Blue laser imaging and linked color imaging improve the color difference value and visibility of colorectal polyps in underwater conditions

Yasushi Yamasaki, Keita Harada, Shumpei Yamamoto, Eriko Yasutomi, Shotaro Okanoue, Mami Hirai, Shohei Oka, Yuka Obayashi, Hiroyuki Sakae, Kenta Hamada, Toshihiro Inokuchi, Hideaki Kinugasa, Yuusaku Sugihara, Masahiro Takahara, Takehiro Tanaka, Sakiko Hiraoka, Yoshiro Kawahara, Hiroyuki Okada

Research output: Contribution to journalArticle

Abstract

OBJECTIVES: Underwater endoscopic mucosal resection (UEMR) has become widespread for treating colorectal polyps. However, which observational mode is best suited for determining polyp margins underwater remains unclear. To determine the best mode, we analyzed three imaging modes: white light imaging (WLI), blue laser imaging (BLI) and linked color imaging (LCI).

METHODS: Images of consecutive colorectal polyps previously examined via these three modes before UEMR were analyzed according to the degree of turbidity underwater (transparent or cloudy). Color differences between the polyps and their surroundings were calculated using the Commission Internationale d'Eclairage Lab color space in which three-dimensional color parameters were expressed. Eight evaluators, who were blinded to the histology, scored the visibility from one (undetectable) to four (easily detectable) in both underwater conditions. The color differences and visibility scores were compared.

RESULTS: Seventy-three polyps were evaluated. Sixty-one polyps (44 adenomatous, 17 serrated) were observed under transparent conditions, and 12 polyps (7 adenomatous, 5 serrated) were observed under cloudy conditions. Under transparent conditions, the color differences for the BLI (8.5) and LCI (7.9) were significantly higher than that of the WLI (5.7; P <.001). The visibility scores for the BLI (3.6) and LCI (3.4) were also higher than that of the WLI (3.1; P<.0001). Under cloudy conditions, the visibility scores for LCI (2.9) and WLI (2.7) were significantly higher than that of the BLI (2.2; P<.0001 and P=0.04, respectively).

CONCLUSIONS: BLI and LCI were the better observational modes in transparent water; however, BLI was unsuitable for cloudy conditions.

Original languageEnglish
JournalDigestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society
Early online dateNov 23 2019
DOIs
Publication statusE-pub ahead of print - Nov 23 2019
Externally publishedYes

Fingerprint

Polyps
Lasers
Color
Adenomatous Polyps
Light
Histology
Water

Keywords

  • blue laser imaging
  • color difference
  • colorectal polyp
  • linked color imaging
  • underwater

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Gastroenterology

Cite this

Blue laser imaging and linked color imaging improve the color difference value and visibility of colorectal polyps in underwater conditions. / Yamasaki, Yasushi; Harada, Keita; Yamamoto, Shumpei; Yasutomi, Eriko; Okanoue, Shotaro; Hirai, Mami; Oka, Shohei; Obayashi, Yuka; Sakae, Hiroyuki; Hamada, Kenta; Inokuchi, Toshihiro; Kinugasa, Hideaki; Sugihara, Yuusaku; Takahara, Masahiro; Tanaka, Takehiro; Hiraoka, Sakiko; Kawahara, Yoshiro; Okada, Hiroyuki.

In: Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society, 23.11.2019.

Research output: Contribution to journalArticle

Yamasaki, Yasushi ; Harada, Keita ; Yamamoto, Shumpei ; Yasutomi, Eriko ; Okanoue, Shotaro ; Hirai, Mami ; Oka, Shohei ; Obayashi, Yuka ; Sakae, Hiroyuki ; Hamada, Kenta ; Inokuchi, Toshihiro ; Kinugasa, Hideaki ; Sugihara, Yuusaku ; Takahara, Masahiro ; Tanaka, Takehiro ; Hiraoka, Sakiko ; Kawahara, Yoshiro ; Okada, Hiroyuki. / Blue laser imaging and linked color imaging improve the color difference value and visibility of colorectal polyps in underwater conditions. In: Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society. 2019.
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abstract = "OBJECTIVES: Underwater endoscopic mucosal resection (UEMR) has become widespread for treating colorectal polyps. However, which observational mode is best suited for determining polyp margins underwater remains unclear. To determine the best mode, we analyzed three imaging modes: white light imaging (WLI), blue laser imaging (BLI) and linked color imaging (LCI).METHODS: Images of consecutive colorectal polyps previously examined via these three modes before UEMR were analyzed according to the degree of turbidity underwater (transparent or cloudy). Color differences between the polyps and their surroundings were calculated using the Commission Internationale d'Eclairage Lab color space in which three-dimensional color parameters were expressed. Eight evaluators, who were blinded to the histology, scored the visibility from one (undetectable) to four (easily detectable) in both underwater conditions. The color differences and visibility scores were compared.RESULTS: Seventy-three polyps were evaluated. Sixty-one polyps (44 adenomatous, 17 serrated) were observed under transparent conditions, and 12 polyps (7 adenomatous, 5 serrated) were observed under cloudy conditions. Under transparent conditions, the color differences for the BLI (8.5) and LCI (7.9) were significantly higher than that of the WLI (5.7; P <.001). The visibility scores for the BLI (3.6) and LCI (3.4) were also higher than that of the WLI (3.1; P<.0001). Under cloudy conditions, the visibility scores for LCI (2.9) and WLI (2.7) were significantly higher than that of the BLI (2.2; P<.0001 and P=0.04, respectively).CONCLUSIONS: BLI and LCI were the better observational modes in transparent water; however, BLI was unsuitable for cloudy conditions.",
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T1 - Blue laser imaging and linked color imaging improve the color difference value and visibility of colorectal polyps in underwater conditions

