Back to Search
Start Over
Optimising the Materials of a FUS Transducer Sized for Robotic Delivery
- Source :
- 2021 IEEE International Ultrasonics Symposium (IUS).
- Publication Year :
- 2021
- Publisher :
- IEEE, 2021.
-
Abstract
- A virtual prototype focussed ultrasound surgery (FUS) transducer has been developed with finite element analysis (FEA) (OnScale, Redwood City, CA, USA) comprising a single piezocermic element and an acoustic Fresnel lens. The piezoceramic is supported by microbaloon filled epoxy to approximate an air backing. The transducer housing and Fresnel lens materials are photopolymer resins of the type used in mask stereolithography (mSLA) printers. The design is optimised in FEA for the materials used in the Fresnel lens and the active piezoceramic layer. Six piezoceramic materials produced by Meggitt A/S (Kvistgaard, Denmark) were characterised in FEA and the acoustic properties of the photopolymer resins were measured using a standard pulse-echo approach to find their sound speed and frequency-dependent attenuation. The piezoceramic materials characterised spanned four major types: soft (PZ29); hard (PZT4); a specialised composition for high intensity focused ultrasound (HIFU) (PZ54); and low acoustic impedance, porous (PZ36HD). Acoustic impedance matching between the active material and the lens allowed the porous piezoceramic with lower piezoelectric and coupling coefficients to reach a higher intensity, spatial peak temporal average, (I SPTA ) at the focus (3.6 kWcm−2) than the hard PZT (2.46 kWcm−2). The focal intensity improved when HIFU and soft PZT were used, producing 5.69 kWcm−2 and 6.35 kWcm−2respectively.
Details
- Database :
- OpenAIRE
- Journal :
- 2021 IEEE International Ultrasonics Symposium (IUS)
- Accession number :
- edsair.doi...........8631966fad41d756acc260bf4a14d6d3
- Full Text :
- https://doi.org/10.1109/ius52206.2021.9593530