Treatment planning for bicentric stereotactic irradiation

Area of Science:

• Radiation Oncology
• Medical Physics
• Radiosurgery

Background:

• Stereotactic radiosurgery requires precise targeting for irregularly shaped tumors.
• Conventional techniques may struggle with elongated or complex target volumes.
• Optimizing beam parameters is crucial for effective dose delivery.

Purpose of the Study:

• To investigate a bicentric stereotactic convergent beam irradiation technique.
• To determine optimal parameters for treating irregularly shaped and elongated target volumes.
• To provide starting parameters for interactive dose distribution optimization.

Main Methods:

• Developed and investigated a bicentric stereotactic convergent beam irradiation technique.
• Determined optimum isocenter distance, collimator apertures, and dose inhomogeneity values.
• Utilized the SRS-200 (Philips) treatment planning system for calculations.
• Generated parameter tables applicable to various stereotactic systems.

Main Results:

• Established optimal parameter ranges based on target volume size and shape.
• Demonstrated the technique's applicability for irregularly shaped and elongated targets.
• Provided a foundation for interactive dose distribution optimization.

Conclusions:

• The bicentric stereotactic convergent beam technique is effective for complex target volumes.
• Optimized parameters enhance dose distribution accuracy in radiosurgery.
• The findings are transferable to different stereotactic treatment systems.