3D imaging of fistulas offers a significant advantage over conventional 2D ultrasound. Identifying the fistulas internal opening and following its tracts are nearly impossible with 2D imaging.
A high resolution 3D data acquisition takes approx. 30 seconds with the 2052 transducer. If an external opening is identified, some doctors introduce hydrogen peroxide H2O2 (3–5%) into the opening immediately before acquiring a 3D data set. During this short period, the H2O2 enhances the fistula tracts so that they appear as bright white structures on the ultrasound image. Aerated and diluted lidocaine gel may also be introduced in an external opening as an ultrasound enhancing medium.