Abstract
Echoendoscopes are classified into radial and linear categories: the former provides circumferential US views at a right angle to the shaft of the echoendoscope, similar to CT, whereas the latter provides sector images that are in the same plane as the echoendoscope shaft. These linear images are more limited, and orientation is more difficult, compared with radial images. However, this ability to provide sector scanning allows one to trace the path of a needle as it is inserted out of the working channel of the echoendoscope.
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