After being informed about the study and potential risks, all participants giving written consent will undergo conventional transabdominal ultrasound and Contrast-Enhanced Ultrasound of the bowel wall with measurement of the bowel wall thickness. In addition a continuous video sequence during Contrast-Enhanced Ultrasound is recorded and perfusion kinetics from the video clips are analyzed using a specific quantification software.
The purpose of this study is to investigate differences of the bowel wall thickness visible in conventional ultrasound and bowel perfusion using quantitative Contrast-Enhanced Ultrasound in patients with Crohn´s disease in comparison with healthy controls and patients with food allergy.