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Increasing dose gradient and uniformity in small fields using modulation: theory and prototypes for cone-based

Edward T Bender¹

¹Department of Human Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, 600 Highland Avenue, Madison, Wisconsin 53792.

Medical Physics

|May 3, 2014

Summary

Modulation in cone-based stereotactic radiosurgery (SRS) improves the balance between dose gradient and uniformity. A prototype device demonstrated enhanced dose shaping capabilities for small fields.

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Area of Science:

Medical Physics
Radiation Oncology

Background:

Stereotactic radiosurgery (SRS) requires precise dose delivery to target tumors while sparing healthy tissue.
Optimizing the tradeoff between dose gradient and uniformity is crucial for effective SRS treatments.
Cone-based SRS systems face challenges in achieving steep dose gradients and high target uniformity simultaneously.

Purpose of the Study:

To explore the theoretical limits of dose gradient and uniformity tradeoff using modulation in cone-based SRS.
To develop and evaluate a prototype collimation device for improved dose shaping in SRS.

Main Methods:

Inverse planning optimization in an idealized phantom to determine ideal fluence patterns for a 'rect function' dose distribution.
Approximation of ideal fluence patterns using a prototype device.
Radiochromic film dosimetry for comparing the prototype device against a standard circular collimator.

Main Results:

Modulation enhances the tradeoff between dose gradient index and dose heterogeneity index for prescription isodose lines above 50%.
Compensators integrated within a circular collimator can achieve the required modulation.
The prototype device showed potential for improved dose shaping compared to standard collimators.

Conclusions:

Submillimeter scale modulation features enable increased dose gradient and/or uniformity in small radiation fields.
The developed prototype collimation device shows promise for advancing SRS treatment precision.