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Intensity-modulated radiation therapy using a variable-aperture collimator.

S Webb¹, G Hartmann, G Echner

¹Joint Department of Physics, Institute of Cancer Research and Royal Marsden NHS Trust, Downs Road, Sutton, Surrey, SM2 5PT, UK.

Physics in Medicine and Biology

|May 27, 2003

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This study introduces a variable-aperture collimator (VAC) for intensity-modulated radiation therapy (IMRT) delivery without a multileaf collimator. The VAC simplifies IMRT by reducing field components and monitor units compared to jaws-only methods.

Area of Science:

Medical Physics
Radiation Oncology

Background:

Intensity-modulated radiation therapy (IMRT) delivery often relies on complex multileaf collimators.
Previous methods for IMRT without multileaf collimators involved tertiary masks and jaws, which can be cumbersome.

Purpose of the Study:

To present a novel method for IMRT delivery using a variable-aperture collimator (VAC) as an alternative to multileaf collimators.
To evaluate the efficiency of the VAC method in terms of field components and monitor units compared to existing techniques.

Main Methods:

A stripping algorithm was developed to decompose an intensity-modulated beam (IMB) into deliverable static-field components using a VAC.
Several VAC designs, including a simple VAC and a hybrid VAC, were conceptualized and analyzed.
The potential benefit of rotating the VAC for specific field components was investigated.

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Main Results:

The VAC method resulted in a lower mean number of field components and monitor units compared to jaws-only (JO) decomposition.
The proposed VAC designs are simpler to construct than previous jaws-plus-mask (J+M) combinations.
Rotating the VAC was shown to be advantageous for certain modulated field components.

Conclusions:

The variable-aperture collimator (VAC) offers a simpler and potentially more efficient approach for IMRT delivery without a multileaf collimator.
The VAC method reduces the complexity and resource requirements for delivering intensity-modulated beams.
Further investigation into hybrid VAC designs and rotational capabilities could enhance IMRT delivery further.