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Rapid emission angle selection for rotating-shield brachytherapy.

Yunlong Liu¹, Ryan T Flynn, Wenjun Yang

¹Department of Electrical and Computer Engineering, University of Iowa, 4016 Seamans Center, Iowa City, Iowa 52242, USA.

Medical Physics

|May 3, 2013

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The Rapid Emission Angle Selection (REAS) method significantly speeds up rotating shield brachytherapy (RSBT) planning, offering a faster alternative to exhaustive methods. This approach achieves comparable treatment plan quality while reducing delivery time for cervical cancer patients.

Area of Science:

Medical Physics
Radiation Oncology

Background:

Rotating Shield Brachytherapy (RSBT) is an advanced radiotherapy technique.
Efficient treatment planning is crucial for optimizing RSBT delivery time and dose conformity.
Current methods for selecting emission angles can be time-consuming.

Purpose of the Study:

To introduce and evaluate the Rapid Emission Angle Selection (REAS) method for RSBT.
To enable efficient selection of azimuthal shield angles in RSBT.
To balance treatment delivery time and tumor dose conformity.

Main Methods:

The REAS method was tested on two cervical cancer patient cases using a Xoft Axxent™ electronic brachytherapy source.
Anchor RSBT plans were generated at specific emission angles (90°, 180°, 270°).

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REAS converts anchor plans to cover all angles by combining beamlets; compared against exhaustive dose-volume (ERVO) and surface optimization (ERSO) plans.

Main Results:

REAS is approximately 10 times faster than ERVO by selecting only three emission angles.
REAS plans reduced delivery time by 19.5-21.0% compared to ERSO plans.
REAS improved D90 dose contributions by 5.1-5.8% compared to ERSO plans within set time budgets.

Conclusions:

The REAS method provides an efficient approach for RSBT treatment planning and delivery.
REAS generates treatment plans of comparable quality to exhaustive dose-volume optimization methods.
This method offers a practical solution for balancing treatment time and dose conformity in RSBT.