Abstract
A new proto type EUS (XGF-UM20 20MHz) has been tested in gastroenterological diseases between November 1994 and October 1995. This EUS has switchable 20MHz and 7.5MHz transducer. The operation and appearance is of the same as GF-UM20. Using the 20MHz of XGF-UM20, gastroenterological diseases were revealed more fine, and clear, as compared with the image of GF-UM20 (12MHz) and stomach wall were detected as 9-layer structure under successful condition. The layer of muscularis mucosae can be shown 66.7% in gastric lesions. The diagnostic accuracy for diagnosing the depth of cancer invasion was 84.6% in early gastric cancers. Misdiagnosed cases were all depressed type of early gastric cancers. The penetration depth of ultrasound was not sufficient for advanced gastric cancers, because of extensive attenuation. The 20MHz of XGF-UM20 is considerd to be useful for diagnosing flat and small leions, especially in case with early cancer.
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