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The Siemens virtual wedge

P McGhee¹, T Chu, K Leszczynski

¹Department of Medical Physics, Northeastern Ontario Regional Cancer Centre, Sudbury, Canada.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists

|April 1, 1997

Summary

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The Siemens Virtual Wedge, a new radiation therapy tool, shows excellent accuracy in dose delivery and beam profiles. It also reduces peripheral dose, simplifying treatment planning and enhancing online imaging capabilities.

Area of Science:

Medical Physics
Radiation Oncology

Background:

The implementation of advanced technologies in radiation oncology is crucial for improving treatment precision.
Siemens Virtual Wedge technology offers a potential alternative to traditional physical wedges in radiotherapy.

Purpose of the Study:

To evaluate the performance and clinical utility of a newly installed Siemens Virtual Wedge at a regional cancer center.
To validate a clinical protocol for combined open and wedged fields using the Virtual Wedge.

Main Methods:

Commissioning and measurement of Virtual Wedge factors, percentage depth doses, and cross beam profiles.
Comparison of Virtual Wedge performance against established physical wedge parameters.
Development and validation of a clinical protocol integrating the Virtual Wedge.

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Main Results:

Virtual Wedge factors were within 1.5% of unity, and depth doses matched open fields within 0.7%.
Cross beam profiles showed high similarity to physical wedges, with minor differences at the toe end (5% relative dose).
The 60-degree Virtual Wedge demonstrated approximately half the peripheral dose compared to its physical counterpart.

Conclusions:

The Siemens Virtual Wedge meets stringent performance criteria for clinical use in radiation therapy.
The validated clinical protocol facilitates the use of online portal imaging and reduces system commissioning time.
The Virtual Wedge offers dosimetric advantages and simplifies treatment delivery workflows.