The CyberKnife in clinical use: current roles, future expectations

Area of Science:

• Medical Physics
• Radiation Oncology
• Robotics in Medicine

Background:

• The CyberKnife system utilizes a robotic arm with an integrated linear accelerator for precise, image-guided stereotactic radiotherapy.
• Its nonisocentric beam delivery and active image guidance are key design advantages for accurate tumor targeting.
• Established efficacy for brain and head lesions, with expanding applications in stereotactic body radiotherapy.

Purpose of the Study:

• To highlight recent hardware and software advancements in the CyberKnife system.
• To detail functional enhancements improving treatment speed, accuracy, and plan optimization.
• To underscore the expanding clinical utility of CyberKnife for diverse oncological targets.

Main Methods:

• Implementation of optimized path traversal algorithms to reduce robotic motion time.
• Integration of Monte Carlo algorithms for enhanced dose calculation accuracy.
• Introduction of the IRIS collimator for reduced monitor units and improved plan quality.
• Development of XSight lung tracking for fiducial-less tumor localization.
• Adoption of sequential optimization planning for complex treatment criteria.

Main Results:

• Significant reductions in overall treatment times (5-10 minutes) due to optimized robot motion.
• Improved dose calculation accuracy via Monte Carlo methods.
• Enhanced treatment plan conformality and homogeneity with the IRIS collimator.
• Successful development of fiducial-less tracking for peripheral lung tumors.
• Increased planning flexibility through sequential optimization.

Conclusions:

• Recent CyberKnife system upgrades substantially enhance its functionality, speed, and accuracy.
• The system's versatility allows for effective radiosurgery and stereotactic body radiotherapy across multiple anatomical sites.
• Ongoing clinical studies demonstrate its efficacy for treating various malignancies, including spine, lung, pancreas, liver, and prostate tumors.