Background and purpose: The impact of respiratory motion management strategies for abdominal radiotherapy. such as abdominal compression (AC) and breath hold (BH). on abdominal organ at risk (OAR) delineation on magnetic resonance imaging (MRI) is unknown. This feasibility study compared the inter- and intra- observer delineation variation on MRI acquired with AC. https://www.roneverhart.com/Echo-Fix-EF-P2-Spring-Reverb-Pedal-p32083/