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Fluorescence Molecular Tomography for In Vivo Imaging of Glioblastoma Xenografts
Published on: April 26, 2018
Optical touch pointer for fluorescence guided glioblastoma resection using 5-aminolevulinic acid
Neda Haj-Hosseini1, Johan Richter, Stefan Andersson-Engels
1Department of Biomedical Engineering, Linköping University, Linköping 58185, Sweden. nedha@imt.liu.se
Lasers in Surgery and Medicine
|January 16, 2010
Summary
This study developed a novel optical touch pointer using fluorescence spectroscopy to differentiate glioblastoma (GBM) from healthy brain tissue during surgery. The system quantitatively detects tumor-specific fluorescence, improving intraoperative diagnosis.
Area of Science:
- Neurosurgery
- Optical Spectroscopy
- Biomedical Optics
Background:
- Glioblastoma multiforme (GBM) resection is challenging due to infiltrative growth and similarity to healthy brain tissue.
- Intraoperative diagnosis relies on subjective methods like surgical microscopy.
- Accurate differentiation of tumor margins is critical for effective treatment.
Purpose of the Study:
- To develop and evaluate a hand-held optical touch pointer for quantitative intraoperative distinction between healthy and malignant brain tissue.
- To improve the accuracy of glioblastoma resection margins.
- To provide surgeons with real-time feedback on tissue type.
Main Methods:
- A pulsed fluorescence spectroscopy system was designed for optimal energy delivery and background light suppression.
- Patients received 5-aminolevulinic acid (5-ALA) pre-surgery to enhance tumor fluorescence.
- A 405 nm laser pulse and fiber optical probe were used to detect protoporphyrin IX (PpIX) fluorescence peaks at 635 and 704 nm in GBM cells.
Main Results:
- Pulsed fluorescence spectroscopy quantitatively detected PpIX fluorescence in GBM tissue.
- The system effectively suppressed background light from operating room lamps and surgical lights.
- Distinct fluorescence signatures were observed between tumor and healthy brain tissue.
Conclusions:
- The developed optical touch pointer and fluorescence spectroscopy system enable quantitative intraoperative differentiation of GBM.
- This technology has the potential to improve the precision of glioblastoma tumor resection.
- Further clinical validation is warranted to integrate this tool into standard surgical practice.
