Image Reconstruction for Multistatic Stepped Frequency-Modulated Continuous Wave (FMCW) Ultrasound Imaging Systems With Reconfigurable Arrays
- Degree Grantor:
- University of California, Santa Barbara. Electrical and Computer Engineering
- Degree Supervisor:
- Michael Liebling
- Place of Publication:
- [Santa Barbara, Calif.]
- Publisher:
- University of California, Santa Barbara
- Creation Date:
- 2015
- Issued Date:
- 2015
- Topics:
- Engineering, Biomedical and Engineering, Electronics and Electrical
- Keywords:
- Multistatic,
Reconfigurable array,
FMCW, and
Ultrasound - Genres:
- Online resources and Dissertations, Academic
- Dissertation:
- Ph.D.--University of California, Santa Barbara, 2015
- Description:
The standard architecture of a medical ultrasound transducer is a linear phased array of piezoelectric elements in a compact, hand-held form. Acoustic energy not directly reflected back towards the transducer elements during a transmit-receive cycle amounts to lost information for image reconstruction. To mitigate this loss, a large, flexible transducer array which conforms to contours of the subject's body would result in a greater effective aperture and an increase in received image data. However, in this reconfigurable array design, element distributions are irregular and an organized arrangement can no longer be assumed. Phased array architecture also has limited scalability potential for large 2D arrays.
This research work investigates a multistatic, stepped-FMCW modality as an alternative to array phasing in order to accommodate the flexible and reconfigurable nature of an array. A space-time reconstruction algorithm was developed for the imaging system. We include ultrasound imaging experiments and describe a simulation method for quickly predicting imaging performance for any given target and array configuration. Lastly, we demonstrate two reconstruction techniques for improving image resolution. The first takes advantage of the statistical significance of pixel contributions prior to the final summation, and the second corrects data errors originating from the stepped-FMCW quadrature receiver.
- Physical Description:
- 1 online resource (198 pages)
- Format:
- Text
- Collection(s):
- UCSB electronic theses and dissertations
- Other Versions:
- http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3689946
- ARK:
- ark:/48907/f32n50fp
- ISBN:
- 9781321696394
- Catalog System Number:
- 990045119470203776
- Copyright:
- Michael Lee, 2015
- Rights:
- In Copyright
- Copyright Holder:
- Michael Lee
File | Description |
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Access: Public access | |
Lee_ucsb_0035D_12410.pdf | pdf (Portable Document Format) |