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Symmetry™

Symmetry - managing respiratory motion

While the use of surrogate markers for respiratory tracking initially held promise, subsequent studies have demonstrated an unstable relationship with real anatomy1 and failure to account for the baseline shifts exhibited by lung cancer patients during the course of their treatment2. Now Symmetry has the answer.

Symmetry uses unique anatomically correlated 4D image guidance at the time of treatment to give volumetric visualization of respiratory motion and the ability to correct for baseline shifts.

Accounting for baseline shift will support delivery of treatments with only small margins required for free breathing3. Gating or tracking are not required.

  • Helps achieve symmetrical dose distribution for a variety of planning techniques, including ITV
  • Uninterrupted patient set-up and treatment delivery
  • Accounts for baseline shift
  • Enables margin reduction
  • Simple intuitive workflow
  • Ideal for SBRT


 

Further information

 

XVI Symmetry - 'Managing respiratory motion' brochure

Red Journal

  1. Correlation of lung tumor motion with external surrogate indicators of respiration
    http://www.redjournal.org/article/S0360-3016(04)02068-1/abstract
  2. Variability of Four-Dimensional Computed Tomography Patient Models
    http://www.redjournal.org/article/S0360-3016(07)04074-6/abstract
  3. Comparison of Different Strategies to Use Four-Dimensional Computed Tomography
    in Treatment Planning for Lung Cancer Patients
    http://www.redjournal.org/article/S0360-3016(07)04592-0/abstract

    4. Note: Symmetry is not available for sale or distribution in all regions. Please contact your local Elekta representative or authorized distributor for more information. Symmetry is a feature set of XVI R4.5.