Presentation Information
[INTS5-6]Yellow Enhancement Mode Improves Vascular Visualization in Laparoscopic Colorectal Surgery: Quantitative Image Analysis and Implications for Surgical Education
*Kohei Shigeta1 (1. Department of Surgery, Keio University School of Medicine, Japan)
[Background] Precise vascular identification is critical for safe laparoscopic colorectal surgery, particularly in adipose-rich operative fields where conventional white-light imaging provides limited tissue contrast. Yellow Enhancement (YE) mode is a real-time digital imaging technology developed to selectively amplify yellow color components. However, its quantitative impact on vessel visualization has not been objectively characterized.
[Methods] A retrospective paired image analysis was conducted in 10 consecutive patients undergoing laparoscopic colorectal resection at our institution. Paired images under white-light imaging and YE mode were obtained from identical surgical scenes during perivascular dissection. Regions of interest were defined for vascular structures and adjacent adipose tissue. Color parameters in the CIELAB color space (L*, a*, b*) were measured, and contrast-to-noise ratio (CNR) and color difference (ΔE) were calculated. A total of 52 surgical scenes yielding 87 vascular observations (41 arterial, 46 venous) were analyzed.
[Results] YE mode significantly increased CNR in the b* channel compared with white-light imaging (7.82 ± 3.87 vs. 4.44 ± 3.04; p < 0.001). ΔE was also significantly higher under YE mode (63.27 ± 15.51 vs. 26.52 ± 10.40; p < 0.001), indicating enhanced color separation between vessels and surrounding tissue. These effects were consistent across both arterial and venous structures and were reproducible at the patient level. Luminance-based contrast ratio showed no significant difference (p = 0.17), confirming that YE mode selectively enhances chromatic rather than brightness contrast. Questionnaire results from young surgeons demonstrated improved subjective visibility and anatomical clarity under YE mode, consistent with quantitative findings.
[Conclusion] YE mode significantly enhances vascular-tissue contrast through selective chromatic modulation along the yellow-blue axis, without additional procedural burden.
[Methods] A retrospective paired image analysis was conducted in 10 consecutive patients undergoing laparoscopic colorectal resection at our institution. Paired images under white-light imaging and YE mode were obtained from identical surgical scenes during perivascular dissection. Regions of interest were defined for vascular structures and adjacent adipose tissue. Color parameters in the CIELAB color space (L*, a*, b*) were measured, and contrast-to-noise ratio (CNR) and color difference (ΔE) were calculated. A total of 52 surgical scenes yielding 87 vascular observations (41 arterial, 46 venous) were analyzed.
[Results] YE mode significantly increased CNR in the b* channel compared with white-light imaging (7.82 ± 3.87 vs. 4.44 ± 3.04; p < 0.001). ΔE was also significantly higher under YE mode (63.27 ± 15.51 vs. 26.52 ± 10.40; p < 0.001), indicating enhanced color separation between vessels and surrounding tissue. These effects were consistent across both arterial and venous structures and were reproducible at the patient level. Luminance-based contrast ratio showed no significant difference (p = 0.17), confirming that YE mode selectively enhances chromatic rather than brightness contrast. Questionnaire results from young surgeons demonstrated improved subjective visibility and anatomical clarity under YE mode, consistent with quantitative findings.
[Conclusion] YE mode significantly enhances vascular-tissue contrast through selective chromatic modulation along the yellow-blue axis, without additional procedural burden.