In what situations do you utilize motion management of the optic structures?
What techniques do you employ for motion management?
2 Answers
Mednet MemberInvited Expert
Radiation Oncology · University of Louisville School of Medicine
Answered on
A paper published in Br J Radiol. 2019 (Xiang et al., PMID 31067077) showed, based on MRI, an average physiological motion of the optic chiasm to be 0.5-0.75mm. We have used at least 1mm expansion of the optic nerves and chiasm in our stereotactic radiosurgery treatment planning.
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Mednet Member
Radiation Oncology · Banner M.D. Anderson Cancer Center
Answered on · Updated on
It is also important to pay attention to direction of gaze during treatment/intra-fractionally. The optic nerves move considerably with medial and lateral gaze. See the below video. It may give you palpitations!
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