| 特集名 | 超音波内視鏡の基本 | |
|---|---|---|
| 題名 | 大腸疾患に対する超音波検査の基本 --超音波内視鏡および細径プローブを用いて | |
| 発刊年月 | 1999年 05月 | |
| 著者 | 超 栄済 | 京都第二赤十字病院消化器科 |
| 【 要旨 】 | 大腸領域で現在EUSに使用されている機種は，専用機種の超音波内視鏡と細径プローブである．使用に当たっては両機種の特徴を知って選択し，診断可能な超音波画像を得る必要がある．簡便さを重視して細径プローブのみに依存すれば，症例によっては詳細な診断が不可能となる．診断に耐えうる超音波像を描出するためには上級機種の超音波内視鏡を積極的に使用しなければならない．EUSは，壁断面が連続的に観察できるため大腸疾患の病態には不可欠な検査法である．対象病変に対するEUSの目的を理解して，明瞭な再現性のある超音波像を描出することが重要である． | |
| Theme | Endoscopic Ultrasonography | |
|---|---|---|
| Title | EUS for Colorectal Diseases Using Echocolonoscope and Miniature Probe | |
| Author | Eisai Chou | Department of Gastroenterology, Kyoto Second Red Cross Hospital |
| [ Summary ] | EUS, for colorectal lesions, has been performed with either echocolonoscopes or miniature probes. The most advanced echocolonoscope (CF-UMQ230) is an endviewing videoscope with a frequency switchable either to 7.5 or 20MHz and with 300-degree scanning angle. The miniature probe (UM-3R) has an external diameter of 2.5mm, with a frequency of 20MHz and produces 360-degree images with a radial scan. Distinct ultrasonic images can be obtained by using an echocolonoscope in comparison with miniature probes. However, there are some technical difficulties in obtaining clear ultrasound images in stenotic or small tumorous lesions, because the echocolonoscope is of a large caliber (17.5mm) and also has no direct endoscopic view of the target lesions during ultrasonography. On the other hand, miniature probes have been developed as easily manipulated devices, which can pass through the biopsy channel of a standard colonoscope. As a valuable diagnostic method for treating colorectal diseases, EUS must be performed to produce clear images, using either, or both of these ultrasonic tools. |
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