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A new Trajectory-based Volumetric Modulated Arc Therapy (TVMAT) technique for stereotactic radiosurgery (SRS) offers improved dose distribution and planning efficiency. This method achieves better target conformity and reduced organ-at-risk dose in just 3-8 minutes.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiosurgery

Background:

  • Modern linear accelerators (linacs) enable dynamic modulation of dose rate and couch motion.
  • Trajectory-based Volumetric Modulated Arc Therapy (TVMAT) leverages these capabilities for stereotactic radiosurgery (SRS).

Purpose of the Study:

  • To develop and investigate a novel TVMAT technique for SRS.
  • To evaluate the dosimetric accuracy and treatment quality of the TVMAT method.
  • To compare TVMAT with existing techniques like Dynamic Conformal Arc (DCA) and VMAT.

Main Methods:

  • TVMAT utilizes dynamic couch rotation and continuous gantry sweeps to form beam trajectories.
  • Inverse planning optimizes the multi-leaf collimator (MLC) and dose rate along these trajectories.
  • The technique was tested on ten cranial SRS patients, comparing plans against DCA and VMAT, with validation via ion-chamber and film dosimetry.

Main Results:

  • TVMAT plans were deliverable within 3-8 minutes with high dosimetric accuracy (ion-chamber error: 1.1 ± 0.6%, gamma pass rates >96%).
  • TVMAT demonstrated improved dose conformality, reduced V4Gy and V12Gy, and better organ-at-risk sparing compared to DCA.
  • Significant improvements were observed in conformity (10%), V4Gy (20%), V12Gy (27%), and OAR dose (13%) compared to DCA.

Conclusions:

  • A validated TVMAT method offers superior dose distribution and efficient treatment times (3-8 min) for SRS.
  • The technique shows potential for simplified treatment planning.
  • Accurate delivery on Varian Truebeam linacs is maintained with TVMAT.