Research Report
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World J Gastroenterol. Apr 14, 2014; 20(14): 4050-4058
Published online Apr 14, 2014. doi: 10.3748/wjg.v20.i14.4050
Clinical study using novel endoscopic system for measuring size of gastrointestinal lesion
Kiyoshi Oka, Takeshi Seki, Tomohiro Akatsu, Takao Wakabayashi, Kazuo Inui, Junji Yoshino
Kiyoshi Oka, OK Fiber Technology Co., Ltd., Kizugawa-shi 619-0215, Kyoto, Japan
Takeshi Seki, Graduate School of engineering and Resource Science, Akita University, Akita-shi 010-8502, Akita, Japan
Tomohiro Akatsu, A-tech Co. Ltd., Tokai-mura 319-1116, Ibaraki, Japan
Takao Wakabayashi, Kazuo Inui, Junji Yoshino, Department of Internal Medicine, Banbuntane Hotokukai Hospital, Fujita Health University, Nagoya-shi 454-8509, Aichi, Japan
Author contributions: Oka K, Seki T and Akatsu T researched and developed a lesion size measurement system and also performed the basic experiments; Wakabayashi T, Inui K and Yoshino J performed the clinical study using the measurement system; Oka K and Seki T wrote the manuscript; Wakabayashi T, Inui K and Yoshino J involved in editing the manuscript.
Supported by The Special Coordination Fund (SCF) for Promoting Science and Technology commissioned by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
Correspondence to: Kiyoshi Oka, PhD, OK Fiber Technology Co., Ltd., 8-1-7 Umemidai, Kizukawa-shi 619-0215, Kyoto, Japan. oka@okft.co.jp
Telephone: +81-774-718358  Fax: +81-774-718357
Received: September 6, 2013
Revised: November 6, 2013
Accepted: January 2, 2014
Published online: April 14, 2014
Processing time: 220 Days and 1.3 Hours
Core Tip

Core tip: Our suggested system, which combines a conventional endoscope, several optical devices and a personal computer, can measure a lesion size by superimposing a grid scale on an image of the lesion and adjusting the width adequately according to the distance between the tip of the endoscope and the target lesion. Endoscopists can measure lesions by comparing the size of the grid scale with the size of the lesion on the monitor. After a basic performance test, the first clinical study for 3 colon polyps was performed. In the clinical study, we confirmed that our measurement system obtained a measurement accuracy of ± 1 mm when the tilt angle of the endoscope was less than 20°.