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Intensity-modulated radiosurgery: improving dose gradients and maximum dose using post inverse-optimization

Martin Fuss¹, Bill J Salter

¹Department of Radiation Medicine, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, Oregon 97239, USA. fussm@ohsu.edu

Technology in Cancer Research & Treatment

|May 31, 2007

Summary

Intensity-modulated radiosurgery (IMRS) software with ActiveRx post-optimization significantly improves dose gradients and target coverage for brain metastases. This enhancement reduces normal tissue exposure and treatment time, becoming a routine clinical practice.

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Area of Science:

Radiation Oncology
Medical Physics
Neurosurgery

Background:

Intensity-modulated radiosurgery (IMRS) is utilized for treating brain metastases and arteriovenous malformations.
Serial tomotherapy systems have been used in over 150 cases.
A novel software tool, ActiveRx, enables post-inverse planning re-optimization.

Purpose of the Study:

To evaluate the ActiveRx software's ability to enhance dose gradient steepness and in-target dose homogeneity.
To assess the impact of ActiveRx on dose conformity and normal tissue sparing.
To determine changes in treatment time and monitor units with ActiveRx optimization.

Main Methods:

Fifteen clinically delivered IMRS plans for brain metastases were re-optimized using ActiveRx.
The software's tools (hot spot eraser, pencil tool, drag and drop) were employed for dose redistribution.
Key dosimetric parameters including isodose volumes, conformity index (CI), homogeneity index (HI), and target doses were analyzed.

Main Results:

ActiveRx improved the mean conformity index from 1.23 to 1.14 and increased the homogeneity index from 115% to 141%.
Significant improvements were observed in the steepness of dose gradients, particularly for the 90% and 50% isodose lines.
Total monitor units decreased by 12.3%, reducing treatment delivery time by an average of 3.2 minutes.

Conclusions:

Post-inverse planning optimization with ActiveRx significantly enhances IMRS plan quality for cranial applications.
The software effectively sharpens dose gradients and improves target dose coverage while reducing irradiated normal brain tissue.
ActiveRx optimization has been integrated into the routine clinical workflow for cranial IMRS procedures.