, and good brain stem tissue contrast, therefore providing a potential alternative to SSFP for gamma knife treatment planning.

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