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Conical beam geometry intensity-modulated radiation therapy.

Emil Schüler1, Lei Wang1, Billy W Loo1,2,3

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This summary is machine-generated.

A novel static conical beam arrangement in radiation therapy shows comparable plan quality to VMAT and CyberKnife. This innovative geometry allows for integrated imaging and treatment, demonstrating promise for future applications.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Technology

Background:

  • Conventional radiation therapy often uses coplanar beam arrangements.
  • Non-coplanar beams offer potential advantages in treatment planning.
  • A novel linac design with a static conical beam arrangement has been developed at Stanford.

Purpose of the Study:

  • To compare treatment plans generated with a novel conical beam geometry against state-of-the-art VMAT and CyberKnife plans.
  • To evaluate the dosimetric differences and plan quality across various clinical cases (prostate, lung, head/neck, pediatric brain).
  • To assess the feasibility of integrating full ring diagnostic CT with a shared isocenter in the novel design.

Main Methods:

  • Treatment plans were generated for four clinical cases using 45° or 60° conical beam IMRT (Intensity-Modulated Radiation Therapy) and coplanar 90° VMAT (Volumetric Modulated Arc Therapy).
  • Double and single cone geometries were evaluated.
  • Plans were optimized using RayStation and MultiPlan software, with CyberKnife IMRT plans generated for prostate and pediatric cases for comparison.

Main Results:

  • The conical arrangement showed increased rectal and bladder dose but decreased femoral head dose in the prostate case compared to 90° VMAT.
  • Minor dosimetric differences were observed in the lung case; selective organ sparing was noted in pediatric brain and head/neck cases with conical beams.
  • CyberKnife plans showed some advantages in specific organs but with increased integral dose and reduced conformity compared to the 60° conical plan in prostate and pediatric brain cases.

Conclusions:

  • Comparable treatment plan quality can be achieved with the novel conical beam arrangement, 90° VMAT, and CyberKnife IMRT.
  • The static conical beam geometry demonstrates promise for advanced radiotherapy techniques.
  • This novel beam geometry facilitates volumetric image-guidance with full ring imaging and a common isocenter for simultaneous treatment and imaging.