Ultrasound virtual endoscopy: Polyp detection and reliability of measurement in an in vitro study with pig intestine specimens

Figure 1 A pig intestine specimen and simulated polyps. A: A porcine intestine specimen with a flexure configuration was placed on a black sponge. One end was double-tied with sutures. A catheter used for intestinal distention during the USVE and CTC was placed through the other end. Optical colonoscopy was also performed through the latter end after removal of the catheter; B: A simulated polyp with a maximum diameter of 8 mm (arrows) was sutured to the inverted intestine specimen. USVE: Ultrasound virtual endoscopy; CTC: Computed tomography colonography.

Figure 2 The 3D endoluminal reformatted image of ultrasound virtual endoscopy clearly depicting an 8-mm polyp. We could observe the polyp on the 2D transversal, sagittal and coronal ultrasonography simultaneously.

Figure 3 Polyp size and number.

Figure 4 A 6-mm created polyp is clearly depicted on two-dimensional ultrasonography (A), ultrasound virtual endoscopy (B), computed tomography colonography (C) and optical colonoscopy (D).