Abstract
Background and Study Aims: The usefulness of the ultrasound 3D imaging system (3D-EUS) is reported. 3D-EUS using an ultrasonic probe has been introduced as a result of the developments in 3D-EUS (EU-IP) by Olympus. The 3D-EUS image was reconstructed by composing the radial and linear images produced by 40 slices of radial image, which were obtained by spiral scanning of the ultrasonic probe in the sheath. This system also allowed numerous functions, such as multi-freeze, high-resolution images, measurement etc. for a definitive diagnosis.
Results: In the past three years, 190 lesions of the gastrointestinal tract were examined by 3D-EUS. The rate of correct approach to the lesions was 89 % (overall). The most inappropriate approach was a result of the oblique probe approach, or lesions sited in difficult positions. The radial, linear and 3D images were generally good. Pulsation, deep attenuation and small lesions caused the worst images. Most small lesions were imaged thoroughly with radial imaging and so no significant changes can be seen with 3D images. High-resolution images were more precise and finer than with plain EUS.
Conclusions: 3D-EUS contributed more useful and finer images for the EUS examinations. Gastrointestinal lesions are generally well displayed and recognizable. There are still a few problems to be solved for proper imaging, but there should be positive advances in diagnostic ability with the development of this system.
