RECENT DEVELOPMENT AND USEFULNESS OF INFRARED ENDOSCOPIC SYSTEM FOR DIAGNOSIS OF GASTRIC CANCER

  • ISHIHARA Ryu
    Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • UEDO Noriya
    Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • IISHI Hiroyasu
    Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • OGIYAMA Syuji
    Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • YAMADA Takuya
    Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • HIGASHINO Koji
    Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • NARAHARA Hiroyasu
    Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • TATSUTA Masaharu
    Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases
  • ISEKI Kazushige
    Iseki Clinic
  • ISHIGURO Shingo
    Department of Pathology, Osaka Medical Center for Cancer and Cardiovascular Diseases

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Other Title
  • 赤外線電子内視鏡の進歩と胃癌診断における有用性の検討

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Abstract

Near-infrared rays, because of its limited scattering characteristics and low absorption by water and hemoglobin, can penetrate deeply into tissue. Using infrared rays, we have developed an infrared electronic endoscope system and evaluated its usefulness for assessing the depth of involvement of gastric cancers. Recently, we developed a new infrared videoendoscopic system (dual wave-length system). With this system, we can recognize submucosal vessels of gastric cancers in a greater detail with higher resolution under IR light. A total of 30 patients with depressed gastric cancers underwent infrared endoscopy. Twenty one (91%) of 23 intramucosal and submucosal cancers less than 1, 000um were observed as tumors with no stain or faint stain, whereas all (100%) of 7 more invasive cancers were observed as tumors with dense stain or pooling of the dye. Thus, the over all accuracy was 93% (28 of 30 tumors). Moreover, 95% (18 of 19) of tumors with ulcerative changes were correctly diagnosed. New infrared electronic endoscopic system is useful for diagnosing the depth of involvement of early gastric cancer either with or without ulcerative changes. This system will bring us further development in the diagnosis of gastric cancer.

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