Diffuse reflectance spectroscopy for in vivo pediatric brain tumor detection

Area of Science:

• Medical Physics
• Oncology
• Biophotonics

Background:

• Intraoperative differentiation between pediatric brain tumors and normal brain tissue is crucial for effective tumor resection.
• Current methods may lack the precision needed for real-time surgical guidance.
• Diffuse reflectance spectroscopy (DRS) offers a potential non-invasive optical approach.

Purpose of the Study:

• To evaluate the efficacy of diffuse reflectance spectroscopy in distinguishing pediatric brain tumors from normal brain parenchyma during surgery.
• To identify specific spectral features that enable accurate tissue differentiation.
• To assess the impact of surgical probe movement on spectral data acquisition.

Main Methods:

• An in vivo human study involving 12 pediatric patients undergoing brain tumor resection.
• Acquisition of diffuse reflectance spectra from normal and tumorous brain tissue using a handheld optical probe.
• Analysis of spectral data, including mean spectrum calculation and statistical methods to identify differentiating features and quantify motion-induced variations.

Main Results:

• Diffuse reflectance spectral intensities in the 600-800 nm range effectively differentiated normal brain cortex from brain tumors.
• Probe movements during spectral acquisition introduced significant variations (increased standard deviation) in spectral intensities, particularly between 400-600 nm.

Conclusions:

• Diffuse reflectance spectroscopy is a promising tool for intraoperative discrimination of pediatric brain tumors.
• The 600-800 nm spectral range is critical for accurate tumor margin identification.
• Minimizing probe motion is essential for reliable spectral data acquisition in surgical settings.