State-of-the-Art Endoscopic Ultrasonography of the Esophagus

Abstract

Ultrasound probes and three dimensional images are technologies on the cutting-edge of endoscopic ultrasonography. Ultrasound probes are easier to use and more accurate than standard EUS in the evaluation of the depth of the invasion in superficial esophageal carcinoma. However, the high frequency of the probe limits the depth of penetration, making the assessment of large tumors and extramural lesions difficult.
3D images were produced by the reconstruction of ultrasonographic images using a computer workstation. The probe was withdrawn via the biopsy channel of a conventional endoscope at a constant speed. The images were recorded on video, and, following the examination, 3D displays of the lesion were produced. Our system provides surface image (by the Phong shading method) and section images. We can visualize any section and determine the position of the probe image in relation to the surface image. These new diagnostic methods will become clinically available in the near future.