In radiation therapy, respiratory gating is a common method to deal with the problem of breathing movement: https://www.oncolink.org/cancer-treatment/radiation/

In radiation therapy, respiratory gating is a common method to deal with the problem of breathing movement: https://www.oncolink.org/cancer-treatment/radiation/support/respiratory-motion-management-devices-respiratory-gating-dibh-abdominal-compression-surface-imaging https://www.oncolink.org/cancer-treatment/radiation/support/... I was not aware of respiratory gating being used in SWL. So, I did a brief search and saw that the efficacy of gating had definitely changed over the years: https://pubmed.ncbi.nlm.nih.gov/7858616/ https://pubmed.ncbi.nlm.nih.gov/7858616/ (1994) https://pubmed.ncbi.nlm.nih.gov/22471349/ https://pubmed.ncbi.nlm.nih.gov/22471349/ (2012) https://pubmed.ncbi.nlm.nih.gov/38515108/ https://pubmed.ncbi.nlm.nih.gov/38515108/ (2024) So, it looks like that engineering problem has been worked on a lot since that talk in 2003.