Stereotactic Body Radiotherapy for Lung Cancer: Insights from an Institutional CyberKnife Study

This retrospective study aimed to evaluate the treatment plans and analyse the dosimetric parameters for stereotactic body radiotherapy (SBRT) using the CyberKnife® system in patients with inoperable primary or metastatic lung cancer. Ten lung cancer patients treated with SBRT using the CyberKnife® were included in the study. Treatment plans were designed using the Precision 3.3.1.2 treatment planning system, with optimization performed using the Monte Carlo algorithm. Two tracking methods were employed: fiducial markers with Synchrony® in five cases and direct tumor visualization using Xsight® Lung in the remaining five cases. Patient-specific quality assurance (QA) was conducted using SRS MapCHECK® and StereoPHAN™ phantom, with gamma analysis performed using 2%/2 mm criteria and a 10% threshold.