CHARACTERIZATION OF FOCUSED ULTRASOUND BEAM GEOMETRIES USING THERMOCHROMIC LIQUID CRYSTAL FILMS

dc.contributor.advisorZhang, Li-Qunen_US
dc.contributor.authorAhmed, Nabiden_US
dc.contributor.departmentBioengineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2020-10-10T05:37:24Z
dc.date.available2020-10-10T05:37:24Z
dc.date.issued2020en_US
dc.description.abstractFocused ultrasound (FUS) applications are gaining more attention from clinicians for being able to provide effective, non-invasive treatments to almost any region of the body. In-house development of FUS devices require characterization and quality assurance methods to verify acoustic pressure fields, focal zone geometry, location, and validate proper function. Conventional techniques (hydrophones, gel phantoms) are limited by expensive and inaccessible equipment, time-consuming procedures, and use of toxic reagents. We developed a process for using thermochromic liquid crystal (TLC) films, sensors which undergo color transition when exposed to a range of specific temperatures, as a low-cost and readily adaptable characterization method for FUS transducers. A proof-of-concept experiment showed reproducibility in detecting ultrasound beams. Tests with two FUS transducers demonstrated that the technique was able to approximate axial dimensions of the focal region and depth of the focal region, characteristics that are significant in FUS treatment planning.en_US
dc.identifierhttps://doi.org/10.13016/crgf-0o0p
dc.identifier.urihttp://hdl.handle.net/1903/26623
dc.language.isoenen_US
dc.subject.pqcontrolledEngineeringen_US
dc.titleCHARACTERIZATION OF FOCUSED ULTRASOUND BEAM GEOMETRIES USING THERMOCHROMIC LIQUID CRYSTAL FILMSen_US
dc.typeThesisen_US

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