Arbejde PhD scholarship in Integrated Transducers for Ultrasound Imaging Hovedstaden Danmarks Tekniske Universitet - jobtilbud

GÆLDER
stillingsbetegnelse:
PhD scholarship in Integrated Transducers for Ultrasound Imaging

jobbeskrivelse:
A multidisciplinary research project is being established in collaboration between the Department of Micro and Nanotechnology (DTU Nanotech) and the Department of Electrical Engineering (DTU Electrical Engineering) at the Technical University of Denmark aiming to develop miniaturized transducers for ultrasound imaging. Responsibilities and tasks Modern medical ultrasound imaging is made using multi-element piezoelectric transducers. Often the arrays consist of 192 elements with a spacing between elements of one or a half wavelength (?/2). Typically the frequency in ultrasound is between 3 to 15 MHz making the wavelength around 0.5 to 0.1 mm. The pitch is, thus, very small and the kerf between elements is in microns. The height of the elements is around 5-10 mm and the tall elements can be difficult to manufacture. The introduction of 2D arrays for three-dimensional imaging is increasing the problems. Here the elements are ?/2 square and the sub-dicing of the piezoelectric crystal often results in a vary low yield and expensive transducers. Also the interconnection between the elements and the transducer cables is a challenge. The current 2D arrays houses 32 x 32 elements or 64 x 64 elements. This large elements count precludes making connections to all elements and sparse arrays have to be used which impacts image quality in terms of resolution and contrast. New technology is, thus, needed for advancing ultrasound technology. Recent years has seen the development of integrated transducers based on silicon technology. Using silicon surface micromachining allows for fabrication of capacitive micromachined ultrasonic transducers (cMUT). Such cMUT transducers uses fairly standard integrated circuit fabrication technology to make very small (10-20 micron size) ultrasound transducers, which are grouped to form larger elements. Each of these devices have a thin membrane that can be actuated by electrostatic forces thus generating an ultrasound pulse. The technology is still immature and can be advanced, but the potential capabilities are large. It is here possible to fabricate any number of elements in any kind of configuration. 2D arrays with a very large array count can be made and there is also the potential to integrate switching capabilities on the die. The purpose of this project is to fabricate cMUT probes that are suitable ultrasound imaging using the DTU Danchip clean room facility and use these with the facilities at Center for Fast Ultrasound imaging's (CFU) facilities for ultrasound imaging. DTU Danchip has a state of the art cleanroom suited for fabrication of micromachined structures. CFU are experts in synthetic aperture ultrasound imaging and has the SARUS experimental ultrasound scanner, which can acquire and process data from 1024 transducer elements in real time. In synthetic aperture imaging it is possible to build up the image from several emissions and different elements can be measured from emissions to emissions. Combining all the data will significantly increase the image quality. The purpose is therefore to make cMUT probes with a large number of elements and with integrated multiplexing. These are then interfaced to the SARUS system for real-time operation and experimentation. Qualifications Candidates should have a master's degree in engineering or a similar degree with an academic level equivalent to the master's degree in engineering. Approval and Enrolment The scholarships for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide. Assessment The assessment of the applicants will be made by: Professor Erik V. Thomsen and Professor Jørgen Arendt Jensen. We offer We offer an interesting and challenging job in an international environment focusing on education, research, public-sect

Arbejdsgiver Navn: Danmarks Tekniske Universitet

Arbejdsgiver telefonnummer: 45252525

Arbejdsgiver faxnummer: 45881799

Job kort beskrivelse:
Undervisning og forskning på universiteter og højere læreranstalter

land: Danmark

region: Hovedstaden

krævede uddannelse: Ikke angivet

Kilde til jobtilbud: AMS, Offentlige arbejdsformidlinger, Danmark

GÆLDER

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