Video: Clinical evaluation of a laparoscopic hyperspectral imaging system

Area of Science:

• Surgical Technology
• Medical Imaging
• Biomedical Engineering

Background:

• Hyperspectral imaging (HSI) offers advanced perfusion quantification and tissue discrimination during surgery.
• Previous HSI systems were limited to open surgery due to size, lack of color video, or long acquisition times.
• A novel hand-held, laparoscopic HSI camera has been developed to overcome these limitations.

Purpose of the Study:

• To clinically evaluate a new laparoscopic hyperspectral camera for perfusion quantification and tissue discrimination.
• To compare the performance of the laparoscopic HSI camera against a clinically approved HSI system for open surgery.

Main Methods:

• Gastrointestinal resectates from ten cancer patients were analyzed using the laparoscopic HSI camera.
• Reference data were acquired with a clinically approved HSI system for pixel-wise comparison.
• Image registration enabled comparison of spectral data and derived parameters (StO2, NIR PI, OHI, TWI).

Main Results:

• Mean absolute errors (MAE) for the laparoscopic system were: StO2: 11%±7%, NIR PI: 14±3, OHI: 14±5, TWI: 10±2.
• Mean root mean square error (RMSE) ranged from 0.1±0.03 (500-750 nm) to 0.15±0.06 (750-1000 nm).
• No significant correlation was found between MAE/RMSE and study design factors like white balancing time.

Conclusions:

• Qualitative parameter images from the laparoscopic system closely matched those from the open surgery system.
• Quantitative deviations were attributed to technical differences, not the study design.
• Current large-scale in vivo trials are addressing the limitations identified in this initial study.