Evaluation of null subtraction imaging and interpolation techniques for ultrasound B-mode
Agarwal, Anil
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https://hdl.handle.net/2142/104871
Description
Title
Evaluation of null subtraction imaging and interpolation techniques for ultrasound B-mode
Author(s)
Agarwal, Anil
Issue Date
2019-04-18
Director of Research (if dissertation) or Advisor (if thesis)
Oelze, Michael L.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
ultrasound imaging
beamforming
apodization
null subtraction imaging
interpolation
Abstract
In biomedical ultrasound imaging, many attempts have been made to improve the lateral resolution through various adaptive and non-adaptive techniques. While each technique has its advantages and disadvantages, there are some challenges common to all methods. In particular, improvements in lateral resolution are often accompanied by a reduction in contrast, and while the -6 dB beamwidth calculated from the point-spread function may be much smaller than that of conventional techniques, these methods often do not perform as well on the Sparrow test for resolution. Another challenge presented by high-resolution techniques is related to the limited lateral sampling of ultrasound data. Conventional techniques for upsampling and interpolating the data have demonstrated limited success. This study focuses on evaluating one particular super-resolution method, null subtraction imaging, under these conditions while also demonstrating methods to overcome the challenges previously encountered with this method.
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