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Treatment volume shaping with selective beam blocking using the Leksell gamma unit
J C Flickinger1, A Maitz, A Kalend
1University of Pittsburgh School of Medicine, Joint Radiation Oncology Center, PA.
International Journal of Radiation Oncology, Biology, Physics
|September 1, 1990
Summary
Selective beam blocking with the Leksell gamma unit can shape radiation treatment volumes. This technique, verified by film densitometry, aims to reduce complications in radiosurgery.
Area of Science:
- Neurosurgery
- Radiation Oncology
- Medical Physics
Background:
- The Leksell gamma unit utilizes 201 Cobalt-60 beams in a hemispherical array for radiosurgery.
- Current methods may not perfectly conform treatment volumes to target shapes, potentially increasing complications.
Purpose of the Study:
- To investigate the use of selective beam blocking to modify treatment volumes.
- To assess the potential of this technique in improving radiosurgical precision and reducing complications.
Main Methods:
- Utilized computerized 3-D treatment planning software to calculate dose distributions for various blocking patterns.
- Employed film densitometry to experimentally verify the computer-predicted dose changes.
Main Results:
- Selective beam blocking allows modification of treatment volumes into ellipsoid shapes.
- Computer predictions of dose distribution changes were validated through film densitometry.
Conclusions:
- Selective beam blocking offers a method to better match treatment volumes to target shapes.
- Further development of these techniques holds promise for reducing radiosurgery complications.