Epiq 5 machine

The IUS was performed by an ultrasonographer (E.A.v.W.) who followed the International Bowel Ultrasound curriculum prior to the start of the study and who had performed >100 IUS examinations. The ultrasonographer was unaware of the clinical details and was blinded for the results of the colonoscopy, which was the reference standard. Participants did not receive a specific bowel preparation for the IUS but were asked not to take in carbonated fluids or solid food 4 hours prior to the IUS, as is recommended by the European Society of Gastrointestinal and Abdominal Radiology and European Society of Paediatric Radiology guidelines.^{9 (link)} The IUS examinations were performed with a Philips EPIQ 5 machine (Philips Healthcare, Best, the Netherlands) using a convex probe (2-9 MHz, C9-2; Philips Healthcare) for general screening and a linear probe (4-12 MHz, L12-4; Philips Healthcare) for performing the bowel measurements. Image quality was rated as good, moderate, or bad by the ultrasonographer. Good image quality was defined as a sharp image with the bowel wall clearly visible. Moderate image quality was defined as a less clearly visible bowel wall (eg, because of small air artifacts). Bad image quality was defined as no sharp image with the bowel wall not clearly visible.