| [ Summary ] |
By using color Doppler endoscopic ultrasonography examinations with a special endoscope, using the colored Doppler function may be performed. The principle of this method is to detect the deviations between the speed of erythrocytes and the frequency occurring in the direction of the blood stream (the Doppler phenomenon). Color-coded data is displayed in the cross-sectional images. By using this method, it is possibleto obtain colored Doppler signals, showing blood flow velocity, wave shapes, and information about diseases of the alimentary tract and the pancreatobiliary area. For example, in gastroesophageal varices, veins inside the wall and outside the wall are easily observed. This technique plays an important role in judging the therapeutic effects on these varices.In hemorrhagic gastriculcers, the blood vessels are sometimes observed at the base of the ulcer after bleeding episodes.It may also used for differential diagnosis of submucosal and other malignant tumors. |