IRLED-Based Patient Localization for Linac Radiosurgery

Sanford L Meeks; Francis J Bova; William A Friedman; John M Buatti; Russell D Moore; William M Mendenhall

doi:10.1016/S0360-3016(98)00040-6

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IRLED-Based Patient Localization for Linac Radiosurgery

Journal article

Peer reviewed

IRLED-Based Patient Localization for Linac Radiosurgery

Sanford L Meeks, Francis J Bova, William A Friedman, John M Buatti, Russell D Moore and William M Mendenhall

International journal of radiation oncology, biology, physics, Vol.41(2), pp.433-439

1998

DOI: 10.1016/S0360-3016(98)00040-6

PMID: 9607362

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Abstract

Purpose: Currently, precise stereotactic radiosurgery delivery is possible with the Gamma Knife or floor-stand linear accelerator (linac) systems. Couch-mounted linac radiosurgery systems, while less expensive and more flexible than other radiosurgery delivery systems, have not demonstrated a comparable level of precision. This article reports on the development and testing of an optically guided positioning system designed to improve the precision of patient localization in couch-mounted linac radiosurgery systems. Methods and Materials: The optically guided positioning system relies on detection of infrared light-emitting diodes (IRLEDs) attached to a standard target positioner. The IRLEDs are monitored by a commercially available camera system that is interfaced to a personal computer. An IRLED reference is established at the center of stereotactic space, and the computer reports the current position of the IRLEDs relative to this reference position. Using this readout from the computer, the correct stereotactic coordinate can be set directly. Results: Bench testing was performed to compare the accuracy of the optically guided system with that of a floor-stand system, that can be considered an absolute reference. This testing showed that coordinate localization using the IRLED system to track translations agreed with the absolute to within 0.1 ± 0.1 mm. As rotations for noncoplanar couch angles were included, the inaccuracy was increased to 0.2 ± 0.1 mm. Conclusions: IRLED technology improves the accuracy of patient localization relative to the linac isocenter in comparison with conventional couch-mounted systems. Further, the patient’s position can be monitored in real time as the couch is rotated for all treatment angles. Thus, any errors introduced by couch inaccuracies can be detected and corrected.

Stereotactic radiosurgery

Accuracy

Linear accelerator

Localization

Radiotherapy

Details

Title: Subtitle: IRLED-Based Patient Localization for Linac Radiosurgery
Creators: Sanford L Meeks - Department of Neurosurgery, University of Florida College of Medicine, Gainesville, FL 32610 USA
Francis J Bova - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, FL 32610, USA
William A Friedman - Department of Neurosurgery, University of Florida College of Medicine, Gainesville, FL 32610 USA
John M Buatti - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, FL 32610, USA
Russell D Moore - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, FL 32610, USA
William M Mendenhall - Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, FL 32610, USA
Resource Type: Journal article
Publication Details: International journal of radiation oncology, biology, physics, Vol.41(2), pp.433-439
DOI: 10.1016/S0360-3016(98)00040-6
PMID: 9607362
NLM abbreviation: Int J Radiat Oncol Biol Phys
ISSN: 0360-3016
eISSN: 1879-355X
Publisher: Elsevier Inc
Language: English
Date published: 1998
Academic Unit: Radiation Oncology; Neurosurgery; Otolaryngology
Record Identifier: 9984040446902771

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