Ringâ•'down artifacts posterior to the right hemidiaphragm on abdominal sonography: sign of pulmonary parenchymal abnormali
![Ring down artefacts on abdominal sonography to predict pulmonary abnormalities in the emergency department | Emergency Medicine Journal Ring down artefacts on abdominal sonography to predict pulmonary abnormalities in the emergency department | Emergency Medicine Journal](https://emj.bmj.com/content/emermed/22/10/747/F1.large.jpg)
Ring down artefacts on abdominal sonography to predict pulmonary abnormalities in the emergency department | Emergency Medicine Journal
![Suean Pascoe on Twitter: "4/B-lines –These are a ring down artefact which does not fade – they occur because the ultrasound beam excites liquid trapped between gas bubbles and causes the liquid Suean Pascoe on Twitter: "4/B-lines –These are a ring down artefact which does not fade – they occur because the ultrasound beam excites liquid trapped between gas bubbles and causes the liquid](https://pbs.twimg.com/media/EFgsU0tUEAEEhxs.png)