Technology in Cancer Research & Treatment (Mar 2024)

Patient Cranial Angle and Intrafractional Stability in CyberKnife Robotic Radiosurgery: A Retrospective Analysis

  • Chen-Lin Kang PhD,
  • Ya-Yu Huang MS,
  • Yi-Ren Chen MS,
  • Shu-Huei Tsai BS,
  • Chun-Chieh Huang MD,
  • Yu-Jie Huang MD, PhD

DOI
https://doi.org/10.1177/15330338241235058
Journal volume & issue
Vol. 23

Abstract

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Purpose: The aim of this study was to investigate whether variations in cranial angles and treatment accuracy during CyberKnife robotic radiosurgery necessitate adjustment of the margins of the planning target volume. Patients and Methods: Data from 66 patients receiving CyberKnife treatment for brain tumors were retrospectively analyzed. Patients were immobilized using a thermoplastic mask and headrest. The cranial angle was measured on planning CT and patients were divided into 2 groups: ≤10° (Group A) and >10° (Group B). Intrafractional motion was recorded using the CyberKnife tracking system over 50 min. Translational and rotational errors were compared between groups, and planning target volume margins were calculated. Results: In Group A, significant translational error differences were found along with the X-axis over time ( P 10°.