Abstract
Transanal ultrasound was the first technique used to directly depict the anal sphincter complex in detail. It requires a high-frequency transducer for detailed resolution, near-field focusing, and an axial 360° image to view circular sphincteric structures [1]. This is possible with a mechanically rotated single crystal, although it is a technology now considered obsolete by the majority of ultrasound manufacturers. The system uses a hard plastic cone to protect the rotating endoprobe. The outer walls of this cone are parallel, so that the probe may be moved within the anal canal without causing any anatomical distortion.
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Maconi, G., Radice, E., Santoro, G.A. (2013). Techniques. In: Tonolini, M., Maconi, G. (eds) Imaging of Perianal Inflammatory Diseases. Springer, Milano. https://doi.org/10.1007/978-88-470-2847-0_11
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DOI: https://doi.org/10.1007/978-88-470-2847-0_11
Publisher Name: Springer, Milano
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