Clinical application of ultrasound 3 D imaging system in lesions of the gastrointestinal tract.
OBJECTIVE
The usefulness of the ultrasound 3 D imaging system (3 D-EUS) is reported. 3 D-EUS using an ultrasonic probe has been introduced as a result of the developments in 3 D-EUS (EU-IP) by Olympus. The 3 D-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 multifreeze, high-resolution images, measurement etc. for a definitive diagnosis.


RESULTS
In the past three years, 190 lesions of the gastrointestinal tract were examined by 3 D-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 3 D 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 3 D images. High-resolution images were more precise and finer than with plain EUS.


CONCLUSIONS
3 D-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.
Yoshimoto
K
K
Third Dept. of Internal Medicine, Toho University School of Medicine, Tokyo, Japan.
D019160:Endosonography / Q000379:methods*; D004938:Esophageal Neoplasms / Q000000981:diagnostic imaging*; D005069:Evaluation Studies as Topic; D005770:Gastrointestinal Neoplasms / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods