title: New-generation narrow band imaging improves visibility of polyps: a colonoscopy video evaluation study.
abstract: BACKGROUND
  The benefits of narrow band imaging (NBI) in colorectal polyp detection remain questionable. Previous NBI has poorer brightness and resolution than white light (WL). However, recently these factors were improved by the new-generation video processor system (EVIS LUCERA ELITE) in comparison with the previous system (EVIS LUCERA SPECTRUM). The aim of this study was to investigate whether NBI with EVIS LUCERA ELITE could improve the visibility of colorectal polyps compared to WL.
  
  
  METHODS
  We analyzed prospectively 240 colorectal polyps (group 1: ELITE with CF-HQ290 scope, 80 polyps; group 2: ELITE with PCF-Q260AZI scope, 80 polyps; group 3: SPECTRUM with PCF-Q260AZI scope, 80 polyps) whose videos were recorded using NBI and WL at Kyoto Prefectural University of Medicine. The videos were evaluated in a randomized order by three experts and three non-experts. Each polyp was assigned a polyp visibility score from 4 (excellent visibility) to 1 (poor visibility). The polyp visibility scores in each mode and their relationship to the clinical characteristics were analyzed.
  
  
  RESULTS
  The mean polyp visibility scores of NBI with ELITE system were significantly higher than those of WL (ELITE with CF-HQ290: 3.14 ± 0.87 vs. 2.75 ± 0.98, p < 0.0001, ELITE with PCF-Q260AZI: 3.03 ± 0.92 vs. 2.83 ± 0.93, p = 0.0006). Conversely, the mean polyp visibility score of NBI using SPECTRUM system with PCF-Q260AZI was significantly lower than WL (2.75 ± 1.06 vs. 3.05 ± 0.92, p < 0.0001).
  
  
  CONCLUSIONS
  Our study showed that NBI using EVIS LUCERA ELITE improved polyp visibility.
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Ogiso
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan. naohisa@koto.kpu-m.ac.jp.
authors.forename: Naohisa
authors.initials: N
authors.lastname: Yoshida
authors.affiliation: Division of Molecular Gastroenterology and Hepatology, University Medicine Cluster, National University Hospital, Singapore, Singapore.
authors.forename: Kewin Tien Ho
authors.initials: KT
authors.lastname: Siah
authors.affiliation: Department of Gastroenterology, Asahi University Murakami Memorial Hospital, Gifu, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kitae
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Takaaki
authors.initials: T
authors.lastname: Murakami
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Ryohei
authors.initials: R
authors.lastname: Hirose
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Inada
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Dohi
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Okayama
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Kamada
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Uchiyama
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ishikawa
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Handa
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Konishi
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Naito
authors.affiliation: Department of Pathology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Yanagisawa
authors.affiliation: Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan.
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Itoh
mesh_terms: D000236:Adenoma / Q000000981:diagnostic imaging*; D003113:Colonoscopy / Q000295:instrumentation / Q000379:methods*; D015179:Colorectal Neoplasms / Q000000981:diagnostic imaging*; D006801:Humans; D007417:Intestinal Polyps / Q000000981:diagnostic imaging*; D062048:Narrow Band Imaging / Q000295:instrumentation / Q000379:methods*; D015588:Observer Variation; D011446:Prospective Studies; D014741:Video Recording
keywords: Colorectal polyp; Detection; Narrow band imaging; Video
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