Improvement in the visibility of colorectal polyps by using blue laser imaging (with video)

Yoshida, Naohisa; Hisabe, Takashi; Hirose, Ryohei; Ogiso, Kiyoshi; Inada, Yutaka; Konishi, Hideyuki; Yagi, Nobuaki; Naito, Yuji; Aomi, Yoshiaki; Ninomiya, Kazeo; Ikezono, Go; Terasawa, Masaaki; Yao, Kenshi; Matsui, Toshiyuki; Yanagisawa, Akio; Itoh, Yoshito

doi:10.1016/j.gie.2015.01.030

Cited by 78 publications

(62 citation statements)

References 18 publications

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“…In this study, only a small segment of video from the whole colonoscopic observation was used and we could control many factors including withdrawal speed and bowel preparation. We have previously reported video studies similar to this study 16 25 . One of our studies showed that the previous NBI system (EVIS LUCERA Spectrum system) did not increase polyp visibility and a more recent NBI system (EVIS LUCERA Elite system) increased polyp visibility 25 .…”

Section: Discussionsupporting

confidence: 73%

“…Three videos were recorded for a polyp under the same conditions if possible about the presence of fluid, the amount of insufflation, and the withdrawal speed. Polyp visibility was evaluated using a published polyp visibility score 16 ranging from Score 4 to Score 1. Score 4 indicates excellent visibility; it is easy to detect a polyp.…”

Section: Methodsmentioning

confidence: 99%

“…There were two modes of narrow-band imaging observation in that system: blue laser imaging (BLI; Fujifilm Co., Tokyo, Japan) mode and BLI-bright mode 12 13 14 15 . Previously, we have reported that BLI-bright improved polyp visibility compared with WL using recorded polyp videos 16 . To make a polyp more visible is considered to be one of the most important factors related to efficient polyp detection.…”

Section: Introductionmentioning

confidence: 93%

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Linked color imaging improves the visibility of colorectal polyps: a video study

et al. 2017

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Background/study aim Linked color imaging (LCI) by a laser endoscope (Fujifilm Co, Tokyo, Japan) is a novel narrow band light observation. In this study, we aimed to investigate whether LCI could improve the visibility of colorectal polyps using endoscopic videos. Patients and methods We prospectively recorded videos of consecutive polyps 2 – 20 mm in size diagnosed as neoplastic polyps. Three videos, white light (WL), blue laser imaging (BLI)-bright, and LCI, were recorded for each polyp by one expert. After excluding inappropriate videos, all videos were evaluated in random order by two experts and two non-experts according to a published polyp visibility score from four (excellent visibility) to one (poor visibility). Additionally, the relationship between polyp visibility scores in LCI and various clinical characteristics including location, size, histology, morphology, and preparation were analyzed compared to WL and BLI-bright. Results We analyzed 101 colorectal polyps (94 neoplastic) in 66 patients (303 videos). The mean polyp size was 9.0 ± 8.1 mm and 54 polyps were non-polypoid. The mean polyp visibility scores for LCI (2.86 ± 1.08) were significantly higher than for WL and BLI-bright (2.53 ± 1.15, P < 0.001; 2.73 ± 1.47, P < 0.041). The ratio of poor visibility (score 1 and 2) was significantly lower in LCI for experts and non-experts (35.6 %, 33.6 %) compared with WL (49.6 %, P = 0.015, 50.5 %, P = 0.046). The polyp visibility scores for LCI were significantly higher than those for WL for all of the factors. With respect to the comparison between BLI-bright and WL, the polyp visibility scores for BLI-bright were not higher than WL for right-sided location, < 10 mm size, sessile serrated adenoma and polyp histology, and poor preparation. For those characteristics, LCI improved the lesions with right-sided location, SSA/P histology, and poor preparation significantly better than BLI. Conclusions LCI improved polyp visibility compared to WL for both expert and non-expert endoscopists. It is useful for improving polyp visibility in any location, any size, any morphology, any histology, and any preparation level.

