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Effectiveness of synthetic aperture focusing and coherence factor weighting for intravascular ultrasound imaging

Title
Effectiveness of synthetic aperture focusing and coherence factor weighting for intravascular ultrasound imaging
Authors
Kang, SungwooLee, JunsuChang, Jin Ho
DGIST Authors
Kang, Sungwoo; Lee, Junsu; Chang, Jin Ho
Issue Date
2021-05
Citation
Ultrasonics, 113, 106364
Type
Article
Author Keywords
Intravascular Ultrasound (IVUS) imagingHigh frequency transducerSynthetic aperture focusingCoherence factorUltrasonic imaging
ISSN
0041-624X
Abstract
Synthetic aperture focusing (SAF) and coherence factor weighting (CFW) have been used to improve the lateral resolution of ultrasound images. Although the two methods are effective for array-based ultrasound imaging, many researchers have also employed the methods for single-element-based imaging including intravascular ultrasound (IVUS) imaging. For single-element-based imaging, CFW is generally calculated from the scanlines obtained by SAF and applied to the scanline obtained after coherent summation of the SAF delayed scanlines, which is called a SAF-CFW method. In the paper, a theoretical model was derived to explore the effectiveness of SAF and CFW for single-element-based imaging, and the model was used to explain that SAF is not effective for IVUS imaging in terms of enhancing the spatial resolution, although it has the advantage of improving a contrast-to-noise ratio (CNR). This means that the SAF-CFW method is not optimal for improving the spatial resolution of IVUS imaging. In contrast, it was found in simulations and experiments that applying CFW to the target scanline itself is beneficial for the spatial resolution rather than a coherent summed scanline for IVUS SAF imaging, but CNR was not as good as SAF and SAF-CFW. As a result of both simulation and experimentation, it could be concluded that focused IVUS transducers without the application of those methods may be more advantageous to improve the spatial and contrast resolution simultaneously, considering the system complexity in the implementation of such imaging methods. © 2021 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/13486
DOI
10.1016/j.ultras.2021.106364
Publisher
Elsevier BV
Related Researcher
  • Author Chang, Jin Ho Medical Acoustic Fusion Innovation Lab.
  • Research Interests Biomedical Imaging, Signal and Image Processing, Ultrasound Imaging System, Ultrasound Transducer, Photoacoustic Imaging
Files:
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Collection:
Department of Electrical Engineering and Computer ScienceMedical Acoustic Fusion Innovation Lab.1. Journal Articles


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