Clinical implementation of HyperArc

Area of Science:

• Radiation Oncology
• Medical Physics

Background:

• Stereotactic radiotherapy is crucial for treating brain metastases.
• Volumetric Modulated Arc Therapy (VMAT) is a common technique.
• HyperArc offers a potentially advanced approach to stereotactic radiosurgery.

Purpose of the Study:

• To evaluate the clinical implementation of HyperArc for brain metastasis.
• To perform a dosimetric comparison between HyperArc and VMAT plans.
• To verify the dosimetric accuracy of HyperArc treatments.

Main Methods:

• Retrospective planning of eleven brain metastasis cases using HyperArc.
• Dosimetric analysis including conformity index and gradient index.
• Evaluation of different beam energies (6MV-FFF) and jaw tracking.
• Dosimetric verification using ion chamber and radiochromic film.

Main Results:

• HyperArc plans showed improved conformity and gradient indices over VMAT.
• 6MV-FFF beams and jaw tracking further optimized HyperArc plan dosimetry.
• Dosimetric verification confirmed no significant differences between HyperArc and VMAT.

Conclusions:

• HyperArc simplifies stereotactic treatment planning for brain.
• It improves plan dosimetry and offers a safe, efficient delivery system.
• HyperArc represents a valuable advancement in brain stereotactic radiotherapy.