Instantaneous Frequency Image

Detalhes bibliográficos
Autor(a) principal: Prado, Vander Teixeira
Data de Publicação: 2021
Outros Autores: Higuti, Ricardo Tokio [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1109/TUFFC.2021.3051496
http://hdl.handle.net/11449/208331
Resumo: The instantaneous frequency (IF) image is proposed in this work. It is obtained by the differentiation of the instantaneous phase (IP) image, which in turn is calculated by replacing the amplitude information with the IP in the delay-and-sum beamforming. The IP image is a coherence factor that reduces artifacts and sidelobes influence, and it will be shown that the IF image will keep these same positive characteristics. In amplitude images the reflector representation level varies according to the experimental conditions, even using time-gain compensation. In IP images, the reflector is represented by a - π to π rad variation. An important feature of the IF image is that a reflector is represented by a constant level that is determined by the central frequency of the signal. Farther reflectors are represented with similar magnitudes as closer ones, being less influenced by distance than IP images and resulting in better contrast. Amplitude, IP, and IF images are obtained from point spread function simulations and a medical phantom in different experimental cases: vertical distances, contrast reflectors, axial and lateral separation, and a sparse array. The improper choice of dynamic range can result in low contrast or nondetection of a reflector. For the IF image, the dynamic range is determined by the central frequency of the signal and the zero-mean Gaussian distribution of the IF of noise. The IF image can be used to improve reflector detection, as additional information to assist the interpretation of pixels intensities in conventional amplitude images, or as a new coherence factor.
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spelling Instantaneous Frequency ImageArraysdynamic rangeinstantaneous frequency (IF)instantaneous phase (IP)ultrasonic imageThe instantaneous frequency (IF) image is proposed in this work. It is obtained by the differentiation of the instantaneous phase (IP) image, which in turn is calculated by replacing the amplitude information with the IP in the delay-and-sum beamforming. The IP image is a coherence factor that reduces artifacts and sidelobes influence, and it will be shown that the IF image will keep these same positive characteristics. In amplitude images the reflector representation level varies according to the experimental conditions, even using time-gain compensation. In IP images, the reflector is represented by a - π to π rad variation. An important feature of the IF image is that a reflector is represented by a constant level that is determined by the central frequency of the signal. Farther reflectors are represented with similar magnitudes as closer ones, being less influenced by distance than IP images and resulting in better contrast. Amplitude, IP, and IF images are obtained from point spread function simulations and a medical phantom in different experimental cases: vertical distances, contrast reflectors, axial and lateral separation, and a sparse array. The improper choice of dynamic range can result in low contrast or nondetection of a reflector. For the IF image, the dynamic range is determined by the central frequency of the signal and the zero-mean Gaussian distribution of the IF of noise. The IF image can be used to improve reflector detection, as additional information to assist the interpretation of pixels intensities in conventional amplitude images, or as a new coherence factor.Department of Electrical Engineering Universidade Tecnológica Federal Do Paraná (UTFPR)Faculty of Engineering Campus of Ilha Solteira Universidade Estadual Paulista (Unesp)Faculty of Engineering Campus of Ilha Solteira Universidade Estadual Paulista (Unesp)Universidade Tecnológica Federal Do Paraná (UTFPR)Universidade Estadual Paulista (Unesp)Prado, Vander TeixeiraHiguti, Ricardo Tokio [UNESP]2021-06-25T11:10:25Z2021-06-25T11:10:25Z2021-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1729-1741http://dx.doi.org/10.1109/TUFFC.2021.3051496IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, v. 68, n. 5, p. 1729-1741, 2021.1525-89550885-3010http://hdl.handle.net/11449/20833110.1109/TUFFC.2021.30514962-s2.0-85099568009Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Controlinfo:eu-repo/semantics/openAccess2024-07-04T19:06:35Zoai:repositorio.unesp.br:11449/208331Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:21:45.408134Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Instantaneous Frequency Image
title Instantaneous Frequency Image
spellingShingle Instantaneous Frequency Image
Prado, Vander Teixeira
Arrays
dynamic range
instantaneous frequency (IF)
instantaneous phase (IP)
ultrasonic image
title_short Instantaneous Frequency Image
title_full Instantaneous Frequency Image
title_fullStr Instantaneous Frequency Image
title_full_unstemmed Instantaneous Frequency Image
title_sort Instantaneous Frequency Image
author Prado, Vander Teixeira
author_facet Prado, Vander Teixeira
Higuti, Ricardo Tokio [UNESP]
author_role author
author2 Higuti, Ricardo Tokio [UNESP]
author2_role author
dc.contributor.none.fl_str_mv Universidade Tecnológica Federal Do Paraná (UTFPR)
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Prado, Vander Teixeira
Higuti, Ricardo Tokio [UNESP]
dc.subject.por.fl_str_mv Arrays
dynamic range
instantaneous frequency (IF)
instantaneous phase (IP)
ultrasonic image
topic Arrays
dynamic range
instantaneous frequency (IF)
instantaneous phase (IP)
ultrasonic image
description The instantaneous frequency (IF) image is proposed in this work. It is obtained by the differentiation of the instantaneous phase (IP) image, which in turn is calculated by replacing the amplitude information with the IP in the delay-and-sum beamforming. The IP image is a coherence factor that reduces artifacts and sidelobes influence, and it will be shown that the IF image will keep these same positive characteristics. In amplitude images the reflector representation level varies according to the experimental conditions, even using time-gain compensation. In IP images, the reflector is represented by a - π to π rad variation. An important feature of the IF image is that a reflector is represented by a constant level that is determined by the central frequency of the signal. Farther reflectors are represented with similar magnitudes as closer ones, being less influenced by distance than IP images and resulting in better contrast. Amplitude, IP, and IF images are obtained from point spread function simulations and a medical phantom in different experimental cases: vertical distances, contrast reflectors, axial and lateral separation, and a sparse array. The improper choice of dynamic range can result in low contrast or nondetection of a reflector. For the IF image, the dynamic range is determined by the central frequency of the signal and the zero-mean Gaussian distribution of the IF of noise. The IF image can be used to improve reflector detection, as additional information to assist the interpretation of pixels intensities in conventional amplitude images, or as a new coherence factor.
publishDate 2021
dc.date.none.fl_str_mv 2021-06-25T11:10:25Z
2021-06-25T11:10:25Z
2021-05-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1109/TUFFC.2021.3051496
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, v. 68, n. 5, p. 1729-1741, 2021.
1525-8955
0885-3010
http://hdl.handle.net/11449/208331
10.1109/TUFFC.2021.3051496
2-s2.0-85099568009
url http://dx.doi.org/10.1109/TUFFC.2021.3051496
http://hdl.handle.net/11449/208331
identifier_str_mv IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, v. 68, n. 5, p. 1729-1741, 2021.
1525-8955
0885-3010
10.1109/TUFFC.2021.3051496
2-s2.0-85099568009
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1729-1741
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1808129192412315648