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Updated: Jul 16, 2026
A Method for High Fidelity Optogenetic Control of Individual Pyramidal Neurons In vivo
Published on: September 2, 2013
A novel robotic laser ablation system for precision neurosurgery with intraoperative 5-ALA-induced PpIX fluorescence
Masafumi Noguchi1, Eisuke Aoki, Daiki Yoshida
1Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. masamasa@miki.pe.u-tokyo.ac.jp
Abstract:
We developed a combined system of tumor detection by 5-ALA-induced PpIX fluorescence and precise ablation by micro laser for the first time, with an automatic focusing and robotic scanning mechanism for the brain surface. 5-ALA accumulates on tumors to be metabolized to become PpIX that is a fluorescent. Intra-operative detection of 5-ALA induced PpIX fluorescence provides useful information for tumor detection. The wavelength of the micro laser is 2.8 microm close to the absorption band of water. This laser is effective only on the surface of brain tissue, enabling precise ablation at the boundary between tumor and normal tissue identified by intra-operative 5-ALA induced fluorescence. Combination tests of the fluorescence measurement and the laser ablation were performed, and it was possible to extract the area with fluorescence appropriately from the measurement data, and the micro laser with automatically scanning selectively ablated the extracted area.
Insights
This study introduces a novel system for brain tumor removal, combining 5-aminolevulinic acid (5-ALA) induced fluorescence for tumor detection with precise micro-laser ablation for enhanced surgical outcomes.
Area of Science:
- Neurosurgery
- Biomedical Engineering
- Optical Imaging
Background:
- Accurate intraoperative tumor detection is crucial for effective brain tumor resection.
- Current methods may struggle with precise delineation of tumor margins, especially at the brain surface.
Purpose of the Study:
- To develop and evaluate a novel combined system for simultaneous brain tumor detection and precise ablation.
- To utilize 5-aminolevulinic acid (5-ALA) induced protoporphyrin IX (PpIX) fluorescence for tumor visualization.
- To employ a micro-laser system for targeted tissue ablation at the tumor-normal tissue interface.
Main Methods:
- Development of a system integrating 5-ALA fluorescence detection with a robotic micro-laser ablation mechanism.
- Utilizing a 2.8 micrometer wavelength micro-laser, targeting water absorption for superficial ablation.
- Implementing an automatic focusing and robotic scanning system for brain surface navigation.
Main Results:
- Demonstrated successful extraction of fluorescent tumor areas from measurement data.
- Achieved selective ablation of identified fluorescent regions using the automatically scanning micro-laser.
- Validated the system's capability for precise ablation at the tumor boundary.
Conclusions:
- The combined 5-ALA fluorescence and micro-laser ablation system offers a promising approach for precise brain tumor resection.
- This technology enables enhanced intraoperative tumor delineation and targeted removal, potentially improving patient outcomes.
