| [ Summary ] |
Endoscopic ultrasonography was developed in the 1980s, and now is widely used. In this article, the nature of ultrasound is defined, wave length and frequency, attenuation, and reflection are described. A also the basic principle of the ultrasonograph is explained.
Moreover the resolution of endoscopic ultrasonography is descraibed in its therr direction as axial resolution, lateral resolution, and special resolution. It is highly recommended for the physicians to know the fundamentals and physics of Endoscopic ultasonography, before the clinical usage. |