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Section: Discussionsupporting

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

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Linked color imaging improves the visibility of colorectal polyps: a video study

et al. 2017

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“…The evaluation of lesion visibility was performed using the following published polyp visibility scores [16,17]. Thus, score 4 is excellent visibility (easily detectable).…”

Section: Methodsmentioning

confidence: 99%

“…The 4 phases of the evaluation (polyp visibility score 1-4) related to endoscopic figures and videos were used as ordered-categorical variables and the Wilcoxon signed-rank test was used to compare methods (i.e., A5 + CE3 and A3 + CE0). Polyp visibility scores are ordered-categorical variables but were reported as the mean value ± SD in accordance with the previous report [16,17]. Inter-observer agreement for polyp visibility scores was determined by the quadratic-weighted kappa coefficient of Cohen.…”

Section: Statistical Assessmentmentioning

confidence: 99%

High Enhancement Settings for White Light Observation Improves Colorectal Polyp Visibility in Color Difference Value and an Endoscopist’s Visibility

et al. 2018

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Background/Aims: Settings of structure and color enhancement (CE) change view of white light imaging and a preset low enhancement setting is used regularly. The aim of this study was to investigate whether higher enhancement settings increased colorectal lesions’ visibility with endoscopists’ visibility scoring and objective color difference (CD) value. Methods: From April 2015 to September 2015, we analyzed 27 pictures and 100 videos of colorectal lesions. Combinations of structure enhancement (B3, A3, A5) and CE (CE 0, 1, 3) were evaluated and CD values of 2 corresponding modes (high enhancement: A5 + CE3, preset low enhancement: A3 + CE0) were calculated using marketed software. In the video, these 2 modes were evaluated. All pictures and movies were graded by 4 endoscopists using visibility scores: score 4 (excellent) to score 1 (poor). Results: The scores of A3 + CE0 (2.74 ± 1.09) were significantly lower than those of all other higher enhancement settings such as B3 + CE1 (3.11 ± 1.08), A3 + CE1 (3.33 ± 0.91), and A5 + CE3 (3.56 ± 0.74; p < 0.001). The CD value of A5 + CE3 was significantly higher than A3 + CE0 (20.2 ± 6.9 vs. 12.9 ± 5.6, p < 0.001). In the video, the scores for A5 + CE3 were significantly higher than A3 + CE0 (3.27 ± 0.83 vs. 2.53 ± 1.05, p < 0.001). Conclusions: Higher enhancement settings increased visibility of colorectal lesions.

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Validation of simplified classification of magnifying endoscopy for diagnosis of Barrett's dysplasia with blue laser imaging

Chen

Lin

Wang

et al. 2020

Adv in Digestive Medicine

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A new simplified classification of magnifying endoscopy for diagnosis of Barrett's dysplasia has been developed by Barrett's international narrow band imaging group. Further validation is needed to investigate its feasibility. The aim of our study was to evaluate the inter-observer agreement, accuracy, sensitivity, and specificity for the new classification system with a novel blue laser imaging modality. Total of 12 endoscopists (6 more experienced and 6 less experienced) from five medical centers in Taiwan joined this endoscopic training program, which was composed of three sessions: pretest, educational, and post-test. A set of 80 endoscopic images with non-dysplastic or dysplastic Barrett lesions was used for these tests. All raters were asked to predict presence or absence of dysplasia based on the newly developed classification after an educational module. The overall inter-observer agreement (κ value) before and after the educational module were 0.4419 and 0.5573. The inter-observer agreement before and after training were 0.5471 and 0.5837 in more experienced group, 0.3625 and 0.5499 in less experienced group, respectively. The overall accuracy, sensitivity, and specificity values before and after training did not change significantly, except for increased specificity in more experienced group from 0.7083 to 0.7526. Our validation study for diagnosis of Barrett's dysplasia by using simplified classification with blue laser imaging showed moderate inter-observer agreement and good accuracy. After an educational module, inter-observer agreement in both groups and specificity in more experienced group got improved in a different scale.

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Improvement in the visibility of colorectal polyps by using blue laser imaging (with video)

Cited by 78 publications

References 18 publications

Linked color imaging improves the visibility of colorectal polyps: a video study

Linked color imaging improves the visibility of colorectal polyps: a video study

High Enhancement Settings for White Light Observation Improves Colorectal Polyp Visibility in Color Difference Value and an Endoscopist’s Visibility

Validation of simplified classification of magnifying endoscopy for diagnosis of Barrett's dysplasia with blue laser imaging

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