{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/144904"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/144904","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Generating Gaseous Emboli Mimics in an ECMO Flow Phantom","abstract":"Patients undergoing extracorporeal membrane oxygenation (ECMO) therapy are prone to developing emboli. These unattached masses of solid blood clots and gaseous air bubbles have the potential to occlude blood vessels and lead to complications such as neurological damage. Existing ultrasound methods for detecting and characterizing them are designed and tested on data sets that often are small, are not representative of clinical conditions, or lack a ground truth to compare the results to. We aim to construct a flow phantom that fills these gaps. We build upon prior work on this project by mixing a translucent fluid that mimics the acoustic and rheological properties of blood. We explore various bubble generation designs and produce gaseous emboli mimics with diameters as small as 250 µm. In addition, we experimentally confirm a monotonic dependence between bubble diameter and peak backscattered power under no flow conditions, which can help with sizing emboli. Finally, we investigate interactions between ultrasonic acoustic waves and emboli through simulations in k-Wave. This work makes progress towards ultimately developing a well-tested Doppler ultrasound system that can detect and characterize emboli in ECMO.","abstract_html":"Patients undergoing extracorporeal membrane oxygenation (ECMO) therapy are prone to developing emboli. These unattached masses of solid blood clots and gaseous air bubbles have the potential to occlude blood vessels and lead to complications such as neurological damage. Existing ultrasound methods for detecting and characterizing them are designed and tested on data sets that often are small, are not representative of clinical conditions, or lack a ground truth to compare the results to. We aim to construct a flow phantom that fills these gaps. We build upon prior work on this project by mixing a translucent fluid that mimics the acoustic and rheological properties of blood. We explore various bubble generation designs and produce gaseous emboli mimics with diameters as small as 250 µm. In addition, we experimentally confirm a monotonic dependence between bubble diameter and peak backscattered power under no flow conditions, which can help with sizing emboli. Finally, we investigate interactions between ultrasonic acoustic waves and emboli through simulations in k-Wave. This work makes progress towards ultimately developing a well-tested Doppler ultrasound system that can detect and characterize emboli in ECMO.","abstract_has_math":false,"creators":["Liu, Sabrina"],"institution":"Massachusetts Institute of Technology","degree_name":"Master","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science","school":null,"contributors":[],"advisors":["Bourouiba, Lydia","Heldt, Thomas"],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05","date_published":"2022-05","updated_at":"2026-07-22T22:22:27Z","subjects":[],"languages":[],"rights":["In Copyright - Educational Use Permitted","Copyright MIT"],"rights_urls":["http://rightsstatements.org/page/InC-EDU/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1721.1/144904","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Bourouiba, Lydia","Heldt, Thomas"]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. 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These unattached masses of solid blood clots and gaseous air bubbles have the potential to occlude blood vessels and lead to complications such as neurological damage. Existing ultrasound methods for detecting and characterizing them are designed and tested on data sets that often are small, are not representative of clinical conditions, or lack a ground truth to compare the results to. We aim to construct a flow phantom that fills these gaps. We build upon prior work on this project by mixing a translucent fluid that mimics the acoustic and rheological properties of blood. We explore various bubble generation designs and produce gaseous emboli mimics with diameters as small as 250 µm. In addition, we experimentally confirm a monotonic dependence between bubble diameter and peak backscattered power under no flow conditions, which can help with sizing emboli. Finally, we investigate interactions between ultrasonic acoustic waves and emboli through simulations in k-Wave. This work makes progress towards ultimately developing a well-tested Doppler ultrasound system that can detect and characterize emboli in ECMO."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["M.Eng."]},{"key":"dc:title","label":"Title","values":["Generating Gaseous Emboli Mimics in an ECMO Flow Phantom"]}]}],"canonical_facts":{"dc:contributor.advisor":["Bourouiba, Lydia","Heldt, Thomas"],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science"],"dc:creator":["Liu, Sabrina"],"dc:date.accessioned":["2022-08-29T16:19:56Z"],"dc:date.available":["2022-08-29T16:19:56Z"],"dc:date.issued":["2022-05"],"dc:description.abstract":["Patients undergoing extracorporeal membrane oxygenation (ECMO) therapy are prone to developing emboli. These unattached masses of solid blood clots and gaseous air bubbles have the potential to occlude blood vessels and lead to complications such as neurological damage. Existing ultrasound methods for detecting and characterizing them are designed and tested on data sets that often are small, are not representative of clinical conditions, or lack a ground truth to compare the results to. We aim to construct a flow phantom that fills these gaps. We build upon prior work on this project by mixing a translucent fluid that mimics the acoustic and rheological properties of blood. We explore various bubble generation designs and produce gaseous emboli mimics with diameters as small as 250 µm. In addition, we experimentally confirm a monotonic dependence between bubble diameter and peak backscattered power under no flow conditions, which can help with sizing emboli. Finally, we investigate interactions between ultrasonic acoustic waves and emboli through simulations in k-Wave. This work makes progress towards ultimately developing a well-tested Doppler ultrasound system that can detect and characterize emboli in ECMO."],"dc:description.degree":["M.Eng."],"dc:identifier.uri":["https://hdl.handle.net/1721.1/144904"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["In Copyright - Educational Use Permitted","Copyright MIT"],"dc:rights.uri":["http://rightsstatements.org/page/InC-EDU/1.0/"],"dc:title":["Generating Gaseous Emboli Mimics in an ECMO Flow Phantom"],"dc:type":["Thesis"],"thesis:degree_name":["Master","Master of Engineering in Electrical Engineering and Computer Science"]},"updated_at":"2026-07-22T22:22:27Z"}