Soon, the surface ultrasound was ready, and Yang Ping started to explore along the path of the aorta and its branches, sector by sector, searching for the ultrasonic image of the fish bone amidst the blood flow.
Yang Ping first examined the main trunk of the aorta, because the intraoperative surface ultrasound had to respect sterile principles, only examining the area not covered by the sterile drape, leaving other areas such as the abdomen unchecked.
After the examination, no fish bone was found in the thoracic aorta or the abdominal aorta's main trunk. The aorta branches off in many directions after leaving the heart, and these branches give rise to more branches. Having checked the main trunk, Yang Ping could only follow these branches to examine each supplied area one by one.