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Compensators for intensity-modulated beams.

D M Dimitriadis¹, B G Fallone

¹Medical Physics Unit, McGill University Health Science Centre, Montreal, Canada.

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

|October 11, 2002

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Attenuator scatter significantly impacts compensator construction. Cerrobend attenuators cause beam hardening and scatter, leading to potential errors in radiation therapy dose calculations.

Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Physics

Background:

Compensators are crucial in radiotherapy for dose shaping.
Lipowitz metal (cerrobend) is a common attenuator material.
Understanding scatter and beam hardening from attenuators is vital for accuracy.

Purpose of the Study:

To investigate the impact of attenuator scatter on compensator construction.
To measure linear attenuation coefficients and scatter contributions of cerrobend.
To evaluate the accuracy of an exponential attenuation model for compensator design.

Main Methods:

Measured linear attenuation coefficients of cerrobend for a 6-MV photon beam.
Quantified dose contribution from photons scattered by the attenuator.

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Investigated beam hardening and scatter-to-primary ratio variations with cerrobend thickness and field size.

Developed compensators using an exponential attenuation model.

Main Results:

Beam hardening caused a significant 6.2% transmission error for 6 cm of cerrobend.
Maximum scatter contribution was 19.8% of primary dose for large fields and thick cerrobend.
A maximum deviation of 6% was observed between measured and predicted fluence profiles for simple compensators.

Conclusions:

Attenuator scatter is a significant factor in compensator construction.
The exponential attenuation model shows deviations, partly due to scatter.
Accurate modeling of scatter and beam hardening is necessary for precise compensator design in radiotherapy.