AU - Yamasaki, Yasushi

AU - Harada, Keita

AU - Yamamoto, Shumpei

AU - Yasutomi, Eriko

AU - Okanoue, Shotaro

AU - Hirai, Mami

AU - Oka, Shohei

AU - Obayashi, Yuka

AU - Sakae, Hiroyuki

AU - Hamada, Kenta

AU - Inokuchi, Toshihiro

AU - Kinugasa, Hideaki

AU - Sugihara, Yuusaku

AU - Takahara, Masahiro

AU - Tanaka, Takehiro

AU - Hiraoka, Sakiko

AU - Kawahara, Yoshiro

AU - Okada, Hiroyuki

N1 - © 2019 Japan Gastroenterological Endoscopy Society.

PY - 2019/11/23

Y1 - 2019/11/23

N2 - OBJECTIVES: Underwater endoscopic mucosal resection (UEMR) has become widespread for treating colorectal polyps. However, which observational mode is best suited for determining polyp margins underwater remains unclear. To determine the best mode, we analyzed three imaging modes: white light imaging (WLI), blue laser imaging (BLI) and linked color imaging (LCI).METHODS: Images of consecutive colorectal polyps previously examined via these three modes before UEMR were analyzed according to the degree of turbidity underwater (transparent or cloudy). Color differences between the polyps and their surroundings were calculated using the Commission Internationale d'Eclairage Lab color space in which three-dimensional color parameters were expressed. Eight evaluators, who were blinded to the histology, scored the visibility from one (undetectable) to four (easily detectable) in both underwater conditions. The color differences and visibility scores were compared.RESULTS: Seventy-three polyps were evaluated. Sixty-one polyps (44 adenomatous, 17 serrated) were observed under transparent conditions, and 12 polyps (7 adenomatous, 5 serrated) were observed under cloudy conditions. Under transparent conditions, the color differences for the BLI (8.5) and LCI (7.9) were significantly higher than that of the WLI (5.7; P <.001). The visibility scores for the BLI (3.6) and LCI (3.4) were also higher than that of the WLI (3.1; P<.0001). Under cloudy conditions, the visibility scores for LCI (2.9) and WLI (2.7) were significantly higher than that of the BLI (2.2; P<.0001 and P=0.04, respectively).CONCLUSIONS: BLI and LCI were the better observational modes in transparent water; however, BLI was unsuitable for cloudy conditions.

AB - OBJECTIVES: Underwater endoscopic mucosal resection (UEMR) has become widespread for treating colorectal polyps. However, which observational mode is best suited for determining polyp margins underwater remains unclear. To determine the best mode, we analyzed three imaging modes: white light imaging (WLI), blue laser imaging (BLI) and linked color imaging (LCI).METHODS: Images of consecutive colorectal polyps previously examined via these three modes before UEMR were analyzed according to the degree of turbidity underwater (transparent or cloudy). Color differences between the polyps and their surroundings were calculated using the Commission Internationale d'Eclairage Lab color space in which three-dimensional color parameters were expressed. Eight evaluators, who were blinded to the histology, scored the visibility from one (undetectable) to four (easily detectable) in both underwater conditions. The color differences and visibility scores were compared.RESULTS: Seventy-three polyps were evaluated. Sixty-one polyps (44 adenomatous, 17 serrated) were observed under transparent conditions, and 12 polyps (7 adenomatous, 5 serrated) were observed under cloudy conditions. Under transparent conditions, the color differences for the BLI (8.5) and LCI (7.9) were significantly higher than that of the WLI (5.7; P <.001). The visibility scores for the BLI (3.6) and LCI (3.4) were also higher than that of the WLI (3.1; P<.0001). Under cloudy conditions, the visibility scores for LCI (2.9) and WLI (2.7) were significantly higher than that of the BLI (2.2; P<.0001 and P=0.04, respectively).CONCLUSIONS: BLI and LCI were the better observational modes in transparent water; however, BLI was unsuitable for cloudy conditions.

KW - blue laser imaging

KW - color difference

KW - colorectal polyp

KW - linked color imaging

KW - underwater

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DO - 10.1111/den.13581

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SN - 0915-5635

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