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When the probe is placed near superior duodenal angle the distal end of the probe comes close to the lower part of the aorta below the origin of the superior mesenteric artery and the proximal part comes close to the origin of the superior mesenteric artery and sometimes the celiac artery. In this position the proximal end of the probe is close to the aorta and the distal end of the probe is usually away from the aorta
