44 research outputs found
Photoacoustic ultrasound sources from diffusion-limited aggregates
Metallic diffusion-limited aggregate (DLA) films are well-known to exhibit
near-perfect broadband optical absorption. We demonstrate that such films also
manifest a substantial and relatively material-independent photoacoustic
response, as a consequence of their random nanostructure. We theoretically and
experimentally analyze photoacoustic phenomena in DLA films, and show that they
can be used to create broadband air- coupled acoustic sources. These sources
are inexpensive and simple to fabricate, and work into the ultrasonic regime.
We illustrate the device possibilities by building and testing an
optically-addressed acoustic phased array capable of producing virtually
arbitrary acoustic intensity patterns in air.Comment: 5 pages, 5 figure
Towards Safe and Collaborative Robotic Ultrasound Tissue Scanning in Neurosurgery
Intraoperative ultrasound imaging is used to facilitate safe brain tumour resection. However, due to challenges with image interpretation and the physical scanning, this tool has yet to achieve widespread adoption in neurosurgery. In this paper, we introduce the components and workflow of a novel, versatile robotic platform for intraoperative ultrasound tissue scanning in neurosurgery. An RGB-D camera attached to the robotic arm allows for automatic object localisation with ArUco markers, and 3D surface reconstruction as a triangular mesh using the ImFusion Suite software solution. Impedance controlled guidance of the US probe along arbitrary surfaces, represented as a mesh, enables collaborative US scanning, i.e., autonomous, teleoperated and hands-on guided data acquisition. A preliminary experiment evaluates the suitability of the conceptual workflow and system components for probe landing on a custom-made soft-tissue phantom. Further assessment in future experiments will be necessary to prove the effectiveness of the presented platform
Methods for Domain-Independent Information Extraction from the Web: An Experimental Comparison
Our KNOWITALL system aims to automate the tedious process of extracting large collections of facts (e.g., names of scientists or politicians) from the Web in an autonomous, domain-independent, and scalable manner. In its firs